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functions.php (253122B)

---

 <?php
 /**
  * Main WordPress API
  *
  * @package WordPress
  */
 
 require ABSPATH . WPINC . '/option.php';
 
 /**
  * Convert given MySQL date string into a different format.
  *
  * `$format` should be a PHP date format string.
  * 'U' and 'G' formats will return a sum of timestamp with timezone offset.
  * `$date` is expected to be local time in MySQL format (`Y-m-d H:i:s`).
  *
  * Historically UTC time could be passed to the function to produce Unix timestamp.
  *
  * If `$translate` is true then the given date and format string will
  * be passed to `wp_date()` for translation.
  *
  * @since 0.71
  *
  * @param string $format    Format of the date to return.
  * @param string $date      Date string to convert.
  * @param bool   $translate Whether the return date should be translated. Default true.
  * @return string|int|false Formatted date string or sum of Unix timestamp and timezone offset.
  *                          False on failure.
  */
 function mysql2date( $format, $date, $translate = true ) {
 	if ( empty( $date ) ) {
 		return false;
 	}
 
 	$datetime = date_create( $date, wp_timezone() );
 
 	if ( false === $datetime ) {
 		return false;
 	}
 
 	// Returns a sum of timestamp with timezone offset. Ideally should never be used.
 	if ( 'G' === $format || 'U' === $format ) {
 		return $datetime->getTimestamp() + $datetime->getOffset();
 	}
 
 	if ( $translate ) {
 		return wp_date( $format, $datetime->getTimestamp() );
 	}
 
 	return $datetime->format( $format );
 }
 
 /**
  * Retrieves the current time based on specified type.
  *
  * The 'mysql' type will return the time in the format for MySQL DATETIME field.
  * The 'timestamp' type will return the current timestamp or a sum of timestamp
  * and timezone offset, depending on `$gmt`.
  * Other strings will be interpreted as PHP date formats (e.g. 'Y-m-d').
  *
  * If $gmt is set to either '1' or 'true', then both types will use GMT time.
  * if $gmt is false, the output is adjusted with the GMT offset in the WordPress option.
  *
  * @since 1.0.0
  *
  * @param string   $type Type of time to retrieve. Accepts 'mysql', 'timestamp',
  *                       or PHP date format string (e.g. 'Y-m-d').
  * @param int|bool $gmt  Optional. Whether to use GMT timezone. Default false.
  * @return int|string Integer if $type is 'timestamp', string otherwise.
  */
 function current_time( $type, $gmt = 0 ) {
 	// Don't use non-GMT timestamp, unless you know the difference and really need to.
 	if ( 'timestamp' === $type || 'U' === $type ) {
 		return $gmt ? time() : time() + (int) ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
 	}
 
 	if ( 'mysql' === $type ) {
 		$type = 'Y-m-d H:i:s';
 	}
 
 	$timezone = $gmt ? new DateTimeZone( 'UTC' ) : wp_timezone();
 	$datetime = new DateTime( 'now', $timezone );
 
 	return $datetime->format( $type );
 }
 
 /**
  * Retrieves the current time as an object with the timezone from settings.
  *
  * @since 5.3.0
  *
  * @return DateTimeImmutable Date and time object.
  */
 function current_datetime() {
 	return new DateTimeImmutable( 'now', wp_timezone() );
 }
 
 /**
  * Retrieves the timezone from site settings as a string.
  *
  * Uses the `timezone_string` option to get a proper timezone if available,
  * otherwise falls back to an offset.
  *
  * @since 5.3.0
  *
  * @return string PHP timezone string or a ±HH:MM offset.
  */
 function wp_timezone_string() {
 	$timezone_string = get_option( 'timezone_string' );
 
 	if ( $timezone_string ) {
 		return $timezone_string;
 	}
 
 	$offset  = (float) get_option( 'gmt_offset' );
 	$hours   = (int) $offset;
 	$minutes = ( $offset - $hours );
 
 	$sign      = ( $offset < 0 ) ? '-' : '+';
 	$abs_hour  = abs( $hours );
 	$abs_mins  = abs( $minutes * 60 );
 	$tz_offset = sprintf( '%s%02d:%02d', $sign, $abs_hour, $abs_mins );
 
 	return $tz_offset;
 }
 
 /**
  * Retrieves the timezone from site settings as a `DateTimeZone` object.
  *
  * Timezone can be based on a PHP timezone string or a ±HH:MM offset.
  *
  * @since 5.3.0
  *
  * @return DateTimeZone Timezone object.
  */
 function wp_timezone() {
 	return new DateTimeZone( wp_timezone_string() );
 }
 
 /**
  * Retrieves the date in localized format, based on a sum of Unix timestamp and
  * timezone offset in seconds.
  *
  * If the locale specifies the locale month and weekday, then the locale will
  * take over the format for the date. If it isn't, then the date format string
  * will be used instead.
  *
  * Note that due to the way WP typically generates a sum of timestamp and offset
  * with `strtotime()`, it implies offset added at a _current_ time, not at the time
  * the timestamp represents. Storing such timestamps or calculating them differently
  * will lead to invalid output.
  *
  * @since 0.71
  * @since 5.3.0 Converted into a wrapper for wp_date().
  *
  * @global WP_Locale $wp_locale WordPress date and time locale object.
  *
  * @param string   $format                Format to display the date.
  * @param int|bool $timestamp_with_offset Optional. A sum of Unix timestamp and timezone offset
  *                                        in seconds. Default false.
  * @param bool     $gmt                   Optional. Whether to use GMT timezone. Only applies
  *                                        if timestamp is not provided. Default false.
  * @return string The date, translated if locale specifies it.
  */
 function date_i18n( $format, $timestamp_with_offset = false, $gmt = false ) {
 	$timestamp = $timestamp_with_offset;
 
 	// If timestamp is omitted it should be current time (summed with offset, unless `$gmt` is true).
 	if ( ! is_numeric( $timestamp ) ) {
 		$timestamp = current_time( 'timestamp', $gmt );
 	}
 
 	/*
 	 * This is a legacy implementation quirk that the returned timestamp is also with offset.
 	 * Ideally this function should never be used to produce a timestamp.
 	 */
 	if ( 'U' === $format ) {
 		$date = $timestamp;
 	} elseif ( $gmt && false === $timestamp_with_offset ) { // Current time in UTC.
 		$date = wp_date( $format, null, new DateTimeZone( 'UTC' ) );
 	} elseif ( false === $timestamp_with_offset ) { // Current time in site's timezone.
 		$date = wp_date( $format );
 	} else {
 		/*
 		 * Timestamp with offset is typically produced by a UTC `strtotime()` call on an input without timezone.
 		 * This is the best attempt to reverse that operation into a local time to use.
 		 */
 		$local_time = gmdate( 'Y-m-d H:i:s', $timestamp );
 		$timezone   = wp_timezone();
 		$datetime   = date_create( $local_time, $timezone );
 		$date       = wp_date( $format, $datetime->getTimestamp(), $timezone );
 	}
 
 	/**
 	 * Filters the date formatted based on the locale.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param string $date      Formatted date string.
 	 * @param string $format    Format to display the date.
 	 * @param int    $timestamp A sum of Unix timestamp and timezone offset in seconds.
 	 *                          Might be without offset if input omitted timestamp but requested GMT.
 	 * @param bool   $gmt       Whether to use GMT timezone. Only applies if timestamp was not provided.
 	 *                          Default false.
 	 */
 	$date = apply_filters( 'date_i18n', $date, $format, $timestamp, $gmt );
 
 	return $date;
 }
 
 /**
  * Retrieves the date, in localized format.
  *
  * This is a newer function, intended to replace `date_i18n()` without legacy quirks in it.
  *
  * Note that, unlike `date_i18n()`, this function accepts a true Unix timestamp, not summed
  * with timezone offset.
  *
  * @since 5.3.0
  *
  * @param string       $format    PHP date format.
  * @param int          $timestamp Optional. Unix timestamp. Defaults to current time.
  * @param DateTimeZone $timezone  Optional. Timezone to output result in. Defaults to timezone
  *                                from site settings.
  * @return string|false The date, translated if locale specifies it. False on invalid timestamp input.
  */
 function wp_date( $format, $timestamp = null, $timezone = null ) {
 	global $wp_locale;
 
 	if ( null === $timestamp ) {
 		$timestamp = time();
 	} elseif ( ! is_numeric( $timestamp ) ) {
 		return false;
 	}
 
 	if ( ! $timezone ) {
 		$timezone = wp_timezone();
 	}
 
 	$datetime = date_create( '@' . $timestamp );
 	$datetime->setTimezone( $timezone );
 
 	if ( empty( $wp_locale->month ) || empty( $wp_locale->weekday ) ) {
 		$date = $datetime->format( $format );
 	} else {
 		// We need to unpack shorthand `r` format because it has parts that might be localized.
 		$format = preg_replace( '/(?<!\\\\)r/', DATE_RFC2822, $format );
 
 		$new_format    = '';
 		$format_length = strlen( $format );
 		$month         = $wp_locale->get_month( $datetime->format( 'm' ) );
 		$weekday       = $wp_locale->get_weekday( $datetime->format( 'w' ) );
 
 		for ( $i = 0; $i < $format_length; $i ++ ) {
 			switch ( $format[ $i ] ) {
 				case 'D':
 					$new_format .= addcslashes( $wp_locale->get_weekday_abbrev( $weekday ), '\\A..Za..z' );
 					break;
 				case 'F':
 					$new_format .= addcslashes( $month, '\\A..Za..z' );
 					break;
 				case 'l':
 					$new_format .= addcslashes( $weekday, '\\A..Za..z' );
 					break;
 				case 'M':
 					$new_format .= addcslashes( $wp_locale->get_month_abbrev( $month ), '\\A..Za..z' );
 					break;
 				case 'a':
 					$new_format .= addcslashes( $wp_locale->get_meridiem( $datetime->format( 'a' ) ), '\\A..Za..z' );
 					break;
 				case 'A':
 					$new_format .= addcslashes( $wp_locale->get_meridiem( $datetime->format( 'A' ) ), '\\A..Za..z' );
 					break;
 				case '\\':
 					$new_format .= $format[ $i ];
 
 					// If character follows a slash, we add it without translating.
 					if ( $i < $format_length ) {
 						$new_format .= $format[ ++$i ];
 					}
 					break;
 				default:
 					$new_format .= $format[ $i ];
 					break;
 			}
 		}
 
 		$date = $datetime->format( $new_format );
 		$date = wp_maybe_decline_date( $date, $format );
 	}
 
 	/**
 	 * Filters the date formatted based on the locale.
 	 *
 	 * @since 5.3.0
 	 *
 	 * @param string       $date      Formatted date string.
 	 * @param string       $format    Format to display the date.
 	 * @param int          $timestamp Unix timestamp.
 	 * @param DateTimeZone $timezone  Timezone.
 	 */
 	$date = apply_filters( 'wp_date', $date, $format, $timestamp, $timezone );
 
 	return $date;
 }
 
 /**
  * Determines if the date should be declined.
  *
  * If the locale specifies that month names require a genitive case in certain
  * formats (like 'j F Y'), the month name will be replaced with a correct form.
  *
  * @since 4.4.0
  * @since 5.4.0 The `$format` parameter was added.
  *
  * @global WP_Locale $wp_locale WordPress date and time locale object.
  *
  * @param string $date   Formatted date string.
  * @param string $format Optional. Date format to check. Default empty string.
  * @return string The date, declined if locale specifies it.
  */
 function wp_maybe_decline_date( $date, $format = '' ) {
 	global $wp_locale;
 
 	// i18n functions are not available in SHORTINIT mode.
 	if ( ! function_exists( '_x' ) ) {
 		return $date;
 	}
 
 	/*
 	 * translators: If months in your language require a genitive case,
 	 * translate this to 'on'. Do not translate into your own language.
 	 */
 	if ( 'on' === _x( 'off', 'decline months names: on or off' ) ) {
 
 		$months          = $wp_locale->month;
 		$months_genitive = $wp_locale->month_genitive;
 
 		/*
 		 * Match a format like 'j F Y' or 'j. F' (day of the month, followed by month name)
 		 * and decline the month.
 		 */
 		if ( $format ) {
 			$decline = preg_match( '#[dj]\.? F#', $format );
 		} else {
 			// If the format is not passed, try to guess it from the date string.
 			$decline = preg_match( '#\b\d{1,2}\.? [^\d ]+\b#u', $date );
 		}
 
 		if ( $decline ) {
 			foreach ( $months as $key => $month ) {
 				$months[ $key ] = '# ' . preg_quote( $month, '#' ) . '\b#u';
 			}
 
 			foreach ( $months_genitive as $key => $month ) {
 				$months_genitive[ $key ] = ' ' . $month;
 			}
 
 			$date = preg_replace( $months, $months_genitive, $date );
 		}
 
 		/*
 		 * Match a format like 'F jS' or 'F j' (month name, followed by day with an optional ordinal suffix)
 		 * and change it to declined 'j F'.
 		 */
 		if ( $format ) {
 			$decline = preg_match( '#F [dj]#', $format );
 		} else {
 			// If the format is not passed, try to guess it from the date string.
 			$decline = preg_match( '#\b[^\d ]+ \d{1,2}(st|nd|rd|th)?\b#u', trim( $date ) );
 		}
 
 		if ( $decline ) {
 			foreach ( $months as $key => $month ) {
 				$months[ $key ] = '#\b' . preg_quote( $month, '#' ) . ' (\d{1,2})(st|nd|rd|th)?([-–]\d{1,2})?(st|nd|rd|th)?\b#u';
 			}
 
 			foreach ( $months_genitive as $key => $month ) {
 				$months_genitive[ $key ] = '$1$3 ' . $month;
 			}
 
 			$date = preg_replace( $months, $months_genitive, $date );
 		}
 	}
 
 	// Used for locale-specific rules.
 	$locale = get_locale();
 
 	if ( 'ca' === $locale ) {
 		// " de abril| de agost| de octubre..." -> " d'abril| d'agost| d'octubre..."
 		$date = preg_replace( '# de ([ao])#i', " d'\\1", $date );
 	}
 
 	return $date;
 }
 
 /**
  * Convert float number to format based on the locale.
  *
  * @since 2.3.0
  *
  * @global WP_Locale $wp_locale WordPress date and time locale object.
  *
  * @param float $number   The number to convert based on locale.
  * @param int   $decimals Optional. Precision of the number of decimal places. Default 0.
  * @return string Converted number in string format.
  */
 function number_format_i18n( $number, $decimals = 0 ) {
 	global $wp_locale;
 
 	if ( isset( $wp_locale ) ) {
 		$formatted = number_format( $number, absint( $decimals ), $wp_locale->number_format['decimal_point'], $wp_locale->number_format['thousands_sep'] );
 	} else {
 		$formatted = number_format( $number, absint( $decimals ) );
 	}
 
 	/**
 	 * Filters the number formatted based on the locale.
 	 *
 	 * @since 2.8.0
 	 * @since 4.9.0 The `$number` and `$decimals` parameters were added.
 	 *
 	 * @param string $formatted Converted number in string format.
 	 * @param float  $number    The number to convert based on locale.
 	 * @param int    $decimals  Precision of the number of decimal places.
 	 */
 	return apply_filters( 'number_format_i18n', $formatted, $number, $decimals );
 }
 
 /**
  * Convert number of bytes largest unit bytes will fit into.
  *
  * It is easier to read 1 KB than 1024 bytes and 1 MB than 1048576 bytes. Converts
  * number of bytes to human readable number by taking the number of that unit
  * that the bytes will go into it. Supports TB value.
  *
  * Please note that integers in PHP are limited to 32 bits, unless they are on
  * 64 bit architecture, then they have 64 bit size. If you need to place the
  * larger size then what PHP integer type will hold, then use a string. It will
  * be converted to a double, which should always have 64 bit length.
  *
  * Technically the correct unit names for powers of 1024 are KiB, MiB etc.
  *
  * @since 2.3.0
  *
  * @param int|string $bytes    Number of bytes. Note max integer size for integers.
  * @param int        $decimals Optional. Precision of number of decimal places. Default 0.
  * @return string|false Number string on success, false on failure.
  */
 function size_format( $bytes, $decimals = 0 ) {
 	$quant = array(
 		/* translators: Unit symbol for terabyte. */
 		_x( 'TB', 'unit symbol' ) => TB_IN_BYTES,
 		/* translators: Unit symbol for gigabyte. */
 		_x( 'GB', 'unit symbol' ) => GB_IN_BYTES,
 		/* translators: Unit symbol for megabyte. */
 		_x( 'MB', 'unit symbol' ) => MB_IN_BYTES,
 		/* translators: Unit symbol for kilobyte. */
 		_x( 'KB', 'unit symbol' ) => KB_IN_BYTES,
 		/* translators: Unit symbol for byte. */
 		_x( 'B', 'unit symbol' )  => 1,
 	);
 
 	if ( 0 === $bytes ) {
 		/* translators: Unit symbol for byte. */
 		return number_format_i18n( 0, $decimals ) . ' ' . _x( 'B', 'unit symbol' );
 	}
 
 	foreach ( $quant as $unit => $mag ) {
 		if ( (float) $bytes >= $mag ) {
 			return number_format_i18n( $bytes / $mag, $decimals ) . ' ' . $unit;
 		}
 	}
 
 	return false;
 }
 
 /**
  * Convert a duration to human readable format.
  *
  * @since 5.1.0
  *
  * @param string $duration Duration will be in string format (HH:ii:ss) OR (ii:ss),
  *                         with a possible prepended negative sign (-).
  * @return string|false A human readable duration string, false on failure.
  */
 function human_readable_duration( $duration = '' ) {
 	if ( ( empty( $duration ) || ! is_string( $duration ) ) ) {
 		return false;
 	}
 
 	$duration = trim( $duration );
 
 	// Remove prepended negative sign.
 	if ( '-' === substr( $duration, 0, 1 ) ) {
 		$duration = substr( $duration, 1 );
 	}
 
 	// Extract duration parts.
 	$duration_parts = array_reverse( explode( ':', $duration ) );
 	$duration_count = count( $duration_parts );
 
 	$hour   = null;
 	$minute = null;
 	$second = null;
 
 	if ( 3 === $duration_count ) {
 		// Validate HH:ii:ss duration format.
 		if ( ! ( (bool) preg_match( '/^([0-9]+):([0-5]?[0-9]):([0-5]?[0-9])$/', $duration ) ) ) {
 			return false;
 		}
 		// Three parts: hours, minutes & seconds.
 		list( $second, $minute, $hour ) = $duration_parts;
 	} elseif ( 2 === $duration_count ) {
 		// Validate ii:ss duration format.
 		if ( ! ( (bool) preg_match( '/^([0-5]?[0-9]):([0-5]?[0-9])$/', $duration ) ) ) {
 			return false;
 		}
 		// Two parts: minutes & seconds.
 		list( $second, $minute ) = $duration_parts;
 	} else {
 		return false;
 	}
 
 	$human_readable_duration = array();
 
 	// Add the hour part to the string.
 	if ( is_numeric( $hour ) ) {
 		/* translators: %s: Time duration in hour or hours. */
 		$human_readable_duration[] = sprintf( _n( '%s hour', '%s hours', $hour ), (int) $hour );
 	}
 
 	// Add the minute part to the string.
 	if ( is_numeric( $minute ) ) {
 		/* translators: %s: Time duration in minute or minutes. */
 		$human_readable_duration[] = sprintf( _n( '%s minute', '%s minutes', $minute ), (int) $minute );
 	}
 
 	// Add the second part to the string.
 	if ( is_numeric( $second ) ) {
 		/* translators: %s: Time duration in second or seconds. */
 		$human_readable_duration[] = sprintf( _n( '%s second', '%s seconds', $second ), (int) $second );
 	}
 
 	return implode( ', ', $human_readable_duration );
 }
 
 /**
  * Get the week start and end from the datetime or date string from MySQL.
  *
  * @since 0.71
  *
  * @param string     $mysqlstring   Date or datetime field type from MySQL.
  * @param int|string $start_of_week Optional. Start of the week as an integer. Default empty string.
  * @return array Keys are 'start' and 'end'.
  */
 function get_weekstartend( $mysqlstring, $start_of_week = '' ) {
 	// MySQL string year.
 	$my = substr( $mysqlstring, 0, 4 );
 
 	// MySQL string month.
 	$mm = substr( $mysqlstring, 8, 2 );
 
 	// MySQL string day.
 	$md = substr( $mysqlstring, 5, 2 );
 
 	// The timestamp for MySQL string day.
 	$day = mktime( 0, 0, 0, $md, $mm, $my );
 
 	// The day of the week from the timestamp.
 	$weekday = gmdate( 'w', $day );
 
 	if ( ! is_numeric( $start_of_week ) ) {
 		$start_of_week = get_option( 'start_of_week' );
 	}
 
 	if ( $weekday < $start_of_week ) {
 		$weekday += 7;
 	}
 
 	// The most recent week start day on or before $day.
 	$start = $day - DAY_IN_SECONDS * ( $weekday - $start_of_week );
 
 	// $start + 1 week - 1 second.
 	$end = $start + WEEK_IN_SECONDS - 1;
 	return compact( 'start', 'end' );
 }
 
 /**
  * Serialize data, if needed.
  *
  * @since 2.0.5
  *
  * @param string|array|object $data Data that might be serialized.
  * @return mixed A scalar data.
  */
 function maybe_serialize( $data ) {
 	if ( is_array( $data ) || is_object( $data ) ) {
 		return serialize( $data );
 	}
 
 	/*
 	 * Double serialization is required for backward compatibility.
 	 * See https://core.trac.wordpress.org/ticket/12930
 	 * Also the world will end. See WP 3.6.1.
 	 */
 	if ( is_serialized( $data, false ) ) {
 		return serialize( $data );
 	}
 
 	return $data;
 }
 
 /**
  * Unserialize data only if it was serialized.
  *
  * @since 2.0.0
  *
  * @param string $data Data that might be unserialized.
  * @return mixed Unserialized data can be any type.
  */
 function maybe_unserialize( $data ) {
 	if ( is_serialized( $data ) ) { // Don't attempt to unserialize data that wasn't serialized going in.
 		return @unserialize( trim( $data ) );
 	}
 
 	return $data;
 }
 
 /**
  * Check value to find if it was serialized.
  *
  * If $data is not an string, then returned value will always be false.
  * Serialized data is always a string.
  *
  * @since 2.0.5
  *
  * @param string $data   Value to check to see if was serialized.
  * @param bool   $strict Optional. Whether to be strict about the end of the string. Default true.
  * @return bool False if not serialized and true if it was.
  */
 function is_serialized( $data, $strict = true ) {
 	// If it isn't a string, it isn't serialized.
 	if ( ! is_string( $data ) ) {
 		return false;
 	}
 	$data = trim( $data );
 	if ( 'N;' === $data ) {
 		return true;
 	}
 	if ( strlen( $data ) < 4 ) {
 		return false;
 	}
 	if ( ':' !== $data[1] ) {
 		return false;
 	}
 	if ( $strict ) {
 		$lastc = substr( $data, -1 );
 		if ( ';' !== $lastc && '}' !== $lastc ) {
 			return false;
 		}
 	} else {
 		$semicolon = strpos( $data, ';' );
 		$brace     = strpos( $data, '}' );
 		// Either ; or } must exist.
 		if ( false === $semicolon && false === $brace ) {
 			return false;
 		}
 		// But neither must be in the first X characters.
 		if ( false !== $semicolon && $semicolon < 3 ) {
 			return false;
 		}
 		if ( false !== $brace && $brace < 4 ) {
 			return false;
 		}
 	}
 	$token = $data[0];
 	switch ( $token ) {
 		case 's':
 			if ( $strict ) {
 				if ( '"' !== substr( $data, -2, 1 ) ) {
 					return false;
 				}
 			} elseif ( false === strpos( $data, '"' ) ) {
 				return false;
 			}
 			// Or else fall through.
 		case 'a':
 		case 'O':
 			return (bool) preg_match( "/^{$token}:[0-9]+:/s", $data );
 		case 'b':
 		case 'i':
 		case 'd':
 			$end = $strict ? '$' : '';
 			return (bool) preg_match( "/^{$token}:[0-9.E+-]+;$end/", $data );
 	}
 	return false;
 }
 
 /**
  * Check whether serialized data is of string type.
  *
  * @since 2.0.5
  *
  * @param string $data Serialized data.
  * @return bool False if not a serialized string, true if it is.
  */
 function is_serialized_string( $data ) {
 	// if it isn't a string, it isn't a serialized string.
 	if ( ! is_string( $data ) ) {
 		return false;
 	}
 	$data = trim( $data );
 	if ( strlen( $data ) < 4 ) {
 		return false;
 	} elseif ( ':' !== $data[1] ) {
 		return false;
 	} elseif ( ';' !== substr( $data, -1 ) ) {
 		return false;
 	} elseif ( 's' !== $data[0] ) {
 		return false;
 	} elseif ( '"' !== substr( $data, -2, 1 ) ) {
 		return false;
 	} else {
 		return true;
 	}
 }
 
 /**
  * Retrieve post title from XMLRPC XML.
  *
  * If the title element is not part of the XML, then the default post title from
  * the $post_default_title will be used instead.
  *
  * @since 0.71
  *
  * @global string $post_default_title Default XML-RPC post title.
  *
  * @param string $content XMLRPC XML Request content
  * @return string Post title
  */
 function xmlrpc_getposttitle( $content ) {
 	global $post_default_title;
 	if ( preg_match( '/<title>(.+?)<\/title>/is', $content, $matchtitle ) ) {
 		$post_title = $matchtitle[1];
 	} else {
 		$post_title = $post_default_title;
 	}
 	return $post_title;
 }
 
 /**
  * Retrieve the post category or categories from XMLRPC XML.
  *
  * If the category element is not found, then the default post category will be
  * used. The return type then would be what $post_default_category. If the
  * category is found, then it will always be an array.
  *
  * @since 0.71
  *
  * @global string $post_default_category Default XML-RPC post category.
  *
  * @param string $content XMLRPC XML Request content
  * @return string|array List of categories or category name.
  */
 function xmlrpc_getpostcategory( $content ) {
 	global $post_default_category;
 	if ( preg_match( '/<category>(.+?)<\/category>/is', $content, $matchcat ) ) {
 		$post_category = trim( $matchcat[1], ',' );
 		$post_category = explode( ',', $post_category );
 	} else {
 		$post_category = $post_default_category;
 	}
 	return $post_category;
 }
 
 /**
  * XMLRPC XML content without title and category elements.
  *
  * @since 0.71
  *
  * @param string $content XML-RPC XML Request content.
  * @return string XMLRPC XML Request content without title and category elements.
  */
 function xmlrpc_removepostdata( $content ) {
 	$content = preg_replace( '/<title>(.+?)<\/title>/si', '', $content );
 	$content = preg_replace( '/<category>(.+?)<\/category>/si', '', $content );
 	$content = trim( $content );
 	return $content;
 }
 
 /**
  * Use RegEx to extract URLs from arbitrary content.
  *
  * @since 3.7.0
  *
  * @param string $content Content to extract URLs from.
  * @return string[] Array of URLs found in passed string.
  */
 function wp_extract_urls( $content ) {
 	preg_match_all(
 		"#([\"']?)("
 			. '(?:([\w-]+:)?//?)'
 			. '[^\s()<>]+'
 			. '[.]'
 			. '(?:'
 				. '\([\w\d]+\)|'
 				. '(?:'
 					. "[^`!()\[\]{};:'\".,<>«»“”‘’\s]|"
 					. '(?:[:]\d+)?/?'
 				. ')+'
 			. ')'
 		. ")\\1#",
 		$content,
 		$post_links
 	);
 
 	$post_links = array_unique( array_map( 'html_entity_decode', $post_links[2] ) );
 
 	return array_values( $post_links );
 }
 
 /**
  * Check content for video and audio links to add as enclosures.
  *
  * Will not add enclosures that have already been added and will
  * remove enclosures that are no longer in the post. This is called as
  * pingbacks and trackbacks.
  *
  * @since 1.5.0
  * @since 5.3.0 The `$content` parameter was made optional, and the `$post` parameter was
  *              updated to accept a post ID or a WP_Post object.
  * @since 5.6.0 The `$content` parameter is no longer optional, but passing `null` to skip it
  *              is still supported.
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
  * @param string|null $content Post content. If `null`, the `post_content` field from `$post` is used.
  * @param int|WP_Post $post    Post ID or post object.
  * @return void|false Void on success, false if the post is not found.
  */
 function do_enclose( $content, $post ) {
 	global $wpdb;
 
 	// @todo Tidy this code and make the debug code optional.
 	include_once ABSPATH . WPINC . '/class-IXR.php';
 
 	$post = get_post( $post );
 	if ( ! $post ) {
 		return false;
 	}
 
 	if ( null === $content ) {
 		$content = $post->post_content;
 	}
 
 	$post_links = array();
 
 	$pung = get_enclosed( $post->ID );
 
 	$post_links_temp = wp_extract_urls( $content );
 
 	foreach ( $pung as $link_test ) {
 		// Link is no longer in post.
 		if ( ! in_array( $link_test, $post_links_temp, true ) ) {
 			$mids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = 'enclosure' AND meta_value LIKE %s", $post->ID, $wpdb->esc_like( $link_test ) . '%' ) );
 			foreach ( $mids as $mid ) {
 				delete_metadata_by_mid( 'post', $mid );
 			}
 		}
 	}
 
 	foreach ( (array) $post_links_temp as $link_test ) {
 		// If we haven't pung it already.
 		if ( ! in_array( $link_test, $pung, true ) ) {
 			$test = parse_url( $link_test );
 			if ( false === $test ) {
 				continue;
 			}
 			if ( isset( $test['query'] ) ) {
 				$post_links[] = $link_test;
 			} elseif ( isset( $test['path'] ) && ( '/' !== $test['path'] ) && ( '' !== $test['path'] ) ) {
 				$post_links[] = $link_test;
 			}
 		}
 	}
 
 	/**
 	 * Filters the list of enclosure links before querying the database.
 	 *
 	 * Allows for the addition and/or removal of potential enclosures to save
 	 * to postmeta before checking the database for existing enclosures.
 	 *
 	 * @since 4.4.0
 	 *
 	 * @param string[] $post_links An array of enclosure links.
 	 * @param int      $post_ID    Post ID.
 	 */
 	$post_links = apply_filters( 'enclosure_links', $post_links, $post->ID );
 
 	foreach ( (array) $post_links as $url ) {
 		$url = strip_fragment_from_url( $url );
 
 		if ( '' !== $url && ! $wpdb->get_var( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = 'enclosure' AND meta_value LIKE %s", $post->ID, $wpdb->esc_like( $url ) . '%' ) ) ) {
 
 			$headers = wp_get_http_headers( $url );
 			if ( $headers ) {
 				$len           = isset( $headers['content-length'] ) ? (int) $headers['content-length'] : 0;
 				$type          = isset( $headers['content-type'] ) ? $headers['content-type'] : '';
 				$allowed_types = array( 'video', 'audio' );
 
 				// Check to see if we can figure out the mime type from the extension.
 				$url_parts = parse_url( $url );
 				if ( false !== $url_parts && ! empty( $url_parts['path'] ) ) {
 					$extension = pathinfo( $url_parts['path'], PATHINFO_EXTENSION );
 					if ( ! empty( $extension ) ) {
 						foreach ( wp_get_mime_types() as $exts => $mime ) {
 							if ( preg_match( '!^(' . $exts . ')$!i', $extension ) ) {
 								$type = $mime;
 								break;
 							}
 						}
 					}
 				}
 
 				if ( in_array( substr( $type, 0, strpos( $type, '/' ) ), $allowed_types, true ) ) {
 					add_post_meta( $post->ID, 'enclosure', "$url\n$len\n$mime\n" );
 				}
 			}
 		}
 	}
 }
 
 /**
  * Retrieve HTTP Headers from URL.
  *
  * @since 1.5.1
  *
  * @param string $url        URL to retrieve HTTP headers from.
  * @param bool   $deprecated Not Used.
  * @return string|false Headers on success, false on failure.
  */
 function wp_get_http_headers( $url, $deprecated = false ) {
 	if ( ! empty( $deprecated ) ) {
 		_deprecated_argument( __FUNCTION__, '2.7.0' );
 	}
 
 	$response = wp_safe_remote_head( $url );
 
 	if ( is_wp_error( $response ) ) {
 		return false;
 	}
 
 	return wp_remote_retrieve_headers( $response );
 }
 
 /**
  * Determines whether the publish date of the current post in the loop is different
  * from the publish date of the previous post in the loop.
  *
  * For more information on this and similar theme functions, check out
  * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
  * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 0.71
  *
  * @global string $currentday  The day of the current post in the loop.
  * @global string $previousday The day of the previous post in the loop.
  *
  * @return int 1 when new day, 0 if not a new day.
  */
 function is_new_day() {
 	global $currentday, $previousday;
 
 	if ( $currentday !== $previousday ) {
 		return 1;
 	} else {
 		return 0;
 	}
 }
 
 /**
  * Build URL query based on an associative and, or indexed array.
  *
  * This is a convenient function for easily building url queries. It sets the
  * separator to '&' and uses _http_build_query() function.
  *
  * @since 2.3.0
  *
  * @see _http_build_query() Used to build the query
  * @link https://www.php.net/manual/en/function.http-build-query.php for more on what
  *       http_build_query() does.
  *
  * @param array $data URL-encode key/value pairs.
  * @return string URL-encoded string.
  */
 function build_query( $data ) {
 	return _http_build_query( $data, null, '&', '', false );
 }
 
 /**
  * From php.net (modified by Mark Jaquith to behave like the native PHP5 function).
  *
  * @since 3.2.0
  * @access private
  *
  * @see https://www.php.net/manual/en/function.http-build-query.php
  *
  * @param array|object $data      An array or object of data. Converted to array.
  * @param string       $prefix    Optional. Numeric index. If set, start parameter numbering with it.
  *                                Default null.
  * @param string       $sep       Optional. Argument separator; defaults to 'arg_separator.output'.
  *                                Default null.
  * @param string       $key       Optional. Used to prefix key name. Default empty.
  * @param bool         $urlencode Optional. Whether to use urlencode() in the result. Default true.
  * @return string The query string.
  */
 function _http_build_query( $data, $prefix = null, $sep = null, $key = '', $urlencode = true ) {
 	$ret = array();
 
 	foreach ( (array) $data as $k => $v ) {
 		if ( $urlencode ) {
 			$k = urlencode( $k );
 		}
 		if ( is_int( $k ) && null != $prefix ) {
 			$k = $prefix . $k;
 		}
 		if ( ! empty( $key ) ) {
 			$k = $key . '%5B' . $k . '%5D';
 		}
 		if ( null === $v ) {
 			continue;
 		} elseif ( false === $v ) {
 			$v = '0';
 		}
 
 		if ( is_array( $v ) || is_object( $v ) ) {
 			array_push( $ret, _http_build_query( $v, '', $sep, $k, $urlencode ) );
 		} elseif ( $urlencode ) {
 			array_push( $ret, $k . '=' . urlencode( $v ) );
 		} else {
 			array_push( $ret, $k . '=' . $v );
 		}
 	}
 
 	if ( null === $sep ) {
 		$sep = ini_get( 'arg_separator.output' );
 	}
 
 	return implode( $sep, $ret );
 }
 
 /**
  * Retrieves a modified URL query string.
  *
  * You can rebuild the URL and append query variables to the URL query by using this function.
  * There are two ways to use this function; either a single key and value, or an associative array.
  *
  * Using a single key and value:
  *
  *     add_query_arg( 'key', 'value', 'http://example.com' );
  *
  * Using an associative array:
  *
  *     add_query_arg( array(
  *         'key1' => 'value1',
  *         'key2' => 'value2',
  *     ), 'http://example.com' );
  *
  * Omitting the URL from either use results in the current URL being used
  * (the value of `$_SERVER['REQUEST_URI']`).
  *
  * Values are expected to be encoded appropriately with urlencode() or rawurlencode().
  *
  * Setting any query variable's value to boolean false removes the key (see remove_query_arg()).
  *
  * Important: The return value of add_query_arg() is not escaped by default. Output should be
  * late-escaped with esc_url() or similar to help prevent vulnerability to cross-site scripting
  * (XSS) attacks.
  *
  * @since 1.5.0
  * @since 5.3.0 Formalized the existing and already documented parameters
  *              by adding `...$args` to the function signature.
  *
  * @param string|array $key   Either a query variable key, or an associative array of query variables.
  * @param string       $value Optional. Either a query variable value, or a URL to act upon.
  * @param string       $url   Optional. A URL to act upon.
  * @return string New URL query string (unescaped).
  */
 function add_query_arg( ...$args ) {
 	if ( is_array( $args[0] ) ) {
 		if ( count( $args ) < 2 || false === $args[1] ) {
 			$uri = $_SERVER['REQUEST_URI'];
 		} else {
 			$uri = $args[1];
 		}
 	} else {
 		if ( count( $args ) < 3 || false === $args[2] ) {
 			$uri = $_SERVER['REQUEST_URI'];
 		} else {
 			$uri = $args[2];
 		}
 	}
 
 	$frag = strstr( $uri, '#' );
 	if ( $frag ) {
 		$uri = substr( $uri, 0, -strlen( $frag ) );
 	} else {
 		$frag = '';
 	}
 
 	if ( 0 === stripos( $uri, 'http://' ) ) {
 		$protocol = 'http://';
 		$uri      = substr( $uri, 7 );
 	} elseif ( 0 === stripos( $uri, 'https://' ) ) {
 		$protocol = 'https://';
 		$uri      = substr( $uri, 8 );
 	} else {
 		$protocol = '';
 	}
 
 	if ( strpos( $uri, '?' ) !== false ) {
 		list( $base, $query ) = explode( '?', $uri, 2 );
 		$base                .= '?';
 	} elseif ( $protocol || strpos( $uri, '=' ) === false ) {
 		$base  = $uri . '?';
 		$query = '';
 	} else {
 		$base  = '';
 		$query = $uri;
 	}
 
 	wp_parse_str( $query, $qs );
 	$qs = urlencode_deep( $qs ); // This re-URL-encodes things that were already in the query string.
 	if ( is_array( $args[0] ) ) {
 		foreach ( $args[0] as $k => $v ) {
 			$qs[ $k ] = $v;
 		}
 	} else {
 		$qs[ $args[0] ] = $args[1];
 	}
 
 	foreach ( $qs as $k => $v ) {
 		if ( false === $v ) {
 			unset( $qs[ $k ] );
 		}
 	}
 
 	$ret = build_query( $qs );
 	$ret = trim( $ret, '?' );
 	$ret = preg_replace( '#=(&|$)#', '$1', $ret );
 	$ret = $protocol . $base . $ret . $frag;
 	$ret = rtrim( $ret, '?' );
 	return $ret;
 }
 
 /**
  * Removes an item or items from a query string.
  *
  * @since 1.5.0
  *
  * @param string|string[] $key   Query key or keys to remove.
  * @param false|string    $query Optional. When false uses the current URL. Default false.
  * @return string New URL query string.
  */
 function remove_query_arg( $key, $query = false ) {
 	if ( is_array( $key ) ) { // Removing multiple keys.
 		foreach ( $key as $k ) {
 			$query = add_query_arg( $k, false, $query );
 		}
 		return $query;
 	}
 	return add_query_arg( $key, false, $query );
 }
 
 /**
  * Returns an array of single-use query variable names that can be removed from a URL.
  *
  * @since 4.4.0
  *
  * @return string[] An array of query variable names to remove from the URL.
  */
 function wp_removable_query_args() {
 	$removable_query_args = array(
 		'activate',
 		'activated',
 		'admin_email_remind_later',
 		'approved',
 		'core-major-auto-updates-saved',
 		'deactivate',
 		'delete_count',
 		'deleted',
 		'disabled',
 		'doing_wp_cron',
 		'enabled',
 		'error',
 		'hotkeys_highlight_first',
 		'hotkeys_highlight_last',
 		'ids',
 		'locked',
 		'message',
 		'same',
 		'saved',
 		'settings-updated',
 		'skipped',
 		'spammed',
 		'trashed',
 		'unspammed',
 		'untrashed',
 		'update',
 		'updated',
 		'wp-post-new-reload',
 	);
 
 	/**
 	 * Filters the list of query variable names to remove.
 	 *
 	 * @since 4.2.0
 	 *
 	 * @param string[] $removable_query_args An array of query variable names to remove from a URL.
 	 */
 	return apply_filters( 'removable_query_args', $removable_query_args );
 }
 
 /**
  * Walks the array while sanitizing the contents.
  *
  * @since 0.71
  * @since 5.5.0 Non-string values are left untouched.
  *
  * @param array $array Array to walk while sanitizing contents.
  * @return array Sanitized $array.
  */
 function add_magic_quotes( $array ) {
 	foreach ( (array) $array as $k => $v ) {
 		if ( is_array( $v ) ) {
 			$array[ $k ] = add_magic_quotes( $v );
 		} elseif ( is_string( $v ) ) {
 			$array[ $k ] = addslashes( $v );
 		} else {
 			continue;
 		}
 	}
 
 	return $array;
 }
 
 /**
  * HTTP request for URI to retrieve content.
  *
  * @since 1.5.1
  *
  * @see wp_safe_remote_get()
  *
  * @param string $uri URI/URL of web page to retrieve.
  * @return string|false HTTP content. False on failure.
  */
 function wp_remote_fopen( $uri ) {
 	$parsed_url = parse_url( $uri );
 
 	if ( ! $parsed_url || ! is_array( $parsed_url ) ) {
 		return false;
 	}
 
 	$options            = array();
 	$options['timeout'] = 10;
 
 	$response = wp_safe_remote_get( $uri, $options );
 
 	if ( is_wp_error( $response ) ) {
 		return false;
 	}
 
 	return wp_remote_retrieve_body( $response );
 }
 
 /**
  * Set up the WordPress query.
  *
  * @since 2.0.0
  *
  * @global WP       $wp           Current WordPress environment instance.
  * @global WP_Query $wp_query     WordPress Query object.
  * @global WP_Query $wp_the_query Copy of the WordPress Query object.
  *
  * @param string|array $query_vars Default WP_Query arguments.
  */
 function wp( $query_vars = '' ) {
 	global $wp, $wp_query, $wp_the_query;
 
 	$wp->main( $query_vars );
 
 	if ( ! isset( $wp_the_query ) ) {
 		$wp_the_query = $wp_query;
 	}
 }
 
 /**
  * Retrieve the description for the HTTP status.
  *
  * @since 2.3.0
  * @since 3.9.0 Added status codes 418, 428, 429, 431, and 511.
  * @since 4.5.0 Added status codes 308, 421, and 451.
  * @since 5.1.0 Added status code 103.
  *
  * @global array $wp_header_to_desc
  *
  * @param int $code HTTP status code.
  * @return string Status description if found, an empty string otherwise.
  */
 function get_status_header_desc( $code ) {
 	global $wp_header_to_desc;
 
 	$code = absint( $code );
 
 	if ( ! isset( $wp_header_to_desc ) ) {
 		$wp_header_to_desc = array(
 			100 => 'Continue',
 			101 => 'Switching Protocols',
 			102 => 'Processing',
 			103 => 'Early Hints',
 
 			200 => 'OK',
 			201 => 'Created',
 			202 => 'Accepted',
 			203 => 'Non-Authoritative Information',
 			204 => 'No Content',
 			205 => 'Reset Content',
 			206 => 'Partial Content',
 			207 => 'Multi-Status',
 			226 => 'IM Used',
 
 			300 => 'Multiple Choices',
 			301 => 'Moved Permanently',
 			302 => 'Found',
 			303 => 'See Other',
 			304 => 'Not Modified',
 			305 => 'Use Proxy',
 			306 => 'Reserved',
 			307 => 'Temporary Redirect',
 			308 => 'Permanent Redirect',
 
 			400 => 'Bad Request',
 			401 => 'Unauthorized',
 			402 => 'Payment Required',
 			403 => 'Forbidden',
 			404 => 'Not Found',
 			405 => 'Method Not Allowed',
 			406 => 'Not Acceptable',
 			407 => 'Proxy Authentication Required',
 			408 => 'Request Timeout',
 			409 => 'Conflict',
 			410 => 'Gone',
 			411 => 'Length Required',
 			412 => 'Precondition Failed',
 			413 => 'Request Entity Too Large',
 			414 => 'Request-URI Too Long',
 			415 => 'Unsupported Media Type',
 			416 => 'Requested Range Not Satisfiable',
 			417 => 'Expectation Failed',
 			418 => 'I\'m a teapot',
 			421 => 'Misdirected Request',
 			422 => 'Unprocessable Entity',
 			423 => 'Locked',
 			424 => 'Failed Dependency',
 			426 => 'Upgrade Required',
 			428 => 'Precondition Required',
 			429 => 'Too Many Requests',
 			431 => 'Request Header Fields Too Large',
 			451 => 'Unavailable For Legal Reasons',
 
 			500 => 'Internal Server Error',
 			501 => 'Not Implemented',
 			502 => 'Bad Gateway',
 			503 => 'Service Unavailable',
 			504 => 'Gateway Timeout',
 			505 => 'HTTP Version Not Supported',
 			506 => 'Variant Also Negotiates',
 			507 => 'Insufficient Storage',
 			510 => 'Not Extended',
 			511 => 'Network Authentication Required',
 		);
 	}
 
 	if ( isset( $wp_header_to_desc[ $code ] ) ) {
 		return $wp_header_to_desc[ $code ];
 	} else {
 		return '';
 	}
 }
 
 /**
  * Set HTTP status header.
  *
  * @since 2.0.0
  * @since 4.4.0 Added the `$description` parameter.
  *
  * @see get_status_header_desc()
  *
  * @param int    $code        HTTP status code.
  * @param string $description Optional. A custom description for the HTTP status.
  */
 function status_header( $code, $description = '' ) {
 	if ( ! $description ) {
 		$description = get_status_header_desc( $code );
 	}
 
 	if ( empty( $description ) ) {
 		return;
 	}
 
 	$protocol      = wp_get_server_protocol();
 	$status_header = "$protocol $code $description";
 	if ( function_exists( 'apply_filters' ) ) {
 
 		/**
 		 * Filters an HTTP status header.
 		 *
 		 * @since 2.2.0
 		 *
 		 * @param string $status_header HTTP status header.
 		 * @param int    $code          HTTP status code.
 		 * @param string $description   Description for the status code.
 		 * @param string $protocol      Server protocol.
 		 */
 		$status_header = apply_filters( 'status_header', $status_header, $code, $description, $protocol );
 	}
 
 	if ( ! headers_sent() ) {
 		header( $status_header, true, $code );
 	}
 }
 
 /**
  * Get the header information to prevent caching.
  *
  * The several different headers cover the different ways cache prevention
  * is handled by different browsers
  *
  * @since 2.8.0
  *
  * @return array The associative array of header names and field values.
  */
 function wp_get_nocache_headers() {
 	$headers = array(
 		'Expires'       => 'Wed, 11 Jan 1984 05:00:00 GMT',
 		'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
 	);
 
 	if ( function_exists( 'apply_filters' ) ) {
 		/**
 		 * Filters the cache-controlling headers.
 		 *
 		 * @since 2.8.0
 		 *
 		 * @see wp_get_nocache_headers()
 		 *
 		 * @param array $headers {
 		 *     Header names and field values.
 		 *
 		 *     @type string $Expires       Expires header.
 		 *     @type string $Cache-Control Cache-Control header.
 		 * }
 		 */
 		$headers = (array) apply_filters( 'nocache_headers', $headers );
 	}
 	$headers['Last-Modified'] = false;
 	return $headers;
 }
 
 /**
  * Set the headers to prevent caching for the different browsers.
  *
  * Different browsers support different nocache headers, so several
  * headers must be sent so that all of them get the point that no
  * caching should occur.
  *
  * @since 2.0.0
  *
  * @see wp_get_nocache_headers()
  */
 function nocache_headers() {
 	if ( headers_sent() ) {
 		return;
 	}
 
 	$headers = wp_get_nocache_headers();
 
 	unset( $headers['Last-Modified'] );
 
 	header_remove( 'Last-Modified' );
 
 	foreach ( $headers as $name => $field_value ) {
 		header( "{$name}: {$field_value}" );
 	}
 }
 
 /**
  * Set the headers for caching for 10 days with JavaScript content type.
  *
  * @since 2.1.0
  */
 function cache_javascript_headers() {
 	$expiresOffset = 10 * DAY_IN_SECONDS;
 
 	header( 'Content-Type: text/javascript; charset=' . get_bloginfo( 'charset' ) );
 	header( 'Vary: Accept-Encoding' ); // Handle proxies.
 	header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expiresOffset ) . ' GMT' );
 }
 
 /**
  * Retrieve the number of database queries during the WordPress execution.
  *
  * @since 2.0.0
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
  * @return int Number of database queries.
  */
 function get_num_queries() {
 	global $wpdb;
 	return $wpdb->num_queries;
 }
 
 /**
  * Whether input is yes or no.
  *
  * Must be 'y' to be true.
  *
  * @since 1.0.0
  *
  * @param string $yn Character string containing either 'y' (yes) or 'n' (no).
  * @return bool True if yes, false on anything else.
  */
 function bool_from_yn( $yn ) {
 	return ( 'y' === strtolower( $yn ) );
 }
 
 /**
  * Load the feed template from the use of an action hook.
  *
  * If the feed action does not have a hook, then the function will die with a
  * message telling the visitor that the feed is not valid.
  *
  * It is better to only have one hook for each feed.
  *
  * @since 2.1.0
  *
  * @global WP_Query $wp_query WordPress Query object.
  */
 function do_feed() {
 	global $wp_query;
 
 	$feed = get_query_var( 'feed' );
 
 	// Remove the pad, if present.
 	$feed = preg_replace( '/^_+/', '', $feed );
 
 	if ( '' === $feed || 'feed' === $feed ) {
 		$feed = get_default_feed();
 	}
 
 	if ( ! has_action( "do_feed_{$feed}" ) ) {
 		wp_die( __( 'Error: This is not a valid feed template.' ), '', array( 'response' => 404 ) );
 	}
 
 	/**
 	 * Fires once the given feed is loaded.
 	 *
 	 * The dynamic portion of the hook name, `$feed`, refers to the feed template name.
 	 *
 	 * Possible hook names include:
 	 *
 	 *  - `do_feed_atom`
 	 *  - `do_feed_rdf`
 	 *  - `do_feed_rss`
 	 *  - `do_feed_rss2`
 	 *
 	 * @since 2.1.0
 	 * @since 4.4.0 The `$feed` parameter was added.
 	 *
 	 * @param bool   $is_comment_feed Whether the feed is a comment feed.
 	 * @param string $feed            The feed name.
 	 */
 	do_action( "do_feed_{$feed}", $wp_query->is_comment_feed, $feed );
 }
 
 /**
  * Load the RDF RSS 0.91 Feed template.
  *
  * @since 2.1.0
  *
  * @see load_template()
  */
 function do_feed_rdf() {
 	load_template( ABSPATH . WPINC . '/feed-rdf.php' );
 }
 
 /**
  * Load the RSS 1.0 Feed Template.
  *
  * @since 2.1.0
  *
  * @see load_template()
  */
 function do_feed_rss() {
 	load_template( ABSPATH . WPINC . '/feed-rss.php' );
 }
 
 /**
  * Load either the RSS2 comment feed or the RSS2 posts feed.
  *
  * @since 2.1.0
  *
  * @see load_template()
  *
  * @param bool $for_comments True for the comment feed, false for normal feed.
  */
 function do_feed_rss2( $for_comments ) {
 	if ( $for_comments ) {
 		load_template( ABSPATH . WPINC . '/feed-rss2-comments.php' );
 	} else {
 		load_template( ABSPATH . WPINC . '/feed-rss2.php' );
 	}
 }
 
 /**
  * Load either Atom comment feed or Atom posts feed.
  *
  * @since 2.1.0
  *
  * @see load_template()
  *
  * @param bool $for_comments True for the comment feed, false for normal feed.
  */
 function do_feed_atom( $for_comments ) {
 	if ( $for_comments ) {
 		load_template( ABSPATH . WPINC . '/feed-atom-comments.php' );
 	} else {
 		load_template( ABSPATH . WPINC . '/feed-atom.php' );
 	}
 }
 
 /**
  * Displays the default robots.txt file content.
  *
  * @since 2.1.0
  * @since 5.3.0 Remove the "Disallow: /" output if search engine visiblity is
  *              discouraged in favor of robots meta HTML tag via wp_robots_no_robots()
  *              filter callback.
  */
 function do_robots() {
 	header( 'Content-Type: text/plain; charset=utf-8' );
 
 	/**
 	 * Fires when displaying the robots.txt file.
 	 *
 	 * @since 2.1.0
 	 */
 	do_action( 'do_robotstxt' );
 
 	$output = "User-agent: *\n";
 	$public = get_option( 'blog_public' );
 
 	$site_url = parse_url( site_url() );
 	$path     = ( ! empty( $site_url['path'] ) ) ? $site_url['path'] : '';
 	$output  .= "Disallow: $path/wp-admin/\n";
 	$output  .= "Allow: $path/wp-admin/admin-ajax.php\n";
 
 	/**
 	 * Filters the robots.txt output.
 	 *
 	 * @since 3.0.0
 	 *
 	 * @param string $output The robots.txt output.
 	 * @param bool   $public Whether the site is considered "public".
 	 */
 	echo apply_filters( 'robots_txt', $output, $public );
 }
 
 /**
  * Display the favicon.ico file content.
  *
  * @since 5.4.0
  */
 function do_favicon() {
 	/**
 	 * Fires when serving the favicon.ico file.
 	 *
 	 * @since 5.4.0
 	 */
 	do_action( 'do_faviconico' );
 
 	wp_redirect( get_site_icon_url( 32, includes_url( 'images/w-logo-blue-white-bg.png' ) ) );
 	exit;
 }
 
 /**
  * Determines whether WordPress is already installed.
  *
  * The cache will be checked first. If you have a cache plugin, which saves
  * the cache values, then this will work. If you use the default WordPress
  * cache, and the database goes away, then you might have problems.
  *
  * Checks for the 'siteurl' option for whether WordPress is installed.
  *
  * For more information on this and similar theme functions, check out
  * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
  * Conditional Tags} article in the Theme Developer Handbook.
  *
  * @since 2.1.0
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
  * @return bool Whether the site is already installed.
  */
 function is_blog_installed() {
 	global $wpdb;
 
 	/*
 	 * Check cache first. If options table goes away and we have true
 	 * cached, oh well.
 	 */
 	if ( wp_cache_get( 'is_blog_installed' ) ) {
 		return true;
 	}
 
 	$suppress = $wpdb->suppress_errors();
 	if ( ! wp_installing() ) {
 		$alloptions = wp_load_alloptions();
 	}
 	// If siteurl is not set to autoload, check it specifically.
 	if ( ! isset( $alloptions['siteurl'] ) ) {
 		$installed = $wpdb->get_var( "SELECT option_value FROM $wpdb->options WHERE option_name = 'siteurl'" );
 	} else {
 		$installed = $alloptions['siteurl'];
 	}
 	$wpdb->suppress_errors( $suppress );
 
 	$installed = ! empty( $installed );
 	wp_cache_set( 'is_blog_installed', $installed );
 
 	if ( $installed ) {
 		return true;
 	}
 
 	// If visiting repair.php, return true and let it take over.
 	if ( defined( 'WP_REPAIRING' ) ) {
 		return true;
 	}
 
 	$suppress = $wpdb->suppress_errors();
 
 	/*
 	 * Loop over the WP tables. If none exist, then scratch installation is allowed.
 	 * If one or more exist, suggest table repair since we got here because the
 	 * options table could not be accessed.
 	 */
 	$wp_tables = $wpdb->tables();
 	foreach ( $wp_tables as $table ) {
 		// The existence of custom user tables shouldn't suggest an unwise state or prevent a clean installation.
 		if ( defined( 'CUSTOM_USER_TABLE' ) && CUSTOM_USER_TABLE == $table ) {
 			continue;
 		}
 		if ( defined( 'CUSTOM_USER_META_TABLE' ) && CUSTOM_USER_META_TABLE == $table ) {
 			continue;
 		}
 
 		$described_table = $wpdb->get_results( "DESCRIBE $table;" );
 		if (
 			( ! $described_table && empty( $wpdb->last_error ) ) ||
 			( is_array( $described_table ) && 0 === count( $described_table ) )
 		) {
 			continue;
 		}
 
 		// One or more tables exist. This is not good.
 
 		wp_load_translations_early();
 
 		// Die with a DB error.
 		$wpdb->error = sprintf(
 			/* translators: %s: Database repair URL. */
 			__( 'One or more database tables are unavailable. The database may need to be <a href="%s">repaired</a>.' ),
 			'maint/repair.php?referrer=is_blog_installed'
 		);
 
 		dead_db();
 	}
 
 	$wpdb->suppress_errors( $suppress );
 
 	wp_cache_set( 'is_blog_installed', false );
 
 	return false;
 }
 
 /**
  * Retrieve URL with nonce added to URL query.
  *
  * @since 2.0.4
  *
  * @param string     $actionurl URL to add nonce action.
  * @param int|string $action    Optional. Nonce action name. Default -1.
  * @param string     $name      Optional. Nonce name. Default '_wpnonce'.
  * @return string Escaped URL with nonce action added.
  */
 function wp_nonce_url( $actionurl, $action = -1, $name = '_wpnonce' ) {
 	$actionurl = str_replace( '&amp;', '&', $actionurl );
 	return esc_html( add_query_arg( $name, wp_create_nonce( $action ), $actionurl ) );
 }
 
 /**
  * Retrieve or display nonce hidden field for forms.
  *
  * The nonce field is used to validate that the contents of the form came from
  * the location on the current site and not somewhere else. The nonce does not
  * offer absolute protection, but should protect against most cases. It is very
  * important to use nonce field in forms.
  *
  * The $action and $name are optional, but if you want to have better security,
  * it is strongly suggested to set those two parameters. It is easier to just
  * call the function without any parameters, because validation of the nonce
  * doesn't require any parameters, but since crackers know what the default is
  * it won't be difficult for them to find a way around your nonce and cause
  * damage.
  *
  * The input name will be whatever $name value you gave. The input value will be
  * the nonce creation value.
  *
  * @since 2.0.4
  *
  * @param int|string $action  Optional. Action name. Default -1.
  * @param string     $name    Optional. Nonce name. Default '_wpnonce'.
  * @param bool       $referer Optional. Whether to set the referer field for validation. Default true.
  * @param bool       $echo    Optional. Whether to display or return hidden form field. Default true.
  * @return string Nonce field HTML markup.
  */
 function wp_nonce_field( $action = -1, $name = '_wpnonce', $referer = true, $echo = true ) {
 	$name        = esc_attr( $name );
 	$nonce_field = '<input type="hidden" id="' . $name . '" name="' . $name . '" value="' . wp_create_nonce( $action ) . '" />';
 
 	if ( $referer ) {
 		$nonce_field .= wp_referer_field( false );
 	}
 
 	if ( $echo ) {
 		echo $nonce_field;
 	}
 
 	return $nonce_field;
 }
 
 /**
  * Retrieve or display referer hidden field for forms.
  *
  * The referer link is the current Request URI from the server super global. The
  * input name is '_wp_http_referer', in case you wanted to check manually.
  *
  * @since 2.0.4
  *
  * @param bool $echo Optional. Whether to echo or return the referer field. Default true.
  * @return string Referer field HTML markup.
  */
 function wp_referer_field( $echo = true ) {
 	$referer_field = '<input type="hidden" name="_wp_http_referer" value="' . esc_attr( wp_unslash( $_SERVER['REQUEST_URI'] ) ) . '" />';
 
 	if ( $echo ) {
 		echo $referer_field;
 	}
 
 	return $referer_field;
 }
 
 /**
  * Retrieve or display original referer hidden field for forms.
  *
  * The input name is '_wp_original_http_referer' and will be either the same
  * value of wp_referer_field(), if that was posted already or it will be the
  * current page, if it doesn't exist.
  *
  * @since 2.0.4
  *
  * @param bool   $echo         Optional. Whether to echo the original http referer. Default true.
  * @param string $jump_back_to Optional. Can be 'previous' or page you want to jump back to.
  *                             Default 'current'.
  * @return string Original referer field.
  */
 function wp_original_referer_field( $echo = true, $jump_back_to = 'current' ) {
 	$ref = wp_get_original_referer();
 
 	if ( ! $ref ) {
 		$ref = ( 'previous' === $jump_back_to ) ? wp_get_referer() : wp_unslash( $_SERVER['REQUEST_URI'] );
 	}
 
 	$orig_referer_field = '<input type="hidden" name="_wp_original_http_referer" value="' . esc_attr( $ref ) . '" />';
 
 	if ( $echo ) {
 		echo $orig_referer_field;
 	}
 
 	return $orig_referer_field;
 }
 
 /**
  * Retrieve referer from '_wp_http_referer' or HTTP referer.
  *
  * If it's the same as the current request URL, will return false.
  *
  * @since 2.0.4
  *
  * @return string|false Referer URL on success, false on failure.
  */
 function wp_get_referer() {
 	if ( ! function_exists( 'wp_validate_redirect' ) ) {
 		return false;
 	}
 
 	$ref = wp_get_raw_referer();
 
 	if ( $ref && wp_unslash( $_SERVER['REQUEST_URI'] ) !== $ref && home_url() . wp_unslash( $_SERVER['REQUEST_URI'] ) !== $ref ) {
 		return wp_validate_redirect( $ref, false );
 	}
 
 	return false;
 }
 
 /**
  * Retrieves unvalidated referer from '_wp_http_referer' or HTTP referer.
  *
  * Do not use for redirects, use wp_get_referer() instead.
  *
  * @since 4.5.0
  *
  * @return string|false Referer URL on success, false on failure.
  */
 function wp_get_raw_referer() {
 	if ( ! empty( $_REQUEST['_wp_http_referer'] ) ) {
 		return wp_unslash( $_REQUEST['_wp_http_referer'] );
 	} elseif ( ! empty( $_SERVER['HTTP_REFERER'] ) ) {
 		return wp_unslash( $_SERVER['HTTP_REFERER'] );
 	}
 
 	return false;
 }
 
 /**
  * Retrieve original referer that was posted, if it exists.
  *
  * @since 2.0.4
  *
  * @return string|false Original referer URL on success, false on failure.
  */
 function wp_get_original_referer() {
 	if ( ! empty( $_REQUEST['_wp_original_http_referer'] ) && function_exists( 'wp_validate_redirect' ) ) {
 		return wp_validate_redirect( wp_unslash( $_REQUEST['_wp_original_http_referer'] ), false );
 	}
 
 	return false;
 }
 
 /**
  * Recursive directory creation based on full path.
  *
  * Will attempt to set permissions on folders.
  *
  * @since 2.0.1
  *
  * @param string $target Full path to attempt to create.
  * @return bool Whether the path was created. True if path already exists.
  */
 function wp_mkdir_p( $target ) {
 	$wrapper = null;
 
 	// Strip the protocol.
 	if ( wp_is_stream( $target ) ) {
 		list( $wrapper, $target ) = explode( '://', $target, 2 );
 	}
 
 	// From php.net/mkdir user contributed notes.
 	$target = str_replace( '//', '/', $target );
 
 	// Put the wrapper back on the target.
 	if ( null !== $wrapper ) {
 		$target = $wrapper . '://' . $target;
 	}
 
 	/*
 	 * Safe mode fails with a trailing slash under certain PHP versions.
 	 * Use rtrim() instead of untrailingslashit to avoid formatting.php dependency.
 	 */
 	$target = rtrim( $target, '/' );
 	if ( empty( $target ) ) {
 		$target = '/';
 	}
 
 	if ( file_exists( $target ) ) {
 		return @is_dir( $target );
 	}
 
 	// Do not allow path traversals.
 	if ( false !== strpos( $target, '../' ) || false !== strpos( $target, '..' . DIRECTORY_SEPARATOR ) ) {
 		return false;
 	}
 
 	// We need to find the permissions of the parent folder that exists and inherit that.
 	$target_parent = dirname( $target );
 	while ( '.' !== $target_parent && ! is_dir( $target_parent ) && dirname( $target_parent ) !== $target_parent ) {
 		$target_parent = dirname( $target_parent );
 	}
 
 	// Get the permission bits.
 	$stat = @stat( $target_parent );
 	if ( $stat ) {
 		$dir_perms = $stat['mode'] & 0007777;
 	} else {
 		$dir_perms = 0777;
 	}
 
 	if ( @mkdir( $target, $dir_perms, true ) ) {
 
 		/*
 		 * If a umask is set that modifies $dir_perms, we'll have to re-set
 		 * the $dir_perms correctly with chmod()
 		 */
 		if ( ( $dir_perms & ~umask() ) != $dir_perms ) {
 			$folder_parts = explode( '/', substr( $target, strlen( $target_parent ) + 1 ) );
 			for ( $i = 1, $c = count( $folder_parts ); $i <= $c; $i++ ) {
 				chmod( $target_parent . '/' . implode( '/', array_slice( $folder_parts, 0, $i ) ), $dir_perms );
 			}
 		}
 
 		return true;
 	}
 
 	return false;
 }
 
 /**
  * Test if a given filesystem path is absolute.
  *
  * For example, '/foo/bar', or 'c:\windows'.
  *
  * @since 2.5.0
  *
  * @param string $path File path.
  * @return bool True if path is absolute, false is not absolute.
  */
 function path_is_absolute( $path ) {
 	/*
 	 * Check to see if the path is a stream and check to see if its an actual
 	 * path or file as realpath() does not support stream wrappers.
 	 */
 	if ( wp_is_stream( $path ) && ( is_dir( $path ) || is_file( $path ) ) ) {
 		return true;
 	}
 
 	/*
 	 * This is definitive if true but fails if $path does not exist or contains
 	 * a symbolic link.
 	 */
 	if ( realpath( $path ) == $path ) {
 		return true;
 	}
 
 	if ( strlen( $path ) == 0 || '.' === $path[0] ) {
 		return false;
 	}
 
 	// Windows allows absolute paths like this.
 	if ( preg_match( '#^[a-zA-Z]:\\\\#', $path ) ) {
 		return true;
 	}
 
 	// A path starting with / or \ is absolute; anything else is relative.
 	return ( '/' === $path[0] || '\\' === $path[0] );
 }
 
 /**
  * Join two filesystem paths together.
  *
  * For example, 'give me $path relative to $base'. If the $path is absolute,
  * then it the full path is returned.
  *
  * @since 2.5.0
  *
  * @param string $base Base path.
  * @param string $path Path relative to $base.
  * @return string The path with the base or absolute path.
  */
 function path_join( $base, $path ) {
 	if ( path_is_absolute( $path ) ) {
 		return $path;
 	}
 
 	return rtrim( $base, '/' ) . '/' . ltrim( $path, '/' );
 }
 
 /**
  * Normalize a filesystem path.
  *
  * On windows systems, replaces backslashes with forward slashes
  * and forces upper-case drive letters.
  * Allows for two leading slashes for Windows network shares, but
  * ensures that all other duplicate slashes are reduced to a single.
  *
  * @since 3.9.0
  * @since 4.4.0 Ensures upper-case drive letters on Windows systems.
  * @since 4.5.0 Allows for Windows network shares.
  * @since 4.9.7 Allows for PHP file wrappers.
  *
  * @param string $path Path to normalize.
  * @return string Normalized path.
  */
 function wp_normalize_path( $path ) {
 	$wrapper = '';
 
 	if ( wp_is_stream( $path ) ) {
 		list( $wrapper, $path ) = explode( '://', $path, 2 );
 
 		$wrapper .= '://';
 	}
 
 	// Standardise all paths to use '/'.
 	$path = str_replace( '\\', '/', $path );
 
 	// Replace multiple slashes down to a singular, allowing for network shares having two slashes.
 	$path = preg_replace( '|(?<=.)/+|', '/', $path );
 
 	// Windows paths should uppercase the drive letter.
 	if ( ':' === substr( $path, 1, 1 ) ) {
 		$path = ucfirst( $path );
 	}
 
 	return $wrapper . $path;
 }
 
 /**
  * Determine a writable directory for temporary files.
  *
  * Function's preference is the return value of sys_get_temp_dir(),
  * followed by your PHP temporary upload directory, followed by WP_CONTENT_DIR,
  * before finally defaulting to /tmp/
  *
  * In the event that this function does not find a writable location,
  * It may be overridden by the WP_TEMP_DIR constant in your wp-config.php file.
  *
  * @since 2.5.0
  *
  * @return string Writable temporary directory.
  */
 function get_temp_dir() {
 	static $temp = '';
 	if ( defined( 'WP_TEMP_DIR' ) ) {
 		return trailingslashit( WP_TEMP_DIR );
 	}
 
 	if ( $temp ) {
 		return trailingslashit( $temp );
 	}
 
 	if ( function_exists( 'sys_get_temp_dir' ) ) {
 		$temp = sys_get_temp_dir();
 		if ( @is_dir( $temp ) && wp_is_writable( $temp ) ) {
 			return trailingslashit( $temp );
 		}
 	}
 
 	$temp = ini_get( 'upload_tmp_dir' );
 	if ( @is_dir( $temp ) && wp_is_writable( $temp ) ) {
 		return trailingslashit( $temp );
 	}
 
 	$temp = WP_CONTENT_DIR . '/';
 	if ( is_dir( $temp ) && wp_is_writable( $temp ) ) {
 		return $temp;
 	}
 
 	return '/tmp/';
 }
 
 /**
  * Determine if a directory is writable.
  *
  * This function is used to work around certain ACL issues in PHP primarily
  * affecting Windows Servers.
  *
  * @since 3.6.0
  *
  * @see win_is_writable()
  *
  * @param string $path Path to check for write-ability.
  * @return bool Whether the path is writable.
  */
 function wp_is_writable( $path ) {
 	if ( 'WIN' === strtoupper( substr( PHP_OS, 0, 3 ) ) ) {
 		return win_is_writable( $path );
 	} else {
 		return @is_writable( $path );
 	}
 }
 
 /**
  * Workaround for Windows bug in is_writable() function
  *
  * PHP has issues with Windows ACL's for determine if a
  * directory is writable or not, this works around them by
  * checking the ability to open files rather than relying
  * upon PHP to interprate the OS ACL.
  *
  * @since 2.8.0
  *
  * @see https://bugs.php.net/bug.php?id=27609
  * @see https://bugs.php.net/bug.php?id=30931
  *
  * @param string $path Windows path to check for write-ability.
  * @return bool Whether the path is writable.
  */
 function win_is_writable( $path ) {
 	if ( '/' === $path[ strlen( $path ) - 1 ] ) {
 		// If it looks like a directory, check a random file within the directory.
 		return win_is_writable( $path . uniqid( mt_rand() ) . '.tmp' );
 	} elseif ( is_dir( $path ) ) {
 		// If it's a directory (and not a file), check a random file within the directory.
 		return win_is_writable( $path . '/' . uniqid( mt_rand() ) . '.tmp' );
 	}
 
 	// Check tmp file for read/write capabilities.
 	$should_delete_tmp_file = ! file_exists( $path );
 
 	$f = @fopen( $path, 'a' );
 	if ( false === $f ) {
 		return false;
 	}
 	fclose( $f );
 
 	if ( $should_delete_tmp_file ) {
 		unlink( $path );
 	}
 
 	return true;
 }
 
 /**
  * Retrieves uploads directory information.
  *
  * Same as wp_upload_dir() but "light weight" as it doesn't attempt to create the uploads directory.
  * Intended for use in themes, when only 'basedir' and 'baseurl' are needed, generally in all cases
  * when not uploading files.
  *
  * @since 4.5.0
  *
  * @see wp_upload_dir()
  *
  * @return array See wp_upload_dir() for description.
  */
 function wp_get_upload_dir() {
 	return wp_upload_dir( null, false );
 }
 
 /**
  * Returns an array containing the current upload directory's path and URL.
  *
  * Checks the 'upload_path' option, which should be from the web root folder,
  * and if it isn't empty it will be used. If it is empty, then the path will be
  * 'WP_CONTENT_DIR/uploads'. If the 'UPLOADS' constant is defined, then it will
  * override the 'upload_path' option and 'WP_CONTENT_DIR/uploads' path.
  *
  * The upload URL path is set either by the 'upload_url_path' option or by using
  * the 'WP_CONTENT_URL' constant and appending '/uploads' to the path.
  *
  * If the 'uploads_use_yearmonth_folders' is set to true (checkbox if checked in
  * the administration settings panel), then the time will be used. The format
  * will be year first and then month.
  *
  * If the path couldn't be created, then an error will be returned with the key
  * 'error' containing the error message. The error suggests that the parent
  * directory is not writable by the server.
  *
  * @since 2.0.0
  * @uses _wp_upload_dir()
  *
  * @param string $time Optional. Time formatted in 'yyyy/mm'. Default null.
  * @param bool   $create_dir Optional. Whether to check and create the uploads directory.
  *                           Default true for backward compatibility.
  * @param bool   $refresh_cache Optional. Whether to refresh the cache. Default false.
  * @return array {
  *     Array of information about the upload directory.
  *
  *     @type string       $path    Base directory and subdirectory or full path to upload directory.
  *     @type string       $url     Base URL and subdirectory or absolute URL to upload directory.
  *     @type string       $subdir  Subdirectory if uploads use year/month folders option is on.
  *     @type string       $basedir Path without subdir.
  *     @type string       $baseurl URL path without subdir.
  *     @type string|false $error   False or error message.
  * }
  */
 function wp_upload_dir( $time = null, $create_dir = true, $refresh_cache = false ) {
 	static $cache = array(), $tested_paths = array();
 
 	$key = sprintf( '%d-%s', get_current_blog_id(), (string) $time );
 
 	if ( $refresh_cache || empty( $cache[ $key ] ) ) {
 		$cache[ $key ] = _wp_upload_dir( $time );
 	}
 
 	/**
 	 * Filters the uploads directory data.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param array $uploads {
 	 *     Array of information about the upload directory.
 	 *
 	 *     @type string       $path    Base directory and subdirectory or full path to upload directory.
 	 *     @type string       $url     Base URL and subdirectory or absolute URL to upload directory.
 	 *     @type string       $subdir  Subdirectory if uploads use year/month folders option is on.
 	 *     @type string       $basedir Path without subdir.
 	 *     @type string       $baseurl URL path without subdir.
 	 *     @type string|false $error   False or error message.
 	 * }
 	 */
 	$uploads = apply_filters( 'upload_dir', $cache[ $key ] );
 
 	if ( $create_dir ) {
 		$path = $uploads['path'];
 
 		if ( array_key_exists( $path, $tested_paths ) ) {
 			$uploads['error'] = $tested_paths[ $path ];
 		} else {
 			if ( ! wp_mkdir_p( $path ) ) {
 				if ( 0 === strpos( $uploads['basedir'], ABSPATH ) ) {
 					$error_path = str_replace( ABSPATH, '', $uploads['basedir'] ) . $uploads['subdir'];
 				} else {
 					$error_path = wp_basename( $uploads['basedir'] ) . $uploads['subdir'];
 				}
 
 				$uploads['error'] = sprintf(
 					/* translators: %s: Directory path. */
 					__( 'Unable to create directory %s. Is its parent directory writable by the server?' ),
 					esc_html( $error_path )
 				);
 			}
 
 			$tested_paths[ $path ] = $uploads['error'];
 		}
 	}
 
 	return $uploads;
 }
 
 /**
  * A non-filtered, non-cached version of wp_upload_dir() that doesn't check the path.
  *
  * @since 4.5.0
  * @access private
  *
  * @param string $time Optional. Time formatted in 'yyyy/mm'. Default null.
  * @return array See wp_upload_dir()
  */
 function _wp_upload_dir( $time = null ) {
 	$siteurl     = get_option( 'siteurl' );
 	$upload_path = trim( get_option( 'upload_path' ) );
 
 	if ( empty( $upload_path ) || 'wp-content/uploads' === $upload_path ) {
 		$dir = WP_CONTENT_DIR . '/uploads';
 	} elseif ( 0 !== strpos( $upload_path, ABSPATH ) ) {
 		// $dir is absolute, $upload_path is (maybe) relative to ABSPATH.
 		$dir = path_join( ABSPATH, $upload_path );
 	} else {
 		$dir = $upload_path;
 	}
 
 	$url = get_option( 'upload_url_path' );
 	if ( ! $url ) {
 		if ( empty( $upload_path ) || ( 'wp-content/uploads' === $upload_path ) || ( $upload_path == $dir ) ) {
 			$url = WP_CONTENT_URL . '/uploads';
 		} else {
 			$url = trailingslashit( $siteurl ) . $upload_path;
 		}
 	}
 
 	/*
 	 * Honor the value of UPLOADS. This happens as long as ms-files rewriting is disabled.
 	 * We also sometimes obey UPLOADS when rewriting is enabled -- see the next block.
 	 */
 	if ( defined( 'UPLOADS' ) && ! ( is_multisite() && get_site_option( 'ms_files_rewriting' ) ) ) {
 		$dir = ABSPATH . UPLOADS;
 		$url = trailingslashit( $siteurl ) . UPLOADS;
 	}
 
 	// If multisite (and if not the main site in a post-MU network).
 	if ( is_multisite() && ! ( is_main_network() && is_main_site() && defined( 'MULTISITE' ) ) ) {
 
 		if ( ! get_site_option( 'ms_files_rewriting' ) ) {
 			/*
 			 * If ms-files rewriting is disabled (networks created post-3.5), it is fairly
 			 * straightforward: Append sites/%d if we're not on the main site (for post-MU
 			 * networks). (The extra directory prevents a four-digit ID from conflicting with
 			 * a year-based directory for the main site. But if a MU-era network has disabled
 			 * ms-files rewriting manually, they don't need the extra directory, as they never
 			 * had wp-content/uploads for the main site.)
 			 */
 
 			if ( defined( 'MULTISITE' ) ) {
 				$ms_dir = '/sites/' . get_current_blog_id();
 			} else {
 				$ms_dir = '/' . get_current_blog_id();
 			}
 
 			$dir .= $ms_dir;
 			$url .= $ms_dir;
 
 		} elseif ( defined( 'UPLOADS' ) && ! ms_is_switched() ) {
 			/*
 			 * Handle the old-form ms-files.php rewriting if the network still has that enabled.
 			 * When ms-files rewriting is enabled, then we only listen to UPLOADS when:
 			 * 1) We are not on the main site in a post-MU network, as wp-content/uploads is used
 			 *    there, and
 			 * 2) We are not switched, as ms_upload_constants() hardcodes these constants to reflect
 			 *    the original blog ID.
 			 *
 			 * Rather than UPLOADS, we actually use BLOGUPLOADDIR if it is set, as it is absolute.
 			 * (And it will be set, see ms_upload_constants().) Otherwise, UPLOADS can be used, as
 			 * as it is relative to ABSPATH. For the final piece: when UPLOADS is used with ms-files
 			 * rewriting in multisite, the resulting URL is /files. (#WP22702 for background.)
 			 */
 
 			if ( defined( 'BLOGUPLOADDIR' ) ) {
 				$dir = untrailingslashit( BLOGUPLOADDIR );
 			} else {
 				$dir = ABSPATH . UPLOADS;
 			}
 			$url = trailingslashit( $siteurl ) . 'files';
 		}
 	}
 
 	$basedir = $dir;
 	$baseurl = $url;
 
 	$subdir = '';
 	if ( get_option( 'uploads_use_yearmonth_folders' ) ) {
 		// Generate the yearly and monthly directories.
 		if ( ! $time ) {
 			$time = current_time( 'mysql' );
 		}
 		$y      = substr( $time, 0, 4 );
 		$m      = substr( $time, 5, 2 );
 		$subdir = "/$y/$m";
 	}
 
 	$dir .= $subdir;
 	$url .= $subdir;
 
 	return array(
 		'path'    => $dir,
 		'url'     => $url,
 		'subdir'  => $subdir,
 		'basedir' => $basedir,
 		'baseurl' => $baseurl,
 		'error'   => false,
 	);
 }
 
 /**
  * Get a filename that is sanitized and unique for the given directory.
  *
  * If the filename is not unique, then a number will be added to the filename
  * before the extension, and will continue adding numbers until the filename
  * is unique.
  *
  * The callback function allows the caller to use their own method to create
  * unique file names. If defined, the callback should take three arguments:
  * - directory, base filename, and extension - and return a unique filename.
  *
  * @since 2.5.0
  *
  * @param string   $dir                      Directory.
  * @param string   $filename                 File name.
  * @param callable $unique_filename_callback Callback. Default null.
  * @return string New filename, if given wasn't unique.
  */
 function wp_unique_filename( $dir, $filename, $unique_filename_callback = null ) {
 	// Sanitize the file name before we begin processing.
 	$filename = sanitize_file_name( $filename );
 	$ext2     = null;
 
 	// Initialize vars used in the wp_unique_filename filter.
 	$number        = '';
 	$alt_filenames = array();
 
 	// Separate the filename into a name and extension.
 	$ext  = pathinfo( $filename, PATHINFO_EXTENSION );
 	$name = pathinfo( $filename, PATHINFO_BASENAME );
 
 	if ( $ext ) {
 		$ext = '.' . $ext;
 	}
 
 	// Edge case: if file is named '.ext', treat as an empty name.
 	if ( $name === $ext ) {
 		$name = '';
 	}
 
 	/*
 	 * Increment the file number until we have a unique file to save in $dir.
 	 * Use callback if supplied.
 	 */
 	if ( $unique_filename_callback && is_callable( $unique_filename_callback ) ) {
 		$filename = call_user_func( $unique_filename_callback, $dir, $name, $ext );
 	} else {
 		$fname = pathinfo( $filename, PATHINFO_FILENAME );
 
 		// Always append a number to file names that can potentially match image sub-size file names.
 		if ( $fname && preg_match( '/-(?:\d+x\d+|scaled|rotated)$/', $fname ) ) {
 			$number = 1;
 
 			// At this point the file name may not be unique. This is tested below and the $number is incremented.
 			$filename = str_replace( "{$fname}{$ext}", "{$fname}-{$number}{$ext}", $filename );
 		}
 
 		// Get the mime type. Uploaded files were already checked with wp_check_filetype_and_ext()
 		// in _wp_handle_upload(). Using wp_check_filetype() would be sufficient here.
 		$file_type = wp_check_filetype( $filename );
 		$mime_type = $file_type['type'];
 
 		$is_image    = ( ! empty( $mime_type ) && 0 === strpos( $mime_type, 'image/' ) );
 		$upload_dir  = wp_get_upload_dir();
 		$lc_filename = null;
 
 		$lc_ext = strtolower( $ext );
 		$_dir   = trailingslashit( $dir );
 
 		// If the extension is uppercase add an alternate file name with lowercase extension. Both need to be tested
 		// for uniqueness as the extension will be changed to lowercase for better compatibility with different filesystems.
 		// Fixes an inconsistency in WP < 2.9 where uppercase extensions were allowed but image sub-sizes were created with
 		// lowercase extensions.
 		if ( $ext && $lc_ext !== $ext ) {
 			$lc_filename = preg_replace( '|' . preg_quote( $ext ) . '$|', $lc_ext, $filename );
 		}
 
 		// Increment the number added to the file name if there are any files in $dir whose names match one of the
 		// possible name variations.
 		while ( file_exists( $_dir . $filename ) || ( $lc_filename && file_exists( $_dir . $lc_filename ) ) ) {
 			$new_number = (int) $number + 1;
 
 			if ( $lc_filename ) {
 				$lc_filename = str_replace( array( "-{$number}{$lc_ext}", "{$number}{$lc_ext}" ), "-{$new_number}{$lc_ext}", $lc_filename );
 			}
 
 			if ( '' === "{$number}{$ext}" ) {
 				$filename = "{$filename}-{$new_number}";
 			} else {
 				$filename = str_replace( array( "-{$number}{$ext}", "{$number}{$ext}" ), "-{$new_number}{$ext}", $filename );
 			}
 
 			$number = $new_number;
 		}
 
 		// Change the extension to lowercase if needed.
 		if ( $lc_filename ) {
 			$filename = $lc_filename;
 		}
 
 		// Prevent collisions with existing file names that contain dimension-like strings
 		// (whether they are subsizes or originals uploaded prior to #42437).
 
 		$files = array();
 		$count = 10000;
 
 		// The (resized) image files would have name and extension, and will be in the uploads dir.
 		if ( $name && $ext && @is_dir( $dir ) && false !== strpos( $dir, $upload_dir['basedir'] ) ) {
 			/**
 			 * Filters the file list used for calculating a unique filename for a newly added file.
 			 *
 			 * Returning an array from the filter will effectively short-circuit retrieval
 			 * from the filesystem and return the passed value instead.
 			 *
 			 * @since 5.5.0
 			 *
 			 * @param array|null $files    The list of files to use for filename comparisons.
 			 *                             Default null (to retrieve the list from the filesystem).
 			 * @param string     $dir      The directory for the new file.
 			 * @param string     $filename The proposed filename for the new file.
 			 */
 			$files = apply_filters( 'pre_wp_unique_filename_file_list', null, $dir, $filename );
 
 			if ( null === $files ) {
 				// List of all files and directories contained in $dir.
 				$files = @scandir( $dir );
 			}
 
 			if ( ! empty( $files ) ) {
 				// Remove "dot" dirs.
 				$files = array_diff( $files, array( '.', '..' ) );
 			}
 
 			if ( ! empty( $files ) ) {
 				$count = count( $files );
 
 				// Ensure this never goes into infinite loop
 				// as it uses pathinfo() and regex in the check, but string replacement for the changes.
 				$i = 0;
 
 				while ( $i <= $count && _wp_check_existing_file_names( $filename, $files ) ) {
 					$new_number = (int) $number + 1;
 
 					// If $ext is uppercase it was replaced with the lowercase version after the previous loop.
 					$filename = str_replace( array( "-{$number}{$lc_ext}", "{$number}{$lc_ext}" ), "-{$new_number}{$lc_ext}", $filename );
 
 					$number = $new_number;
 					$i++;
 				}
 			}
 		}
 
 		// Check if an image will be converted after uploading or some existing images sub-sizes file names may conflict
 		// when regenerated. If yes, ensure the new file name will be unique and will produce unique sub-sizes.
 		if ( $is_image ) {
 			$output_formats = apply_filters( 'image_editor_output_format', array(), $_dir . $filename, $mime_type );
 			$alt_types      = array();
 
 			if ( ! empty( $output_formats[ $mime_type ] ) ) {
 				// The image will be converted to this format/mime type.
 				$alt_mime_type = $output_formats[ $mime_type ];
 
 				// Other types of images whose names may conflict if their sub-sizes are regenerated.
 				$alt_types   = array_keys( array_intersect( $output_formats, array( $mime_type, $alt_mime_type ) ) );
 				$alt_types[] = $alt_mime_type;
 			} elseif ( ! empty( $output_formats ) ) {
 				$alt_types = array_keys( array_intersect( $output_formats, array( $mime_type ) ) );
 			}
 
 			// Remove duplicates and the original mime type. It will be added later if needed.
 			$alt_types = array_unique( array_diff( $alt_types, array( $mime_type ) ) );
 
 			foreach ( $alt_types as $alt_type ) {
 				$alt_ext = wp_get_default_extension_for_mime_type( $alt_type );
 
 				if ( ! $alt_ext ) {
 					continue;
 				}
 
 				$alt_ext      = ".{$alt_ext}";
 				$alt_filename = preg_replace( '|' . preg_quote( $lc_ext ) . '$|', $alt_ext, $filename );
 
 				$alt_filenames[ $alt_ext ] = $alt_filename;
 			}
 
 			if ( ! empty( $alt_filenames ) ) {
 				// Add the original filename. It needs to be checked again together with the alternate filenames
 				// when $number is incremented.
 				$alt_filenames[ $lc_ext ] = $filename;
 
 				// Ensure no infinite loop.
 				$i = 0;
 
 				while ( $i <= $count && _wp_check_alternate_file_names( $alt_filenames, $_dir, $files ) ) {
 					$new_number = (int) $number + 1;
 
 					foreach ( $alt_filenames as $alt_ext => $alt_filename ) {
 						$alt_filenames[ $alt_ext ] = str_replace( array( "-{$number}{$alt_ext}", "{$number}{$alt_ext}" ), "-{$new_number}{$alt_ext}", $alt_filename );
 					}
 
 					// Also update the $number in (the output) $filename.
 					// If the extension was uppercase it was already replaced with the lowercase version.
 					$filename = str_replace( array( "-{$number}{$lc_ext}", "{$number}{$lc_ext}" ), "-{$new_number}{$lc_ext}", $filename );
 
 					$number = $new_number;
 					$i++;
 				}
 			}
 		}
 	}
 
 	/**
 	 * Filters the result when generating a unique file name.
 	 *
 	 * @since 4.5.0
 	 * @since 5.8.1 The `$alt_filenames` and `$number` parameters were added.
 	 *
 	 * @param string        $filename                 Unique file name.
 	 * @param string        $ext                      File extension, eg. ".png".
 	 * @param string        $dir                      Directory path.
 	 * @param callable|null $unique_filename_callback Callback function that generates the unique file name.
 	 * @param string[]      $alt_filenames            Array of alternate file names that were checked for collisions.
 	 * @param int|string    $number                   The highest number that was used to make the file name unique
 	 *                                                or an empty string if unused.
 	 */
 	return apply_filters( 'wp_unique_filename', $filename, $ext, $dir, $unique_filename_callback, $alt_filenames, $number );
 }
 
 /**
  * Helper function to test if each of an array of file names could conflict with existing files.
  *
  * @since 5.8.1
  * @access private
  *
  * @param string[] $filenames Array of file names to check.
  * @param string   $dir       The directory containing the files.
  * @param array    $files     An array of existing files in the directory. May be empty.
  * @return bool True if the tested file name could match an existing file, false otherwise.
  */
 function _wp_check_alternate_file_names( $filenames, $dir, $files ) {
 	foreach ( $filenames as $filename ) {
 		if ( file_exists( $dir . $filename ) ) {
 			return true;
 		}
 
 		if ( ! empty( $files ) && _wp_check_existing_file_names( $filename, $files ) ) {
 			return true;
 		}
 	}
 
 	return false;
 }
 
 /**
  * Helper function to check if a file name could match an existing image sub-size file name.
  *
  * @since 5.3.1
  * @access private
  *
  * @param string $filename The file name to check.
  * @param array  $files    An array of existing files in the directory.
  * @return bool True if the tested file name could match an existing file, false otherwise.
  */
 function _wp_check_existing_file_names( $filename, $files ) {
 	$fname = pathinfo( $filename, PATHINFO_FILENAME );
 	$ext   = pathinfo( $filename, PATHINFO_EXTENSION );
 
 	// Edge case, file names like `.ext`.
 	if ( empty( $fname ) ) {
 		return false;
 	}
 
 	if ( $ext ) {
 		$ext = ".$ext";
 	}
 
 	$regex = '/^' . preg_quote( $fname ) . '-(?:\d+x\d+|scaled|rotated)' . preg_quote( $ext ) . '$/i';
 
 	foreach ( $files as $file ) {
 		if ( preg_match( $regex, $file ) ) {
 			return true;
 		}
 	}
 
 	return false;
 }
 
 /**
  * Create a file in the upload folder with given content.
  *
  * If there is an error, then the key 'error' will exist with the error message.
  * If success, then the key 'file' will have the unique file path, the 'url' key
  * will have the link to the new file. and the 'error' key will be set to false.
  *
  * This function will not move an uploaded file to the upload folder. It will
  * create a new file with the content in $bits parameter. If you move the upload
  * file, read the content of the uploaded file, and then you can give the
  * filename and content to this function, which will add it to the upload
  * folder.
  *
  * The permissions will be set on the new file automatically by this function.
  *
  * @since 2.0.0
  *
  * @param string      $name       Filename.
  * @param null|string $deprecated Never used. Set to null.
  * @param string      $bits       File content
  * @param string      $time       Optional. Time formatted in 'yyyy/mm'. Default null.
  * @return array {
  *     Information about the newly-uploaded file.
  *
  *     @type string       $file  Filename of the newly-uploaded file.
  *     @type string       $url   URL of the uploaded file.
  *     @type string       $type  File type.
  *     @type string|false $error Error message, if there has been an error.
  * }
  */
 function wp_upload_bits( $name, $deprecated, $bits, $time = null ) {
 	if ( ! empty( $deprecated ) ) {
 		_deprecated_argument( __FUNCTION__, '2.0.0' );
 	}
 
 	if ( empty( $name ) ) {
 		return array( 'error' => __( 'Empty filename' ) );
 	}
 
 	$wp_filetype = wp_check_filetype( $name );
 	if ( ! $wp_filetype['ext'] && ! current_user_can( 'unfiltered_upload' ) ) {
 		return array( 'error' => __( 'Sorry, this file type is not permitted for security reasons.' ) );
 	}
 
 	$upload = wp_upload_dir( $time );
 
 	if ( false !== $upload['error'] ) {
 		return $upload;
 	}
 
 	/**
 	 * Filters whether to treat the upload bits as an error.
 	 *
 	 * Returning a non-array from the filter will effectively short-circuit preparing the upload bits
 	 * and return that value instead. An error message should be returned as a string.
 	 *
 	 * @since 3.0.0
 	 *
 	 * @param array|string $upload_bits_error An array of upload bits data, or error message to return.
 	 */
 	$upload_bits_error = apply_filters(
 		'wp_upload_bits',
 		array(
 			'name' => $name,
 			'bits' => $bits,
 			'time' => $time,
 		)
 	);
 	if ( ! is_array( $upload_bits_error ) ) {
 		$upload['error'] = $upload_bits_error;
 		return $upload;
 	}
 
 	$filename = wp_unique_filename( $upload['path'], $name );
 
 	$new_file = $upload['path'] . "/$filename";
 	if ( ! wp_mkdir_p( dirname( $new_file ) ) ) {
 		if ( 0 === strpos( $upload['basedir'], ABSPATH ) ) {
 			$error_path = str_replace( ABSPATH, '', $upload['basedir'] ) . $upload['subdir'];
 		} else {
 			$error_path = wp_basename( $upload['basedir'] ) . $upload['subdir'];
 		}
 
 		$message = sprintf(
 			/* translators: %s: Directory path. */
 			__( 'Unable to create directory %s. Is its parent directory writable by the server?' ),
 			$error_path
 		);
 		return array( 'error' => $message );
 	}
 
 	$ifp = @fopen( $new_file, 'wb' );
 	if ( ! $ifp ) {
 		return array(
 			/* translators: %s: File name. */
 			'error' => sprintf( __( 'Could not write file %s' ), $new_file ),
 		);
 	}
 
 	fwrite( $ifp, $bits );
 	fclose( $ifp );
 	clearstatcache();
 
 	// Set correct file permissions.
 	$stat  = @ stat( dirname( $new_file ) );
 	$perms = $stat['mode'] & 0007777;
 	$perms = $perms & 0000666;
 	chmod( $new_file, $perms );
 	clearstatcache();
 
 	// Compute the URL.
 	$url = $upload['url'] . "/$filename";
 
 	if ( is_multisite() ) {
 		clean_dirsize_cache( $new_file );
 	}
 
 	/** This filter is documented in wp-admin/includes/file.php */
 	return apply_filters(
 		'wp_handle_upload',
 		array(
 			'file'  => $new_file,
 			'url'   => $url,
 			'type'  => $wp_filetype['type'],
 			'error' => false,
 		),
 		'sideload'
 	);
 }
 
 /**
  * Retrieve the file type based on the extension name.
  *
  * @since 2.5.0
  *
  * @param string $ext The extension to search.
  * @return string|void The file type, example: audio, video, document, spreadsheet, etc.
  */
 function wp_ext2type( $ext ) {
 	$ext = strtolower( $ext );
 
 	$ext2type = wp_get_ext_types();
 	foreach ( $ext2type as $type => $exts ) {
 		if ( in_array( $ext, $exts, true ) ) {
 			return $type;
 		}
 	}
 }
 
 /**
  * Returns first matched extension for the mime-type,
  * as mapped from wp_get_mime_types().
  *
  * @since 5.8.1
  *
  * @param string $mime_type
  *
  * @return string|false
  */
 function wp_get_default_extension_for_mime_type( $mime_type ) {
 	$extensions = explode( '|', array_search( $mime_type, wp_get_mime_types(), true ) );
 
 	if ( empty( $extensions[0] ) ) {
 		return false;
 	}
 
 	return $extensions[0];
 }
 
 /**
  * Retrieve the file type from the file name.
  *
  * You can optionally define the mime array, if needed.
  *
  * @since 2.0.4
  *
  * @param string   $filename File name or path.
  * @param string[] $mimes    Optional. Array of allowed mime types keyed by their file extension regex.
  * @return array {
  *     Values for the extension and mime type.
  *
  *     @type string|false $ext  File extension, or false if the file doesn't match a mime type.
  *     @type string|false $type File mime type, or false if the file doesn't match a mime type.
  * }
  */
 function wp_check_filetype( $filename, $mimes = null ) {
 	if ( empty( $mimes ) ) {
 		$mimes = get_allowed_mime_types();
 	}
 	$type = false;
 	$ext  = false;
 
 	foreach ( $mimes as $ext_preg => $mime_match ) {
 		$ext_preg = '!\.(' . $ext_preg . ')$!i';
 		if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
 			$type = $mime_match;
 			$ext  = $ext_matches[1];
 			break;
 		}
 	}
 
 	return compact( 'ext', 'type' );
 }
 
 /**
  * Attempt to determine the real file type of a file.
  *
  * If unable to, the file name extension will be used to determine type.
  *
  * If it's determined that the extension does not match the file's real type,
  * then the "proper_filename" value will be set with a proper filename and extension.
  *
  * Currently this function only supports renaming images validated via wp_get_image_mime().
  *
  * @since 3.0.0
  *
  * @param string   $file     Full path to the file.
  * @param string   $filename The name of the file (may differ from $file due to $file being
  *                           in a tmp directory).
  * @param string[] $mimes    Optional. Array of allowed mime types keyed by their file extension regex.
  * @return array {
  *     Values for the extension, mime type, and corrected filename.
  *
  *     @type string|false $ext             File extension, or false if the file doesn't match a mime type.
  *     @type string|false $type            File mime type, or false if the file doesn't match a mime type.
  *     @type string|false $proper_filename File name with its correct extension, or false if it cannot be determined.
  * }
  */
 function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 	$proper_filename = false;
 
 	// Do basic extension validation and MIME mapping.
 	$wp_filetype = wp_check_filetype( $filename, $mimes );
 	$ext         = $wp_filetype['ext'];
 	$type        = $wp_filetype['type'];
 
 	// We can't do any further validation without a file to work with.
 	if ( ! file_exists( $file ) ) {
 		return compact( 'ext', 'type', 'proper_filename' );
 	}
 
 	$real_mime = false;
 
 	// Validate image types.
 	if ( $type && 0 === strpos( $type, 'image/' ) ) {
 
 		// Attempt to figure out what type of image it actually is.
 		$real_mime = wp_get_image_mime( $file );
 
 		if ( $real_mime && $real_mime != $type ) {
 			/**
 			 * Filters the list mapping image mime types to their respective extensions.
 			 *
 			 * @since 3.0.0
 			 *
 			 * @param array $mime_to_ext Array of image mime types and their matching extensions.
 			 */
 			$mime_to_ext = apply_filters(
 				'getimagesize_mimes_to_exts',
 				array(
 					'image/jpeg' => 'jpg',
 					'image/png'  => 'png',
 					'image/gif'  => 'gif',
 					'image/bmp'  => 'bmp',
 					'image/tiff' => 'tif',
 					'image/webp' => 'webp',
 				)
 			);
 
 			// Replace whatever is after the last period in the filename with the correct extension.
 			if ( ! empty( $mime_to_ext[ $real_mime ] ) ) {
 				$filename_parts = explode( '.', $filename );
 				array_pop( $filename_parts );
 				$filename_parts[] = $mime_to_ext[ $real_mime ];
 				$new_filename     = implode( '.', $filename_parts );
 
 				if ( $new_filename != $filename ) {
 					$proper_filename = $new_filename; // Mark that it changed.
 				}
 				// Redefine the extension / MIME.
 				$wp_filetype = wp_check_filetype( $new_filename, $mimes );
 				$ext         = $wp_filetype['ext'];
 				$type        = $wp_filetype['type'];
 			} else {
 				// Reset $real_mime and try validating again.
 				$real_mime = false;
 			}
 		}
 	}
 
 	// Validate files that didn't get validated during previous checks.
 	if ( $type && ! $real_mime && extension_loaded( 'fileinfo' ) ) {
 		$finfo     = finfo_open( FILEINFO_MIME_TYPE );
 		$real_mime = finfo_file( $finfo, $file );
 		finfo_close( $finfo );
 
 		// fileinfo often misidentifies obscure files as one of these types.
 		$nonspecific_types = array(
 			'application/octet-stream',
 			'application/encrypted',
 			'application/CDFV2-encrypted',
 			'application/zip',
 		);
 
 		/*
 		 * If $real_mime doesn't match the content type we're expecting from the file's extension,
 		 * we need to do some additional vetting. Media types and those listed in $nonspecific_types are
 		 * allowed some leeway, but anything else must exactly match the real content type.
 		 */
 		if ( in_array( $real_mime, $nonspecific_types, true ) ) {
 			// File is a non-specific binary type. That's ok if it's a type that generally tends to be binary.
 			if ( ! in_array( substr( $type, 0, strcspn( $type, '/' ) ), array( 'application', 'video', 'audio' ), true ) ) {
 				$type = false;
 				$ext  = false;
 			}
 		} elseif ( 0 === strpos( $real_mime, 'video/' ) || 0 === strpos( $real_mime, 'audio/' ) ) {
 			/*
 			 * For these types, only the major type must match the real value.
 			 * This means that common mismatches are forgiven: application/vnd.apple.numbers is often misidentified as application/zip,
 			 * and some media files are commonly named with the wrong extension (.mov instead of .mp4)
 			 */
 			if ( substr( $real_mime, 0, strcspn( $real_mime, '/' ) ) !== substr( $type, 0, strcspn( $type, '/' ) ) ) {
 				$type = false;
 				$ext  = false;
 			}
 		} elseif ( 'text/plain' === $real_mime ) {
 			// A few common file types are occasionally detected as text/plain; allow those.
 			if ( ! in_array(
 				$type,
 				array(
 					'text/plain',
 					'text/csv',
 					'application/csv',
 					'text/richtext',
 					'text/tsv',
 					'text/vtt',
 				),
 				true
 			)
 			) {
 				$type = false;
 				$ext  = false;
 			}
 		} elseif ( 'application/csv' === $real_mime ) {
 			// Special casing for CSV files.
 			if ( ! in_array(
 				$type,
 				array(
 					'text/csv',
 					'text/plain',
 					'application/csv',
 				),
 				true
 			)
 			) {
 				$type = false;
 				$ext  = false;
 			}
 		} elseif ( 'text/rtf' === $real_mime ) {
 			// Special casing for RTF files.
 			if ( ! in_array(
 				$type,
 				array(
 					'text/rtf',
 					'text/plain',
 					'application/rtf',
 				),
 				true
 			)
 			) {
 				$type = false;
 				$ext  = false;
 			}
 		} else {
 			if ( $type !== $real_mime ) {
 				/*
 				 * Everything else including image/* and application/*:
 				 * If the real content type doesn't match the file extension, assume it's dangerous.
 				 */
 				$type = false;
 				$ext  = false;
 			}
 		}
 	}
 
 	// The mime type must be allowed.
 	if ( $type ) {
 		$allowed = get_allowed_mime_types();
 
 		if ( ! in_array( $type, $allowed, true ) ) {
 			$type = false;
 			$ext  = false;
 		}
 	}
 
 	/**
 	 * Filters the "real" file type of the given file.
 	 *
 	 * @since 3.0.0
 	 * @since 5.1.0 The $real_mime parameter was added.
 	 *
 	 * @param array        $wp_check_filetype_and_ext {
 	 *     Values for the extension, mime type, and corrected filename.
 	 *
 	 *     @type string|false $ext             File extension, or false if the file doesn't match a mime type.
 	 *     @type string|false $type            File mime type, or false if the file doesn't match a mime type.
 	 *     @type string|false $proper_filename File name with its correct extension, or false if it cannot be determined.
 	 * }
 	 * @param string       $file                      Full path to the file.
 	 * @param string       $filename                  The name of the file (may differ from $file due to
 	 *                                                $file being in a tmp directory).
 	 * @param string[]     $mimes                     Array of mime types keyed by their file extension regex.
 	 * @param string|false $real_mime                 The actual mime type or false if the type cannot be determined.
 	 */
 	return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes, $real_mime );
 }
 
 /**
  * Returns the real mime type of an image file.
  *
  * This depends on exif_imagetype() or getimagesize() to determine real mime types.
  *
  * @since 4.7.1
  * @since 5.8.0 Added support for WebP images.
  *
  * @param string $file Full path to the file.
  * @return string|false The actual mime type or false if the type cannot be determined.
  */
 function wp_get_image_mime( $file ) {
 	/*
 	 * Use exif_imagetype() to check the mimetype if available or fall back to
 	 * getimagesize() if exif isn't avaialbe. If either function throws an Exception
 	 * we assume the file could not be validated.
 	 */
 	try {
 		if ( is_callable( 'exif_imagetype' ) ) {
 			$imagetype = exif_imagetype( $file );
 			$mime      = ( $imagetype ) ? image_type_to_mime_type( $imagetype ) : false;
 		} elseif ( function_exists( 'getimagesize' ) ) {
 			// Don't silence errors when in debug mode, unless running unit tests.
 			if ( defined( 'WP_DEBUG' ) && WP_DEBUG
 				&& ! defined( 'WP_RUN_CORE_TESTS' )
 			) {
 				// Not using wp_getimagesize() here to avoid an infinite loop.
 				$imagesize = getimagesize( $file );
 			} else {
 				// phpcs:ignore WordPress.PHP.NoSilencedErrors
 				$imagesize = @getimagesize( $file );
 			}
 
 			$mime = ( isset( $imagesize['mime'] ) ) ? $imagesize['mime'] : false;
 		} else {
 			$mime = false;
 		}
 
 		if ( false !== $mime ) {
 			return $mime;
 		}
 
 		$handle = fopen( $file, 'rb' );
 		if ( false === $handle ) {
 			return false;
 		}
 
 		$magic = fread( $handle, 12 );
 		if ( false === $magic ) {
 			return false;
 		}
 
 		/*
 		 * Add WebP fallback detection when image library doesn't support WebP.
 		 * Note: detection values come from LibWebP, see
 		 * https://github.com/webmproject/libwebp/blob/master/imageio/image_dec.c#L30
 		 */
 		$magic = bin2hex( $magic );
 		if (
 			// RIFF.
 			( 0 === strpos( $magic, '52494646' ) ) &&
 			// WEBP.
 			( 16 === strpos( $magic, '57454250' ) )
 		) {
 			$mime = 'image/webp';
 		}
 
 		fclose( $handle );
 	} catch ( Exception $e ) {
 		$mime = false;
 	}
 
 	return $mime;
 }
 
 /**
  * Retrieve list of mime types and file extensions.
  *
  * @since 3.5.0
  * @since 4.2.0 Support was added for GIMP (.xcf) files.
  * @since 4.9.2 Support was added for Flac (.flac) files.
  * @since 4.9.6 Support was added for AAC (.aac) files.
  *
  * @return string[] Array of mime types keyed by the file extension regex corresponding to those types.
  */
 function wp_get_mime_types() {
 	/**
 	 * Filters the list of mime types and file extensions.
 	 *
 	 * This filter should be used to add, not remove, mime types. To remove
 	 * mime types, use the {@see 'upload_mimes'} filter.
 	 *
 	 * @since 3.5.0
 	 *
 	 * @param string[] $wp_get_mime_types Mime types keyed by the file extension regex
 	 *                                 corresponding to those types.
 	 */
 	return apply_filters(
 		'mime_types',
 		array(
 			// Image formats.
 			'jpg|jpeg|jpe'                 => 'image/jpeg',
 			'gif'                          => 'image/gif',
 			'png'                          => 'image/png',
 			'bmp'                          => 'image/bmp',
 			'tiff|tif'                     => 'image/tiff',
 			'webp'                         => 'image/webp',
 			'ico'                          => 'image/x-icon',
 			'heic'                         => 'image/heic',
 			// Video formats.
 			'asf|asx'                      => 'video/x-ms-asf',
 			'wmv'                          => 'video/x-ms-wmv',
 			'wmx'                          => 'video/x-ms-wmx',
 			'wm'                           => 'video/x-ms-wm',
 			'avi'                          => 'video/avi',
 			'divx'                         => 'video/divx',
 			'flv'                          => 'video/x-flv',
 			'mov|qt'                       => 'video/quicktime',
 			'mpeg|mpg|mpe'                 => 'video/mpeg',
 			'mp4|m4v'                      => 'video/mp4',
 			'ogv'                          => 'video/ogg',
 			'webm'                         => 'video/webm',
 			'mkv'                          => 'video/x-matroska',
 			'3gp|3gpp'                     => 'video/3gpp',  // Can also be audio.
 			'3g2|3gp2'                     => 'video/3gpp2', // Can also be audio.
 			// Text formats.
 			'txt|asc|c|cc|h|srt'           => 'text/plain',
 			'csv'                          => 'text/csv',
 			'tsv'                          => 'text/tab-separated-values',
 			'ics'                          => 'text/calendar',
 			'rtx'                          => 'text/richtext',
 			'css'                          => 'text/css',
 			'htm|html'                     => 'text/html',
 			'vtt'                          => 'text/vtt',
 			'dfxp'                         => 'application/ttaf+xml',
 			// Audio formats.
 			'mp3|m4a|m4b'                  => 'audio/mpeg',
 			'aac'                          => 'audio/aac',
 			'ra|ram'                       => 'audio/x-realaudio',
 			'wav'                          => 'audio/wav',
 			'ogg|oga'                      => 'audio/ogg',
 			'flac'                         => 'audio/flac',
 			'mid|midi'                     => 'audio/midi',
 			'wma'                          => 'audio/x-ms-wma',
 			'wax'                          => 'audio/x-ms-wax',
 			'mka'                          => 'audio/x-matroska',
 			// Misc application formats.
 			'rtf'                          => 'application/rtf',
 			'js'                           => 'application/javascript',
 			'pdf'                          => 'application/pdf',
 			'swf'                          => 'application/x-shockwave-flash',
 			'class'                        => 'application/java',
 			'tar'                          => 'application/x-tar',
 			'zip'                          => 'application/zip',
 			'gz|gzip'                      => 'application/x-gzip',
 			'rar'                          => 'application/rar',
 			'7z'                           => 'application/x-7z-compressed',
 			'exe'                          => 'application/x-msdownload',
 			'psd'                          => 'application/octet-stream',
 			'xcf'                          => 'application/octet-stream',
 			// MS Office formats.
 			'doc'                          => 'application/msword',
 			'pot|pps|ppt'                  => 'application/vnd.ms-powerpoint',
 			'wri'                          => 'application/vnd.ms-write',
 			'xla|xls|xlt|xlw'              => 'application/vnd.ms-excel',
 			'mdb'                          => 'application/vnd.ms-access',
 			'mpp'                          => 'application/vnd.ms-project',
 			'docx'                         => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
 			'docm'                         => 'application/vnd.ms-word.document.macroEnabled.12',
 			'dotx'                         => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
 			'dotm'                         => 'application/vnd.ms-word.template.macroEnabled.12',
 			'xlsx'                         => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
 			'xlsm'                         => 'application/vnd.ms-excel.sheet.macroEnabled.12',
 			'xlsb'                         => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
 			'xltx'                         => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
 			'xltm'                         => 'application/vnd.ms-excel.template.macroEnabled.12',
 			'xlam'                         => 'application/vnd.ms-excel.addin.macroEnabled.12',
 			'pptx'                         => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
 			'pptm'                         => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12',
 			'ppsx'                         => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
 			'ppsm'                         => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12',
 			'potx'                         => 'application/vnd.openxmlformats-officedocument.presentationml.template',
 			'potm'                         => 'application/vnd.ms-powerpoint.template.macroEnabled.12',
 			'ppam'                         => 'application/vnd.ms-powerpoint.addin.macroEnabled.12',
 			'sldx'                         => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
 			'sldm'                         => 'application/vnd.ms-powerpoint.slide.macroEnabled.12',
 			'onetoc|onetoc2|onetmp|onepkg' => 'application/onenote',
 			'oxps'                         => 'application/oxps',
 			'xps'                          => 'application/vnd.ms-xpsdocument',
 			// OpenOffice formats.
 			'odt'                          => 'application/vnd.oasis.opendocument.text',
 			'odp'                          => 'application/vnd.oasis.opendocument.presentation',
 			'ods'                          => 'application/vnd.oasis.opendocument.spreadsheet',
 			'odg'                          => 'application/vnd.oasis.opendocument.graphics',
 			'odc'                          => 'application/vnd.oasis.opendocument.chart',
 			'odb'                          => 'application/vnd.oasis.opendocument.database',
 			'odf'                          => 'application/vnd.oasis.opendocument.formula',
 			// WordPerfect formats.
 			'wp|wpd'                       => 'application/wordperfect',
 			// iWork formats.
 			'key'                          => 'application/vnd.apple.keynote',
 			'numbers'                      => 'application/vnd.apple.numbers',
 			'pages'                        => 'application/vnd.apple.pages',
 		)
 	);
 }
 
 /**
  * Retrieves the list of common file extensions and their types.
  *
  * @since 4.6.0
  *
  * @return array[] Multi-dimensional array of file extensions types keyed by the type of file.
  */
 function wp_get_ext_types() {
 
 	/**
 	 * Filters file type based on the extension name.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @see wp_ext2type()
 	 *
 	 * @param array[] $ext2type Multi-dimensional array of file extensions types keyed by the type of file.
 	 */
 	return apply_filters(
 		'ext2type',
 		array(
 			'image'       => array( 'jpg', 'jpeg', 'jpe', 'gif', 'png', 'bmp', 'tif', 'tiff', 'ico', 'heic', 'webp' ),
 			'audio'       => array( 'aac', 'ac3', 'aif', 'aiff', 'flac', 'm3a', 'm4a', 'm4b', 'mka', 'mp1', 'mp2', 'mp3', 'ogg', 'oga', 'ram', 'wav', 'wma' ),
 			'video'       => array( '3g2', '3gp', '3gpp', 'asf', 'avi', 'divx', 'dv', 'flv', 'm4v', 'mkv', 'mov', 'mp4', 'mpeg', 'mpg', 'mpv', 'ogm', 'ogv', 'qt', 'rm', 'vob', 'wmv' ),
 			'document'    => array( 'doc', 'docx', 'docm', 'dotm', 'odt', 'pages', 'pdf', 'xps', 'oxps', 'rtf', 'wp', 'wpd', 'psd', 'xcf' ),
 			'spreadsheet' => array( 'numbers', 'ods', 'xls', 'xlsx', 'xlsm', 'xlsb' ),
 			'interactive' => array( 'swf', 'key', 'ppt', 'pptx', 'pptm', 'pps', 'ppsx', 'ppsm', 'sldx', 'sldm', 'odp' ),
 			'text'        => array( 'asc', 'csv', 'tsv', 'txt' ),
 			'archive'     => array( 'bz2', 'cab', 'dmg', 'gz', 'rar', 'sea', 'sit', 'sqx', 'tar', 'tgz', 'zip', '7z' ),
 			'code'        => array( 'css', 'htm', 'html', 'php', 'js' ),
 		)
 	);
 }
 
 /**
  * Retrieve list of allowed mime types and file extensions.
  *
  * @since 2.8.6
  *
  * @param int|WP_User $user Optional. User to check. Defaults to current user.
  * @return string[] Array of mime types keyed by the file extension regex corresponding
  *                  to those types.
  */
 function get_allowed_mime_types( $user = null ) {
 	$t = wp_get_mime_types();
 
 	unset( $t['swf'], $t['exe'] );
 	if ( function_exists( 'current_user_can' ) ) {
 		$unfiltered = $user ? user_can( $user, 'unfiltered_html' ) : current_user_can( 'unfiltered_html' );
 	}
 
 	if ( empty( $unfiltered ) ) {
 		unset( $t['htm|html'], $t['js'] );
 	}
 
 	/**
 	 * Filters list of allowed mime types and file extensions.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param array            $t    Mime types keyed by the file extension regex corresponding to those types.
 	 * @param int|WP_User|null $user User ID, User object or null if not provided (indicates current user).
 	 */
 	return apply_filters( 'upload_mimes', $t, $user );
 }
 
 /**
  * Display "Are You Sure" message to confirm the action being taken.
  *
  * If the action has the nonce explain message, then it will be displayed
  * along with the "Are you sure?" message.
  *
  * @since 2.0.4
  *
  * @param string $action The nonce action.
  */
 function wp_nonce_ays( $action ) {
 	if ( 'log-out' === $action ) {
 		$html = sprintf(
 			/* translators: %s: Site title. */
 			__( 'You are attempting to log out of %s' ),
 			get_bloginfo( 'name' )
 		);
 		$html       .= '</p><p>';
 		$redirect_to = isset( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : '';
 		$html       .= sprintf(
 			/* translators: %s: Logout URL. */
 			__( 'Do you really want to <a href="%s">log out</a>?' ),
 			wp_logout_url( $redirect_to )
 		);
 	} else {
 		$html = __( 'The link you followed has expired.' );
 		if ( wp_get_referer() ) {
 			$html .= '</p><p>';
 			$html .= sprintf(
 				'<a href="%s">%s</a>',
 				esc_url( remove_query_arg( 'updated', wp_get_referer() ) ),
 				__( 'Please try again.' )
 			);
 		}
 	}
 
 	wp_die( $html, __( 'Something went wrong.' ), 403 );
 }
 
 /**
  * Kills WordPress execution and displays HTML page with an error message.
  *
  * This function complements the `die()` PHP function. The difference is that
  * HTML will be displayed to the user. It is recommended to use this function
  * only when the execution should not continue any further. It is not recommended
  * to call this function very often, and try to handle as many errors as possible
  * silently or more gracefully.
  *
  * As a shorthand, the desired HTTP response code may be passed as an integer to
  * the `$title` parameter (the default title would apply) or the `$args` parameter.
  *
  * @since 2.0.4
  * @since 4.1.0 The `$title` and `$args` parameters were changed to optionally accept
  *              an integer to be used as the response code.
  * @since 5.1.0 The `$link_url`, `$link_text`, and `$exit` arguments were added.
  * @since 5.3.0 The `$charset` argument was added.
  * @since 5.5.0 The `$text_direction` argument has a priority over get_language_attributes()
  *              in the default handler.
  *
  * @global WP_Query $wp_query WordPress Query object.
  *
  * @param string|WP_Error  $message Optional. Error message. If this is a WP_Error object,
  *                                  and not an Ajax or XML-RPC request, the error's messages are used.
  *                                  Default empty.
  * @param string|int       $title   Optional. Error title. If `$message` is a `WP_Error` object,
  *                                  error data with the key 'title' may be used to specify the title.
  *                                  If `$title` is an integer, then it is treated as the response
  *                                  code. Default empty.
  * @param string|array|int $args {
  *     Optional. Arguments to control behavior. If `$args` is an integer, then it is treated
  *     as the response code. Default empty array.
  *
  *     @type int    $response       The HTTP response code. Default 200 for Ajax requests, 500 otherwise.
  *     @type string $link_url       A URL to include a link to. Only works in combination with $link_text.
  *                                  Default empty string.
  *     @type string $link_text      A label for the link to include. Only works in combination with $link_url.
  *                                  Default empty string.
  *     @type bool   $back_link      Whether to include a link to go back. Default false.
  *     @type string $text_direction The text direction. This is only useful internally, when WordPress is still
  *                                  loading and the site's locale is not set up yet. Accepts 'rtl' and 'ltr'.
  *                                  Default is the value of is_rtl().
  *     @type string $charset        Character set of the HTML output. Default 'utf-8'.
  *     @type string $code           Error code to use. Default is 'wp_die', or the main error code if $message
  *                                  is a WP_Error.
  *     @type bool   $exit           Whether to exit the process after completion. Default true.
  * }
  */
 function wp_die( $message = '', $title = '', $args = array() ) {
 	global $wp_query;
 
 	if ( is_int( $args ) ) {
 		$args = array( 'response' => $args );
 	} elseif ( is_int( $title ) ) {
 		$args  = array( 'response' => $title );
 		$title = '';
 	}
 
 	if ( wp_doing_ajax() ) {
 		/**
 		 * Filters the callback for killing WordPress execution for Ajax requests.
 		 *
 		 * @since 3.4.0
 		 *
 		 * @param callable $function Callback function name.
 		 */
 		$function = apply_filters( 'wp_die_ajax_handler', '_ajax_wp_die_handler' );
 	} elseif ( wp_is_json_request() ) {
 		/**
 		 * Filters the callback for killing WordPress execution for JSON requests.
 		 *
 		 * @since 5.1.0
 		 *
 		 * @param callable $function Callback function name.
 		 */
 		$function = apply_filters( 'wp_die_json_handler', '_json_wp_die_handler' );
 	} elseif ( defined( 'REST_REQUEST' ) && REST_REQUEST && wp_is_jsonp_request() ) {
 		/**
 		 * Filters the callback for killing WordPress execution for JSONP REST requests.
 		 *
 		 * @since 5.2.0
 		 *
 		 * @param callable $function Callback function name.
 		 */
 		$function = apply_filters( 'wp_die_jsonp_handler', '_jsonp_wp_die_handler' );
 	} elseif ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) {
 		/**
 		 * Filters the callback for killing WordPress execution for XML-RPC requests.
 		 *
 		 * @since 3.4.0
 		 *
 		 * @param callable $function Callback function name.
 		 */
 		$function = apply_filters( 'wp_die_xmlrpc_handler', '_xmlrpc_wp_die_handler' );
 	} elseif ( wp_is_xml_request()
 		|| isset( $wp_query ) &&
 			( function_exists( 'is_feed' ) && is_feed()
 			|| function_exists( 'is_comment_feed' ) && is_comment_feed()
 			|| function_exists( 'is_trackback' ) && is_trackback() ) ) {
 		/**
 		 * Filters the callback for killing WordPress execution for XML requests.
 		 *
 		 * @since 5.2.0
 		 *
 		 * @param callable $function Callback function name.
 		 */
 		$function = apply_filters( 'wp_die_xml_handler', '_xml_wp_die_handler' );
 	} else {
 		/**
 		 * Filters the callback for killing WordPress execution for all non-Ajax, non-JSON, non-XML requests.
 		 *
 		 * @since 3.0.0
 		 *
 		 * @param callable $function Callback function name.
 		 */
 		$function = apply_filters( 'wp_die_handler', '_default_wp_die_handler' );
 	}
 
 	call_user_func( $function, $message, $title, $args );
 }
 
 /**
  * Kills WordPress execution and displays HTML page with an error message.
  *
  * This is the default handler for wp_die(). If you want a custom one,
  * you can override this using the {@see 'wp_die_handler'} filter in wp_die().
  *
  * @since 3.0.0
  * @access private
  *
  * @param string|WP_Error $message Error message or WP_Error object.
  * @param string          $title   Optional. Error title. Default empty.
  * @param string|array    $args    Optional. Arguments to control behavior. Default empty array.
  */
 function _default_wp_die_handler( $message, $title = '', $args = array() ) {
 	list( $message, $title, $parsed_args ) = _wp_die_process_input( $message, $title, $args );
 
 	if ( is_string( $message ) ) {
 		if ( ! empty( $parsed_args['additional_errors'] ) ) {
 			$message = array_merge(
 				array( $message ),
 				wp_list_pluck( $parsed_args['additional_errors'], 'message' )
 			);
 			$message = "<ul>\n\t\t<li>" . implode( "</li>\n\t\t<li>", $message ) . "</li>\n\t</ul>";
 		}
 
 		$message = sprintf(
 			'<div class="wp-die-message">%s</div>',
 			$message
 		);
 	}
 
 	$have_gettext = function_exists( '__' );
 
 	if ( ! empty( $parsed_args['link_url'] ) && ! empty( $parsed_args['link_text'] ) ) {
 		$link_url = $parsed_args['link_url'];
 		if ( function_exists( 'esc_url' ) ) {
 			$link_url = esc_url( $link_url );
 		}
 		$link_text = $parsed_args['link_text'];
 		$message  .= "\n<p><a href='{$link_url}'>{$link_text}</a></p>";
 	}
 
 	if ( isset( $parsed_args['back_link'] ) && $parsed_args['back_link'] ) {
 		$back_text = $have_gettext ? __( '&laquo; Back' ) : '&laquo; Back';
 		$message  .= "\n<p><a href='javascript:history.back()'>$back_text</a></p>";
 	}
 
 	if ( ! did_action( 'admin_head' ) ) :
 		if ( ! headers_sent() ) {
 			header( "Content-Type: text/html; charset={$parsed_args['charset']}" );
 			status_header( $parsed_args['response'] );
 			nocache_headers();
 		}
 
 		$text_direction = $parsed_args['text_direction'];
 		$dir_attr       = "dir='$text_direction'";
 
 		// If `text_direction` was not explicitly passed,
 		// use get_language_attributes() if available.
 		if ( empty( $args['text_direction'] )
 			&& function_exists( 'language_attributes' ) && function_exists( 'is_rtl' )
 		) {
 			$dir_attr = get_language_attributes();
 		}
 		?>
 <!DOCTYPE html>
 <html <?php echo $dir_attr; ?>>
 <head>
 	<meta http-equiv="Content-Type" content="text/html; charset=<?php echo $parsed_args['charset']; ?>" />
 	<meta name="viewport" content="width=device-width">
 		<?php
 		if ( function_exists( 'wp_robots' ) && function_exists( 'wp_robots_no_robots' ) && function_exists( 'add_filter' ) ) {
 			add_filter( 'wp_robots', 'wp_robots_no_robots' );
 			wp_robots();
 		}
 		?>
 	<title><?php echo $title; ?></title>
 	<style type="text/css">
 		html {
 			background: #f1f1f1;
 		}
 		body {
 			background: #fff;
 			border: 1px solid #ccd0d4;
 			color: #444;
 			font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
 			margin: 2em auto;
 			padding: 1em 2em;
 			max-width: 700px;
 			-webkit-box-shadow: 0 1px 1px rgba(0, 0, 0, .04);
 			box-shadow: 0 1px 1px rgba(0, 0, 0, .04);
 		}
 		h1 {
 			border-bottom: 1px solid #dadada;
 			clear: both;
 			color: #666;
 			font-size: 24px;
 			margin: 30px 0 0 0;
 			padding: 0;
 			padding-bottom: 7px;
 		}
 		#error-page {
 			margin-top: 50px;
 		}
 		#error-page p,
 		#error-page .wp-die-message {
 			font-size: 14px;
 			line-height: 1.5;
 			margin: 25px 0 20px;
 		}
 		#error-page code {
 			font-family: Consolas, Monaco, monospace;
 		}
 		ul li {
 			margin-bottom: 10px;
 			font-size: 14px ;
 		}
 		a {
 			color: #0073aa;
 		}
 		a:hover,
 		a:active {
 			color: #006799;
 		}
 		a:focus {
 			color: #124964;
 			-webkit-box-shadow:
 				0 0 0 1px #5b9dd9,
 				0 0 2px 1px rgba(30, 140, 190, 0.8);
 			box-shadow:
 				0 0 0 1px #5b9dd9,
 				0 0 2px 1px rgba(30, 140, 190, 0.8);
 			outline: none;
 		}
 		.button {
 			background: #f3f5f6;
 			border: 1px solid #016087;
 			color: #016087;
 			display: inline-block;
 			text-decoration: none;
 			font-size: 13px;
 			line-height: 2;
 			height: 28px;
 			margin: 0;
 			padding: 0 10px 1px;
 			cursor: pointer;
 			-webkit-border-radius: 3px;
 			-webkit-appearance: none;
 			border-radius: 3px;
 			white-space: nowrap;
 			-webkit-box-sizing: border-box;
 			-moz-box-sizing:    border-box;
 			box-sizing:         border-box;
 
 			vertical-align: top;
 		}
 
 		.button.button-large {
 			line-height: 2.30769231;
 			min-height: 32px;
 			padding: 0 12px;
 		}
 
 		.button:hover,
 		.button:focus {
 			background: #f1f1f1;
 		}
 
 		.button:focus {
 			background: #f3f5f6;
 			border-color: #007cba;
 			-webkit-box-shadow: 0 0 0 1px #007cba;
 			box-shadow: 0 0 0 1px #007cba;
 			color: #016087;
 			outline: 2px solid transparent;
 			outline-offset: 0;
 		}
 
 		.button:active {
 			background: #f3f5f6;
 			border-color: #7e8993;
 			-webkit-box-shadow: none;
 			box-shadow: none;
 		}
 
 		<?php
 		if ( 'rtl' === $text_direction ) {
 			echo 'body { font-family: Tahoma, Arial; }';
 		}
 		?>
 	</style>
 </head>
 <body id="error-page">
 <?php endif; // ! did_action( 'admin_head' ) ?>
 	<?php echo $message; ?>
 </body>
 </html>
 	<?php
 	if ( $parsed_args['exit'] ) {
 		die();
 	}
 }
 
 /**
  * Kills WordPress execution and displays Ajax response with an error message.
  *
  * This is the handler for wp_die() when processing Ajax requests.
  *
  * @since 3.4.0
  * @access private
  *
  * @param string       $message Error message.
  * @param string       $title   Optional. Error title (unused). Default empty.
  * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
  */
 function _ajax_wp_die_handler( $message, $title = '', $args = array() ) {
 	// Set default 'response' to 200 for Ajax requests.
 	$args = wp_parse_args(
 		$args,
 		array( 'response' => 200 )
 	);
 
 	list( $message, $title, $parsed_args ) = _wp_die_process_input( $message, $title, $args );
 
 	if ( ! headers_sent() ) {
 		// This is intentional. For backward-compatibility, support passing null here.
 		if ( null !== $args['response'] ) {
 			status_header( $parsed_args['response'] );
 		}
 		nocache_headers();
 	}
 
 	if ( is_scalar( $message ) ) {
 		$message = (string) $message;
 	} else {
 		$message = '0';
 	}
 
 	if ( $parsed_args['exit'] ) {
 		die( $message );
 	}
 
 	echo $message;
 }
 
 /**
  * Kills WordPress execution and displays JSON response with an error message.
  *
  * This is the handler for wp_die() when processing JSON requests.
  *
  * @since 5.1.0
  * @access private
  *
  * @param string       $message Error message.
  * @param string       $title   Optional. Error title. Default empty.
  * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
  */
 function _json_wp_die_handler( $message, $title = '', $args = array() ) {
 	list( $message, $title, $parsed_args ) = _wp_die_process_input( $message, $title, $args );
 
 	$data = array(
 		'code'              => $parsed_args['code'],
 		'message'           => $message,
 		'data'              => array(
 			'status' => $parsed_args['response'],
 		),
 		'additional_errors' => $parsed_args['additional_errors'],
 	);
 
 	if ( ! headers_sent() ) {
 		header( "Content-Type: application/json; charset={$parsed_args['charset']}" );
 		if ( null !== $parsed_args['response'] ) {
 			status_header( $parsed_args['response'] );
 		}
 		nocache_headers();
 	}
 
 	echo wp_json_encode( $data );
 	if ( $parsed_args['exit'] ) {
 		die();
 	}
 }
 
 /**
  * Kills WordPress execution and displays JSONP response with an error message.
  *
  * This is the handler for wp_die() when processing JSONP requests.
  *
  * @since 5.2.0
  * @access private
  *
  * @param string       $message Error message.
  * @param string       $title   Optional. Error title. Default empty.
  * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
  */
 function _jsonp_wp_die_handler( $message, $title = '', $args = array() ) {
 	list( $message, $title, $parsed_args ) = _wp_die_process_input( $message, $title, $args );
 
 	$data = array(
 		'code'              => $parsed_args['code'],
 		'message'           => $message,
 		'data'              => array(
 			'status' => $parsed_args['response'],
 		),
 		'additional_errors' => $parsed_args['additional_errors'],
 	);
 
 	if ( ! headers_sent() ) {
 		header( "Content-Type: application/javascript; charset={$parsed_args['charset']}" );
 		header( 'X-Content-Type-Options: nosniff' );
 		header( 'X-Robots-Tag: noindex' );
 		if ( null !== $parsed_args['response'] ) {
 			status_header( $parsed_args['response'] );
 		}
 		nocache_headers();
 	}
 
 	$result         = wp_json_encode( $data );
 	$jsonp_callback = $_GET['_jsonp'];
 	echo '/**/' . $jsonp_callback . '(' . $result . ')';
 	if ( $parsed_args['exit'] ) {
 		die();
 	}
 }
 
 /**
  * Kills WordPress execution and displays XML response with an error message.
  *
  * This is the handler for wp_die() when processing XMLRPC requests.
  *
  * @since 3.2.0
  * @access private
  *
  * @global wp_xmlrpc_server $wp_xmlrpc_server
  *
  * @param string       $message Error message.
  * @param string       $title   Optional. Error title. Default empty.
  * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
  */
 function _xmlrpc_wp_die_handler( $message, $title = '', $args = array() ) {
 	global $wp_xmlrpc_server;
 
 	list( $message, $title, $parsed_args ) = _wp_die_process_input( $message, $title, $args );
 
 	if ( ! headers_sent() ) {
 		nocache_headers();
 	}
 
 	if ( $wp_xmlrpc_server ) {
 		$error = new IXR_Error( $parsed_args['response'], $message );
 		$wp_xmlrpc_server->output( $error->getXml() );
 	}
 	if ( $parsed_args['exit'] ) {
 		die();
 	}
 }
 
 /**
  * Kills WordPress execution and displays XML response with an error message.
  *
  * This is the handler for wp_die() when processing XML requests.
  *
  * @since 5.2.0
  * @access private
  *
  * @param string       $message Error message.
  * @param string       $title   Optional. Error title. Default empty.
  * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
  */
 function _xml_wp_die_handler( $message, $title = '', $args = array() ) {
 	list( $message, $title, $parsed_args ) = _wp_die_process_input( $message, $title, $args );
 
 	$message = htmlspecialchars( $message );
 	$title   = htmlspecialchars( $title );
 
 	$xml = <<<EOD
 <error>
     <code>{$parsed_args['code']}</code>
     <title><![CDATA[{$title}]]></title>
     <message><![CDATA[{$message}]]></message>
     <data>
         <status>{$parsed_args['response']}</status>
     </data>
 </error>
 
 EOD;
 
 	if ( ! headers_sent() ) {
 		header( "Content-Type: text/xml; charset={$parsed_args['charset']}" );
 		if ( null !== $parsed_args['response'] ) {
 			status_header( $parsed_args['response'] );
 		}
 		nocache_headers();
 	}
 
 	echo $xml;
 	if ( $parsed_args['exit'] ) {
 		die();
 	}
 }
 
 /**
  * Kills WordPress execution and displays an error message.
  *
  * This is the handler for wp_die() when processing APP requests.
  *
  * @since 3.4.0
  * @since 5.1.0 Added the $title and $args parameters.
  * @access private
  *
  * @param string       $message Optional. Response to print. Default empty.
  * @param string       $title   Optional. Error title (unused). Default empty.
  * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
  */
 function _scalar_wp_die_handler( $message = '', $title = '', $args = array() ) {
 	list( $message, $title, $parsed_args ) = _wp_die_process_input( $message, $title, $args );
 
 	if ( $parsed_args['exit'] ) {
 		if ( is_scalar( $message ) ) {
 			die( (string) $message );
 		}
 		die();
 	}
 
 	if ( is_scalar( $message ) ) {
 		echo (string) $message;
 	}
 }
 
 /**
  * Processes arguments passed to wp_die() consistently for its handlers.
  *
  * @since 5.1.0
  * @access private
  *
  * @param string|WP_Error $message Error message or WP_Error object.
  * @param string          $title   Optional. Error title. Default empty.
  * @param string|array    $args    Optional. Arguments to control behavior. Default empty array.
  * @return array {
  *     Processed arguments.
  *
  *     @type string $0 Error message.
  *     @type string $1 Error title.
  *     @type array  $2 Arguments to control behavior.
  * }
  */
 function _wp_die_process_input( $message, $title = '', $args = array() ) {
 	$defaults = array(
 		'response'          => 0,
 		'code'              => '',
 		'exit'              => true,
 		'back_link'         => false,
 		'link_url'          => '',
 		'link_text'         => '',
 		'text_direction'    => '',
 		'charset'           => 'utf-8',
 		'additional_errors' => array(),
 	);
 
 	$args = wp_parse_args( $args, $defaults );
 
 	if ( function_exists( 'is_wp_error' ) && is_wp_error( $message ) ) {
 		if ( ! empty( $message->errors ) ) {
 			$errors = array();
 			foreach ( (array) $message->errors as $error_code => $error_messages ) {
 				foreach ( (array) $error_messages as $error_message ) {
 					$errors[] = array(
 						'code'    => $error_code,
 						'message' => $error_message,
 						'data'    => $message->get_error_data( $error_code ),
 					);
 				}
 			}
 
 			$message = $errors[0]['message'];
 			if ( empty( $args['code'] ) ) {
 				$args['code'] = $errors[0]['code'];
 			}
 			if ( empty( $args['response'] ) && is_array( $errors[0]['data'] ) && ! empty( $errors[0]['data']['status'] ) ) {
 				$args['response'] = $errors[0]['data']['status'];
 			}
 			if ( empty( $title ) && is_array( $errors[0]['data'] ) && ! empty( $errors[0]['data']['title'] ) ) {
 				$title = $errors[0]['data']['title'];
 			}
 
 			unset( $errors[0] );
 			$args['additional_errors'] = array_values( $errors );
 		} else {
 			$message = '';
 		}
 	}
 
 	$have_gettext = function_exists( '__' );
 
 	// The $title and these specific $args must always have a non-empty value.
 	if ( empty( $args['code'] ) ) {
 		$args['code'] = 'wp_die';
 	}
 	if ( empty( $args['response'] ) ) {
 		$args['response'] = 500;
 	}
 	if ( empty( $title ) ) {
 		$title = $have_gettext ? __( 'WordPress &rsaquo; Error' ) : 'WordPress &rsaquo; Error';
 	}
 	if ( empty( $args['text_direction'] ) || ! in_array( $args['text_direction'], array( 'ltr', 'rtl' ), true ) ) {
 		$args['text_direction'] = 'ltr';
 		if ( function_exists( 'is_rtl' ) && is_rtl() ) {
 			$args['text_direction'] = 'rtl';
 		}
 	}
 
 	if ( ! empty( $args['charset'] ) ) {
 		$args['charset'] = _canonical_charset( $args['charset'] );
 	}
 
 	return array( $message, $title, $args );
 }
 
 /**
  * Encode a variable into JSON, with some sanity checks.
  *
  * @since 4.1.0
  * @since 5.3.0 No longer handles support for PHP < 5.6.
  *
  * @param mixed $data    Variable (usually an array or object) to encode as JSON.
  * @param int   $options Optional. Options to be passed to json_encode(). Default 0.
  * @param int   $depth   Optional. Maximum depth to walk through $data. Must be
  *                       greater than 0. Default 512.
  * @return string|false The JSON encoded string, or false if it cannot be encoded.
  */
 function wp_json_encode( $data, $options = 0, $depth = 512 ) {
 	$json = json_encode( $data, $options, $depth );
 
 	// If json_encode() was successful, no need to do more sanity checking.
 	if ( false !== $json ) {
 		return $json;
 	}
 
 	try {
 		$data = _wp_json_sanity_check( $data, $depth );
 	} catch ( Exception $e ) {
 		return false;
 	}
 
 	return json_encode( $data, $options, $depth );
 }
 
 /**
  * Perform sanity checks on data that shall be encoded to JSON.
  *
  * @ignore
  * @since 4.1.0
  * @access private
  *
  * @see wp_json_encode()
  *
  * @throws Exception If depth limit is reached.
  *
  * @param mixed $data  Variable (usually an array or object) to encode as JSON.
  * @param int   $depth Maximum depth to walk through $data. Must be greater than 0.
  * @return mixed The sanitized data that shall be encoded to JSON.
  */
 function _wp_json_sanity_check( $data, $depth ) {
 	if ( $depth < 0 ) {
 		throw new Exception( 'Reached depth limit' );
 	}
 
 	if ( is_array( $data ) ) {
 		$output = array();
 		foreach ( $data as $id => $el ) {
 			// Don't forget to sanitize the ID!
 			if ( is_string( $id ) ) {
 				$clean_id = _wp_json_convert_string( $id );
 			} else {
 				$clean_id = $id;
 			}
 
 			// Check the element type, so that we're only recursing if we really have to.
 			if ( is_array( $el ) || is_object( $el ) ) {
 				$output[ $clean_id ] = _wp_json_sanity_check( $el, $depth - 1 );
 			} elseif ( is_string( $el ) ) {
 				$output[ $clean_id ] = _wp_json_convert_string( $el );
 			} else {
 				$output[ $clean_id ] = $el;
 			}
 		}
 	} elseif ( is_object( $data ) ) {
 		$output = new stdClass;
 		foreach ( $data as $id => $el ) {
 			if ( is_string( $id ) ) {
 				$clean_id = _wp_json_convert_string( $id );
 			} else {
 				$clean_id = $id;
 			}
 
 			if ( is_array( $el ) || is_object( $el ) ) {
 				$output->$clean_id = _wp_json_sanity_check( $el, $depth - 1 );
 			} elseif ( is_string( $el ) ) {
 				$output->$clean_id = _wp_json_convert_string( $el );
 			} else {
 				$output->$clean_id = $el;
 			}
 		}
 	} elseif ( is_string( $data ) ) {
 		return _wp_json_convert_string( $data );
 	} else {
 		return $data;
 	}
 
 	return $output;
 }
 
 /**
  * Convert a string to UTF-8, so that it can be safely encoded to JSON.
  *
  * @ignore
  * @since 4.1.0
  * @access private
  *
  * @see _wp_json_sanity_check()
  *
  * @param string $string The string which is to be converted.
  * @return string The checked string.
  */
 function _wp_json_convert_string( $string ) {
 	static $use_mb = null;
 	if ( is_null( $use_mb ) ) {
 		$use_mb = function_exists( 'mb_convert_encoding' );
 	}
 
 	if ( $use_mb ) {
 		$encoding = mb_detect_encoding( $string, mb_detect_order(), true );
 		if ( $encoding ) {
 			return mb_convert_encoding( $string, 'UTF-8', $encoding );
 		} else {
 			return mb_convert_encoding( $string, 'UTF-8', 'UTF-8' );
 		}
 	} else {
 		return wp_check_invalid_utf8( $string, true );
 	}
 }
 
 /**
  * Prepares response data to be serialized to JSON.
  *
  * This supports the JsonSerializable interface for PHP 5.2-5.3 as well.
  *
  * @ignore
  * @since 4.4.0
  * @deprecated 5.3.0 This function is no longer needed as support for PHP 5.2-5.3
  *                   has been dropped.
  * @access private
  *
  * @param mixed $data Native representation.
  * @return bool|int|float|null|string|array Data ready for `json_encode()`.
  */
 function _wp_json_prepare_data( $data ) {
 	_deprecated_function( __FUNCTION__, '5.3.0' );
 	return $data;
 }
 
 /**
  * Send a JSON response back to an Ajax request.
  *
  * @since 3.5.0
  * @since 4.7.0 The `$status_code` parameter was added.
  * @since 5.6.0 The `$options` parameter was added.
  *
  * @param mixed $response    Variable (usually an array or object) to encode as JSON,
  *                           then print and die.
  * @param int   $status_code Optional. The HTTP status code to output. Default null.
  * @param int   $options     Optional. Options to be passed to json_encode(). Default 0.
  */
 function wp_send_json( $response, $status_code = null, $options = 0 ) {
 	if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
 		_doing_it_wrong(
 			__FUNCTION__,
 			sprintf(
 				/* translators: 1: WP_REST_Response, 2: WP_Error */
 				__( 'Return a %1$s or %2$s object from your callback when using the REST API.' ),
 				'WP_REST_Response',
 				'WP_Error'
 			),
 			'5.5.0'
 		);
 	}
 
 	if ( ! headers_sent() ) {
 		header( 'Content-Type: application/json; charset=' . get_option( 'blog_charset' ) );
 		if ( null !== $status_code ) {
 			status_header( $status_code );
 		}
 	}
 
 	echo wp_json_encode( $response, $options );
 
 	if ( wp_doing_ajax() ) {
 		wp_die(
 			'',
 			'',
 			array(
 				'response' => null,
 			)
 		);
 	} else {
 		die;
 	}
 }
 
 /**
  * Send a JSON response back to an Ajax request, indicating success.
  *
  * @since 3.5.0
  * @since 4.7.0 The `$status_code` parameter was added.
  * @since 5.6.0 The `$options` parameter was added.
  *
  * @param mixed $data        Optional. Data to encode as JSON, then print and die. Default null.
  * @param int   $status_code Optional. The HTTP status code to output. Default null.
  * @param int   $options     Optional. Options to be passed to json_encode(). Default 0.
  */
 function wp_send_json_success( $data = null, $status_code = null, $options = 0 ) {
 	$response = array( 'success' => true );
 
 	if ( isset( $data ) ) {
 		$response['data'] = $data;
 	}
 
 	wp_send_json( $response, $status_code, $options );
 }
 
 /**
  * Send a JSON response back to an Ajax request, indicating failure.
  *
  * If the `$data` parameter is a WP_Error object, the errors
  * within the object are processed and output as an array of error
  * codes and corresponding messages. All other types are output
  * without further processing.
  *
  * @since 3.5.0
  * @since 4.1.0 The `$data` parameter is now processed if a WP_Error object is passed in.
  * @since 4.7.0 The `$status_code` parameter was added.
  * @since 5.6.0 The `$options` parameter was added.
  *
  * @param mixed $data        Optional. Data to encode as JSON, then print and die. Default null.
  * @param int   $status_code Optional. The HTTP status code to output. Default null.
  * @param int   $options     Optional. Options to be passed to json_encode(). Default 0.
  */
 function wp_send_json_error( $data = null, $status_code = null, $options = 0 ) {
 	$response = array( 'success' => false );
 
 	if ( isset( $data ) ) {
 		if ( is_wp_error( $data ) ) {
 			$result = array();
 			foreach ( $data->errors as $code => $messages ) {
 				foreach ( $messages as $message ) {
 					$result[] = array(
 						'code'    => $code,
 						'message' => $message,
 					);
 				}
 			}
 
 			$response['data'] = $result;
 		} else {
 			$response['data'] = $data;
 		}
 	}
 
 	wp_send_json( $response, $status_code, $options );
 }
 
 /**
  * Checks that a JSONP callback is a valid JavaScript callback name.
  *
  * Only allows alphanumeric characters and the dot character in callback
  * function names. This helps to mitigate XSS attacks caused by directly
  * outputting user input.
  *
  * @since 4.6.0
  *
  * @param string $callback Supplied JSONP callback function name.
  * @return bool Whether the callback function name is valid.
  */
 function wp_check_jsonp_callback( $callback ) {
 	if ( ! is_string( $callback ) ) {
 		return false;
 	}
 
 	preg_replace( '/[^\w\.]/', '', $callback, -1, $illegal_char_count );
 
 	return 0 === $illegal_char_count;
 }
 
 /**
  * Retrieve the WordPress home page URL.
  *
  * If the constant named 'WP_HOME' exists, then it will be used and returned
  * by the function. This can be used to counter the redirection on your local
  * development environment.
  *
  * @since 2.2.0
  * @access private
  *
  * @see WP_HOME
  *
  * @param string $url URL for the home location.
  * @return string Homepage location.
  */
 function _config_wp_home( $url = '' ) {
 	if ( defined( 'WP_HOME' ) ) {
 		return untrailingslashit( WP_HOME );
 	}
 	return $url;
 }
 
 /**
  * Retrieve the WordPress site URL.
  *
  * If the constant named 'WP_SITEURL' is defined, then the value in that
  * constant will always be returned. This can be used for debugging a site
  * on your localhost while not having to change the database to your URL.
  *
  * @since 2.2.0
  * @access private
  *
  * @see WP_SITEURL
  *
  * @param string $url URL to set the WordPress site location.
  * @return string The WordPress Site URL.
  */
 function _config_wp_siteurl( $url = '' ) {
 	if ( defined( 'WP_SITEURL' ) ) {
 		return untrailingslashit( WP_SITEURL );
 	}
 	return $url;
 }
 
 /**
  * Delete the fresh site option.
  *
  * @since 4.7.0
  * @access private
  */
 function _delete_option_fresh_site() {
 	update_option( 'fresh_site', '0' );
 }
 
 /**
  * Set the localized direction for MCE plugin.
  *
  * Will only set the direction to 'rtl', if the WordPress locale has
  * the text direction set to 'rtl'.
  *
  * Fills in the 'directionality' setting, enables the 'directionality'
  * plugin, and adds the 'ltr' button to 'toolbar1', formerly
  * 'theme_advanced_buttons1' array keys. These keys are then returned
  * in the $mce_init (TinyMCE settings) array.
  *
  * @since 2.1.0
  * @access private
  *
  * @param array $mce_init MCE settings array.
  * @return array Direction set for 'rtl', if needed by locale.
  */
 function _mce_set_direction( $mce_init ) {
 	if ( is_rtl() ) {
 		$mce_init['directionality'] = 'rtl';
 		$mce_init['rtl_ui']         = true;
 
 		if ( ! empty( $mce_init['plugins'] ) && strpos( $mce_init['plugins'], 'directionality' ) === false ) {
 			$mce_init['plugins'] .= ',directionality';
 		}
 
 		if ( ! empty( $mce_init['toolbar1'] ) && ! preg_match( '/\bltr\b/', $mce_init['toolbar1'] ) ) {
 			$mce_init['toolbar1'] .= ',ltr';
 		}
 	}
 
 	return $mce_init;
 }
 
 
 /**
  * Convert smiley code to the icon graphic file equivalent.
  *
  * You can turn off smilies, by going to the write setting screen and unchecking
  * the box, or by setting 'use_smilies' option to false or removing the option.
  *
  * Plugins may override the default smiley list by setting the $wpsmiliestrans
  * to an array, with the key the code the blogger types in and the value the
  * image file.
  *
  * The $wp_smiliessearch global is for the regular expression and is set each
  * time the function is called.
  *
  * The full list of smilies can be found in the function and won't be listed in
  * the description. Probably should create a Codex page for it, so that it is
  * available.
  *
  * @global array $wpsmiliestrans
  * @global array $wp_smiliessearch
  *
  * @since 2.2.0
  */
 function smilies_init() {
 	global $wpsmiliestrans, $wp_smiliessearch;
 
 	// Don't bother setting up smilies if they are disabled.
 	if ( ! get_option( 'use_smilies' ) ) {
 		return;
 	}
 
 	if ( ! isset( $wpsmiliestrans ) ) {
 		$wpsmiliestrans = array(
 			':mrgreen:' => 'mrgreen.png',
 			':neutral:' => "\xf0\x9f\x98\x90",
 			':twisted:' => "\xf0\x9f\x98\x88",
 			':arrow:'   => "\xe2\x9e\xa1",
 			':shock:'   => "\xf0\x9f\x98\xaf",
 			':smile:'   => "\xf0\x9f\x99\x82",
 			':???:'     => "\xf0\x9f\x98\x95",
 			':cool:'    => "\xf0\x9f\x98\x8e",
 			':evil:'    => "\xf0\x9f\x91\xbf",
 			':grin:'    => "\xf0\x9f\x98\x80",
 			':idea:'    => "\xf0\x9f\x92\xa1",
 			':oops:'    => "\xf0\x9f\x98\xb3",
 			':razz:'    => "\xf0\x9f\x98\x9b",
 			':roll:'    => "\xf0\x9f\x99\x84",
 			':wink:'    => "\xf0\x9f\x98\x89",
 			':cry:'     => "\xf0\x9f\x98\xa5",
 			':eek:'     => "\xf0\x9f\x98\xae",
 			':lol:'     => "\xf0\x9f\x98\x86",
 			':mad:'     => "\xf0\x9f\x98\xa1",
 			':sad:'     => "\xf0\x9f\x99\x81",
 			'8-)'       => "\xf0\x9f\x98\x8e",
 			'8-O'       => "\xf0\x9f\x98\xaf",
 			':-('       => "\xf0\x9f\x99\x81",
 			':-)'       => "\xf0\x9f\x99\x82",
 			':-?'       => "\xf0\x9f\x98\x95",
 			':-D'       => "\xf0\x9f\x98\x80",
 			':-P'       => "\xf0\x9f\x98\x9b",
 			':-o'       => "\xf0\x9f\x98\xae",
 			':-x'       => "\xf0\x9f\x98\xa1",
 			':-|'       => "\xf0\x9f\x98\x90",
 			';-)'       => "\xf0\x9f\x98\x89",
 			// This one transformation breaks regular text with frequency.
 			//     '8)' => "\xf0\x9f\x98\x8e",
 			'8O'        => "\xf0\x9f\x98\xaf",
 			':('        => "\xf0\x9f\x99\x81",
 			':)'        => "\xf0\x9f\x99\x82",
 			':?'        => "\xf0\x9f\x98\x95",
 			':D'        => "\xf0\x9f\x98\x80",
 			':P'        => "\xf0\x9f\x98\x9b",
 			':o'        => "\xf0\x9f\x98\xae",
 			':x'        => "\xf0\x9f\x98\xa1",
 			':|'        => "\xf0\x9f\x98\x90",
 			';)'        => "\xf0\x9f\x98\x89",
 			':!:'       => "\xe2\x9d\x97",
 			':?:'       => "\xe2\x9d\x93",
 		);
 	}
 
 	/**
 	 * Filters all the smilies.
 	 *
 	 * This filter must be added before `smilies_init` is run, as
 	 * it is normally only run once to setup the smilies regex.
 	 *
 	 * @since 4.7.0
 	 *
 	 * @param string[] $wpsmiliestrans List of the smilies' hexadecimal representations, keyed by their smily code.
 	 */
 	$wpsmiliestrans = apply_filters( 'smilies', $wpsmiliestrans );
 
 	if ( count( $wpsmiliestrans ) == 0 ) {
 		return;
 	}
 
 	/*
 	 * NOTE: we sort the smilies in reverse key order. This is to make sure
 	 * we match the longest possible smilie (:???: vs :?) as the regular
 	 * expression used below is first-match
 	 */
 	krsort( $wpsmiliestrans );
 
 	$spaces = wp_spaces_regexp();
 
 	// Begin first "subpattern".
 	$wp_smiliessearch = '/(?<=' . $spaces . '|^)';
 
 	$subchar = '';
 	foreach ( (array) $wpsmiliestrans as $smiley => $img ) {
 		$firstchar = substr( $smiley, 0, 1 );
 		$rest      = substr( $smiley, 1 );
 
 		// New subpattern?
 		if ( $firstchar != $subchar ) {
 			if ( '' !== $subchar ) {
 				$wp_smiliessearch .= ')(?=' . $spaces . '|$)';  // End previous "subpattern".
 				$wp_smiliessearch .= '|(?<=' . $spaces . '|^)'; // Begin another "subpattern".
 			}
 			$subchar           = $firstchar;
 			$wp_smiliessearch .= preg_quote( $firstchar, '/' ) . '(?:';
 		} else {
 			$wp_smiliessearch .= '|';
 		}
 		$wp_smiliessearch .= preg_quote( $rest, '/' );
 	}
 
 	$wp_smiliessearch .= ')(?=' . $spaces . '|$)/m';
 
 }
 
 /**
  * Merges user defined arguments into defaults array.
  *
  * This function is used throughout WordPress to allow for both string or array
  * to be merged into another array.
  *
  * @since 2.2.0
  * @since 2.3.0 `$args` can now also be an object.
  *
  * @param string|array|object $args     Value to merge with $defaults.
  * @param array               $defaults Optional. Array that serves as the defaults.
  *                                      Default empty array.
  * @return array Merged user defined values with defaults.
  */
 function wp_parse_args( $args, $defaults = array() ) {
 	if ( is_object( $args ) ) {
 		$parsed_args = get_object_vars( $args );
 	} elseif ( is_array( $args ) ) {
 		$parsed_args =& $args;
 	} else {
 		wp_parse_str( $args, $parsed_args );
 	}
 
 	if ( is_array( $defaults ) && $defaults ) {
 		return array_merge( $defaults, $parsed_args );
 	}
 	return $parsed_args;
 }
 
 /**
  * Converts a comma- or space-separated list of scalar values to an array.
  *
  * @since 5.1.0
  *
  * @param array|string $list List of values.
  * @return array Array of values.
  */
 function wp_parse_list( $list ) {
 	if ( ! is_array( $list ) ) {
 		return preg_split( '/[\s,]+/', $list, -1, PREG_SPLIT_NO_EMPTY );
 	}
 
 	return $list;
 }
 
 /**
  * Cleans up an array, comma- or space-separated list of IDs.
  *
  * @since 3.0.0
  * @since 5.1.0 Refactored to use wp_parse_list().
  *
  * @param array|string $list List of IDs.
  * @return int[] Sanitized array of IDs.
  */
 function wp_parse_id_list( $list ) {
 	$list = wp_parse_list( $list );
 
 	return array_unique( array_map( 'absint', $list ) );
 }
 
 /**
  * Cleans up an array, comma- or space-separated list of slugs.
  *
  * @since 4.7.0
  * @since 5.1.0 Refactored to use wp_parse_list().
  *
  * @param array|string $list List of slugs.
  * @return string[] Sanitized array of slugs.
  */
 function wp_parse_slug_list( $list ) {
 	$list = wp_parse_list( $list );
 
 	return array_unique( array_map( 'sanitize_title', $list ) );
 }
 
 /**
  * Extract a slice of an array, given a list of keys.
  *
  * @since 3.1.0
  *
  * @param array $array The original array.
  * @param array $keys  The list of keys.
  * @return array The array slice.
  */
 function wp_array_slice_assoc( $array, $keys ) {
 	$slice = array();
 
 	foreach ( $keys as $key ) {
 		if ( isset( $array[ $key ] ) ) {
 			$slice[ $key ] = $array[ $key ];
 		}
 	}
 
 	return $slice;
 }
 
 /**
  * Accesses an array in depth based on a path of keys.
  *
  * It is the PHP equivalent of JavaScript's `lodash.get()` and mirroring it may help other components
  * retain some symmetry between client and server implementations.
  *
  * Example usage:
  *
  *     $array = array(
  *         'a' => array(
  *             'b' => array(
  *                 'c' => 1,
  *             ),
  *         ),
  *     );
  *     _wp_array_get( $array, array( 'a', 'b', 'c' ) );
  *
  * @internal
  *
  * @since 5.6.0
  * @access private
  *
  * @param array $array   An array from which we want to retrieve some information.
  * @param array $path    An array of keys describing the path with which to retrieve information.
  * @param mixed $default The return value if the path does not exist within the array,
  *                       or if `$array` or `$path` are not arrays.
  * @return mixed The value from the path specified.
  */
 function _wp_array_get( $array, $path, $default = null ) {
 	// Confirm $path is valid.
 	if ( ! is_array( $path ) || 0 === count( $path ) ) {
 		return $default;
 	}
 
 	foreach ( $path as $path_element ) {
 		if (
 			! is_array( $array ) ||
 			( ! is_string( $path_element ) && ! is_integer( $path_element ) && ! is_null( $path_element ) ) ||
 			! array_key_exists( $path_element, $array )
 		) {
 			return $default;
 		}
 		$array = $array[ $path_element ];
 	}
 
 	return $array;
 }
 
 /**
  * Sets an array in depth based on a path of keys.
  *
  * It is the PHP equivalent of JavaScript's `lodash.set()` and mirroring it may help other components
  * retain some symmetry between client and server implementations.
  *
  * Example usage:
  *
  *     $array = array();
  *     _wp_array_set( $array, array( 'a', 'b', 'c', 1 ) );
  *
  *     $array becomes:
  *     array(
  *         'a' => array(
  *             'b' => array(
  *                 'c' => 1,
  *             ),
  *         ),
  *     );
  *
  * @internal
  *
  * @since 5.8.0
  * @access private
  *
  * @param array $array An array that we want to mutate to include a specific value in a path.
  * @param array $path  An array of keys describing the path that we want to mutate.
  * @param mixed $value The value that will be set.
  */
 function _wp_array_set( &$array, $path, $value = null ) {
 	// Confirm $array is valid.
 	if ( ! is_array( $array ) ) {
 		return;
 	}
 
 	// Confirm $path is valid.
 	if ( ! is_array( $path ) ) {
 		return;
 	}
 
 	$path_length = count( $path );
 
 	if ( 0 === $path_length ) {
 		return;
 	}
 
 	foreach ( $path as $path_element ) {
 		if (
 			! is_string( $path_element ) && ! is_integer( $path_element ) &&
 			! is_null( $path_element )
 		) {
 			return;
 		}
 	}
 
 	for ( $i = 0; $i < $path_length - 1; ++$i ) {
 		$path_element = $path[ $i ];
 		if (
 			! array_key_exists( $path_element, $array ) ||
 			! is_array( $array[ $path_element ] )
 		) {
 			$array[ $path_element ] = array();
 		}
 		$array = &$array[ $path_element ]; // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.VariableRedeclaration
 	}
 
 	$array[ $path[ $i ] ] = $value;
 }
 
 /**
  * This function is trying to replicate what
  * lodash's kebabCase (JS library) does in the client.
  *
  * The reason we need this function is that we do some processing
  * in both the client and the server (e.g.: we generate
  * preset classes from preset slugs) that needs to
  * create the same output.
  *
  * We can't remove or update the client's library due to backward compatibility
  * (some of the output of lodash's kebabCase is saved in the post content).
  * We have to make the server behave like the client.
  *
  * Changes to this function should follow updates in the client
  * with the same logic.
  *
  * @link https://github.com/lodash/lodash/blob/4.17/dist/lodash.js#L14369
  * @link https://github.com/lodash/lodash/blob/4.17/dist/lodash.js#L278
  * @link https://github.com/lodash-php/lodash-php/blob/master/src/String/kebabCase.php
  * @link https://github.com/lodash-php/lodash-php/blob/master/src/internal/unicodeWords.php
  *
  * @param string $string The string to kebab-case.
  *
  * @return string kebab-cased-string.
  */
 function _wp_to_kebab_case( $string ) {
 	//phpcs:disable WordPress.NamingConventions.ValidVariableName.VariableNotSnakeCase
 	// ignore the camelCase names for variables so the names are the same as lodash
 	// so comparing and porting new changes is easier.
 
 	/*
 	 * Some notable things we've removed compared to the lodash version are:
 	 *
 	 * - non-alphanumeric characters: rsAstralRange, rsEmoji, etc
 	 * - the groups that processed the apostrophe, as it's removed before passing the string to preg_match: rsApos, rsOptContrLower, and rsOptContrUpper
 	 *
 	 */
 
 	/** Used to compose unicode character classes. */
 	$rsLowerRange       = 'a-z\\xdf-\\xf6\\xf8-\\xff';
 	$rsNonCharRange     = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf';
 	$rsPunctuationRange = '\\x{2000}-\\x{206f}';
 	$rsSpaceRange       = ' \\t\\x0b\\f\\xa0\\x{feff}\\n\\r\\x{2028}\\x{2029}\\x{1680}\\x{180e}\\x{2000}\\x{2001}\\x{2002}\\x{2003}\\x{2004}\\x{2005}\\x{2006}\\x{2007}\\x{2008}\\x{2009}\\x{200a}\\x{202f}\\x{205f}\\x{3000}';
 	$rsUpperRange       = 'A-Z\\xc0-\\xd6\\xd8-\\xde';
 	$rsBreakRange       = $rsNonCharRange . $rsPunctuationRange . $rsSpaceRange;
 
 	/** Used to compose unicode capture groups. */
 	$rsBreak  = '[' . $rsBreakRange . ']';
 	$rsDigits = '\\d+'; // The last lodash version in GitHub uses a single digit here and expands it when in use.
 	$rsLower  = '[' . $rsLowerRange . ']';
 	$rsMisc   = '[^' . $rsBreakRange . $rsDigits . $rsLowerRange . $rsUpperRange . ']';
 	$rsUpper  = '[' . $rsUpperRange . ']';
 
 	/** Used to compose unicode regexes. */
 	$rsMiscLower = '(?:' . $rsLower . '|' . $rsMisc . ')';
 	$rsMiscUpper = '(?:' . $rsUpper . '|' . $rsMisc . ')';
 	$rsOrdLower  = '\\d*(?:1st|2nd|3rd|(?![123])\\dth)(?=\\b|[A-Z_])';
 	$rsOrdUpper  = '\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])';
 
 	$regexp = '/' . implode(
 		'|',
 		array(
 			$rsUpper . '?' . $rsLower . '+' . '(?=' . implode( '|', array( $rsBreak, $rsUpper, '$' ) ) . ')',
 			$rsMiscUpper . '+' . '(?=' . implode( '|', array( $rsBreak, $rsUpper . $rsMiscLower, '$' ) ) . ')',
 			$rsUpper . '?' . $rsMiscLower . '+',
 			$rsUpper . '+',
 			$rsOrdUpper,
 			$rsOrdLower,
 			$rsDigits,
 		)
 	) . '/u';
 
 	preg_match_all( $regexp, str_replace( "'", '', $string ), $matches );
 	return strtolower( implode( '-', $matches[0] ) );
 	//phpcs:enable WordPress.NamingConventions.ValidVariableName.VariableNotSnakeCase
 }
 
 /**
  * Determines if the variable is a numeric-indexed array.
  *
  * @since 4.4.0
  *
  * @param mixed $data Variable to check.
  * @return bool Whether the variable is a list.
  */
 function wp_is_numeric_array( $data ) {
 	if ( ! is_array( $data ) ) {
 		return false;
 	}
 
 	$keys        = array_keys( $data );
 	$string_keys = array_filter( $keys, 'is_string' );
 
 	return count( $string_keys ) === 0;
 }
 
 /**
  * Filters a list of objects, based on a set of key => value arguments.
  *
  * Retrieves the objects from the list that match the given arguments.
  * Key represents property name, and value represents property value.
  *
  * If an object has more properties than those specified in arguments,
  * that will not disqualify it. When using the 'AND' operator,
  * any missing properties will disqualify it.
  *
  * When using the `$field` argument, this function can also retrieve
  * a particular field from all matching objects, whereas wp_list_filter()
  * only does the filtering.
  *
  * @since 3.0.0
  * @since 4.7.0 Uses `WP_List_Util` class.
  *
  * @param array       $list     An array of objects to filter.
  * @param array       $args     Optional. An array of key => value arguments to match
  *                              against each object. Default empty array.
  * @param string      $operator Optional. The logical operation to perform. 'AND' means
  *                              all elements from the array must match. 'OR' means only
  *                              one element needs to match. 'NOT' means no elements may
  *                              match. Default 'AND'.
  * @param bool|string $field    Optional. A field from the object to place instead
  *                              of the entire object. Default false.
  * @return array A list of objects or object fields.
  */
 function wp_filter_object_list( $list, $args = array(), $operator = 'and', $field = false ) {
 	if ( ! is_array( $list ) ) {
 		return array();
 	}
 
 	$util = new WP_List_Util( $list );
 
 	$util->filter( $args, $operator );
 
 	if ( $field ) {
 		$util->pluck( $field );
 	}
 
 	return $util->get_output();
 }
 
 /**
  * Filters a list of objects, based on a set of key => value arguments.
  *
  * Retrieves the objects from the list that match the given arguments.
  * Key represents property name, and value represents property value.
  *
  * If an object has more properties than those specified in arguments,
  * that will not disqualify it. When using the 'AND' operator,
  * any missing properties will disqualify it.
  *
  * If you want to retrieve a particular field from all matching objects,
  * use wp_filter_object_list() instead.
  *
  * @since 3.1.0
  * @since 4.7.0 Uses `WP_List_Util` class.
  *
  * @param array  $list     An array of objects to filter.
  * @param array  $args     Optional. An array of key => value arguments to match
  *                         against each object. Default empty array.
  * @param string $operator Optional. The logical operation to perform. 'AND' means
  *                         all elements from the array must match. 'OR' means only
  *                         one element needs to match. 'NOT' means no elements may
  *                         match. Default 'AND'.
  * @return array Array of found values.
  */
 function wp_list_filter( $list, $args = array(), $operator = 'AND' ) {
 	if ( ! is_array( $list ) ) {
 		return array();
 	}
 
 	$util = new WP_List_Util( $list );
 
 	return $util->filter( $args, $operator );
 }
 
 /**
  * Pluck a certain field out of each object in a list.
  *
  * This has the same functionality and prototype of
  * array_column() (PHP 5.5) but also supports objects.
  *
  * @since 3.1.0
  * @since 4.0.0 $index_key parameter added.
  * @since 4.7.0 Uses `WP_List_Util` class.
  *
  * @param array      $list      List of objects or arrays.
  * @param int|string $field     Field from the object to place instead of the entire object.
  * @param int|string $index_key Optional. Field from the object to use as keys for the new array.
  *                              Default null.
  * @return array Array of found values. If `$index_key` is set, an array of found values with keys
  *               corresponding to `$index_key`. If `$index_key` is null, array keys from the original
  *               `$list` will be preserved in the results.
  */
 function wp_list_pluck( $list, $field, $index_key = null ) {
 	$util = new WP_List_Util( $list );
 
 	return $util->pluck( $field, $index_key );
 }
 
 /**
  * Sorts a list of objects, based on one or more orderby arguments.
  *
  * @since 4.7.0
  *
  * @param array        $list          An array of objects to sort.
  * @param string|array $orderby       Optional. Either the field name to order by or an array
  *                                    of multiple orderby fields as $orderby => $order.
  * @param string       $order         Optional. Either 'ASC' or 'DESC'. Only used if $orderby
  *                                    is a string.
  * @param bool         $preserve_keys Optional. Whether to preserve keys. Default false.
  * @return array The sorted array.
  */
 function wp_list_sort( $list, $orderby = array(), $order = 'ASC', $preserve_keys = false ) {
 	if ( ! is_array( $list ) ) {
 		return array();
 	}
 
 	$util = new WP_List_Util( $list );
 
 	return $util->sort( $orderby, $order, $preserve_keys );
 }
 
 /**
  * Determines if Widgets library should be loaded.
  *
  * Checks to make sure that the widgets library hasn't already been loaded.
  * If it hasn't, then it will load the widgets library and run an action hook.
  *
  * @since 2.2.0
  */
 function wp_maybe_load_widgets() {
 	/**
 	 * Filters whether to load the Widgets library.
 	 *
 	 * Returning a falsey value from the filter will effectively short-circuit
 	 * the Widgets library from loading.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param bool $wp_maybe_load_widgets Whether to load the Widgets library.
 	 *                                    Default true.
 	 */
 	if ( ! apply_filters( 'load_default_widgets', true ) ) {
 		return;
 	}
 
 	require_once ABSPATH . WPINC . '/default-widgets.php';
 
 	add_action( '_admin_menu', 'wp_widgets_add_menu' );
 }
 
 /**
  * Append the Widgets menu to the themes main menu.
  *
  * @since 2.2.0
  *
  * @global array $submenu
  */
 function wp_widgets_add_menu() {
 	global $submenu;
 
 	if ( ! current_theme_supports( 'widgets' ) ) {
 		return;
 	}
 
 	$submenu['themes.php'][7] = array( __( 'Widgets' ), 'edit_theme_options', 'widgets.php' );
 	ksort( $submenu['themes.php'], SORT_NUMERIC );
 }
 
 /**
  * Flush all output buffers for PHP 5.2.
  *
  * Make sure all output buffers are flushed before our singletons are destroyed.
  *
  * @since 2.2.0
  */
 function wp_ob_end_flush_all() {
 	$levels = ob_get_level();
 	for ( $i = 0; $i < $levels; $i++ ) {
 		ob_end_flush();
 	}
 }
 
 /**
  * Load custom DB error or display WordPress DB error.
  *
  * If a file exists in the wp-content directory named db-error.php, then it will
  * be loaded instead of displaying the WordPress DB error. If it is not found,
  * then the WordPress DB error will be displayed instead.
  *
  * The WordPress DB error sets the HTTP status header to 500 to try to prevent
  * search engines from caching the message. Custom DB messages should do the
  * same.
  *
  * This function was backported to WordPress 2.3.2, but originally was added
  * in WordPress 2.5.0.
  *
  * @since 2.3.2
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  */
 function dead_db() {
 	global $wpdb;
 
 	wp_load_translations_early();
 
 	// Load custom DB error template, if present.
 	if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) {
 		require_once WP_CONTENT_DIR . '/db-error.php';
 		die();
 	}
 
 	// If installing or in the admin, provide the verbose message.
 	if ( wp_installing() || defined( 'WP_ADMIN' ) ) {
 		wp_die( $wpdb->error );
 	}
 
 	// Otherwise, be terse.
 	wp_die( '<h1>' . __( 'Error establishing a database connection' ) . '</h1>', __( 'Database Error' ) );
 }
 
 /**
  * Convert a value to non-negative integer.
  *
  * @since 2.5.0
  *
  * @param mixed $maybeint Data you wish to have converted to a non-negative integer.
  * @return int A non-negative integer.
  */
 function absint( $maybeint ) {
 	return abs( (int) $maybeint );
 }
 
 /**
  * Mark a function as deprecated and inform when it has been used.
  *
  * There is a {@see 'hook deprecated_function_run'} that will be called that can be used
  * to get the backtrace up to what file and function called the deprecated
  * function.
  *
  * The current behavior is to trigger a user error if `WP_DEBUG` is true.
  *
  * This function is to be used in every function that is deprecated.
  *
  * @since 2.5.0
  * @since 5.4.0 This function is no longer marked as "private".
  * @since 5.4.0 The error type is now classified as E_USER_DEPRECATED (used to default to E_USER_NOTICE).
  *
  * @param string $function    The function that was called.
  * @param string $version     The version of WordPress that deprecated the function.
  * @param string $replacement Optional. The function that should have been called. Default empty.
  */
 function _deprecated_function( $function, $version, $replacement = '' ) {
 
 	/**
 	 * Fires when a deprecated function is called.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param string $function    The function that was called.
 	 * @param string $replacement The function that should have been called.
 	 * @param string $version     The version of WordPress that deprecated the function.
 	 */
 	do_action( 'deprecated_function_run', $function, $replacement, $version );
 
 	/**
 	 * Filters whether to trigger an error for deprecated functions.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
 	 */
 	if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) {
 		if ( function_exists( '__' ) ) {
 			if ( $replacement ) {
 				trigger_error(
 					sprintf(
 						/* translators: 1: PHP function name, 2: Version number, 3: Alternative function name. */
 						__( '%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ),
 						$function,
 						$version,
 						$replacement
 					),
 					E_USER_DEPRECATED
 				);
 			} else {
 				trigger_error(
 					sprintf(
 						/* translators: 1: PHP function name, 2: Version number. */
 						__( '%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.' ),
 						$function,
 						$version
 					),
 					E_USER_DEPRECATED
 				);
 			}
 		} else {
 			if ( $replacement ) {
 				trigger_error(
 					sprintf(
 						'%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.',
 						$function,
 						$version,
 						$replacement
 					),
 					E_USER_DEPRECATED
 				);
 			} else {
 				trigger_error(
 					sprintf(
 						'%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.',
 						$function,
 						$version
 					),
 					E_USER_DEPRECATED
 				);
 			}
 		}
 	}
 }
 
 /**
  * Marks a constructor as deprecated and informs when it has been used.
  *
  * Similar to _deprecated_function(), but with different strings. Used to
  * remove PHP4 style constructors.
  *
  * The current behavior is to trigger a user error if `WP_DEBUG` is true.
  *
  * This function is to be used in every PHP4 style constructor method that is deprecated.
  *
  * @since 4.3.0
  * @since 4.5.0 Added the `$parent_class` parameter.
  * @since 5.4.0 This function is no longer marked as "private".
  * @since 5.4.0 The error type is now classified as E_USER_DEPRECATED (used to default to E_USER_NOTICE).
  *
  * @param string $class        The class containing the deprecated constructor.
  * @param string $version      The version of WordPress that deprecated the function.
  * @param string $parent_class Optional. The parent class calling the deprecated constructor.
  *                             Default empty string.
  */
 function _deprecated_constructor( $class, $version, $parent_class = '' ) {
 
 	/**
 	 * Fires when a deprecated constructor is called.
 	 *
 	 * @since 4.3.0
 	 * @since 4.5.0 Added the `$parent_class` parameter.
 	 *
 	 * @param string $class        The class containing the deprecated constructor.
 	 * @param string $version      The version of WordPress that deprecated the function.
 	 * @param string $parent_class The parent class calling the deprecated constructor.
 	 */
 	do_action( 'deprecated_constructor_run', $class, $version, $parent_class );
 
 	/**
 	 * Filters whether to trigger an error for deprecated functions.
 	 *
 	 * `WP_DEBUG` must be true in addition to the filter evaluating to true.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
 	 */
 	if ( WP_DEBUG && apply_filters( 'deprecated_constructor_trigger_error', true ) ) {
 		if ( function_exists( '__' ) ) {
 			if ( $parent_class ) {
 				trigger_error(
 					sprintf(
 						/* translators: 1: PHP class name, 2: PHP parent class name, 3: Version number, 4: __construct() method. */
 						__( 'The called constructor method for %1$s in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.' ),
 						$class,
 						$parent_class,
 						$version,
 						'<code>__construct()</code>'
 					),
 					E_USER_DEPRECATED
 				);
 			} else {
 				trigger_error(
 					sprintf(
 						/* translators: 1: PHP class name, 2: Version number, 3: __construct() method. */
 						__( 'The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ),
 						$class,
 						$version,
 						'<code>__construct()</code>'
 					),
 					E_USER_DEPRECATED
 				);
 			}
 		} else {
 			if ( $parent_class ) {
 				trigger_error(
 					sprintf(
 						'The called constructor method for %1$s in %2$s is <strong>deprecated</strong> since version %3$s! Use %4$s instead.',
 						$class,
 						$parent_class,
 						$version,
 						'<code>__construct()</code>'
 					),
 					E_USER_DEPRECATED
 				);
 			} else {
 				trigger_error(
 					sprintf(
 						'The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.',
 						$class,
 						$version,
 						'<code>__construct()</code>'
 					),
 					E_USER_DEPRECATED
 				);
 			}
 		}
 	}
 
 }
 
 /**
  * Mark a file as deprecated and inform when it has been used.
  *
  * There is a hook {@see 'deprecated_file_included'} that will be called that can be used
  * to get the backtrace up to what file and function included the deprecated
  * file.
  *
  * The current behavior is to trigger a user error if `WP_DEBUG` is true.
  *
  * This function is to be used in every file that is deprecated.
  *
  * @since 2.5.0
  * @since 5.4.0 This function is no longer marked as "private".
  * @since 5.4.0 The error type is now classified as E_USER_DEPRECATED (used to default to E_USER_NOTICE).
  *
  * @param string $file        The file that was included.
  * @param string $version     The version of WordPress that deprecated the file.
  * @param string $replacement Optional. The file that should have been included based on ABSPATH.
  *                            Default empty.
  * @param string $message     Optional. A message regarding the change. Default empty.
  */
 function _deprecated_file( $file, $version, $replacement = '', $message = '' ) {
 
 	/**
 	 * Fires when a deprecated file is called.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param string $file        The file that was called.
 	 * @param string $replacement The file that should have been included based on ABSPATH.
 	 * @param string $version     The version of WordPress that deprecated the file.
 	 * @param string $message     A message regarding the change.
 	 */
 	do_action( 'deprecated_file_included', $file, $replacement, $version, $message );
 
 	/**
 	 * Filters whether to trigger an error for deprecated files.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param bool $trigger Whether to trigger the error for deprecated files. Default true.
 	 */
 	if ( WP_DEBUG && apply_filters( 'deprecated_file_trigger_error', true ) ) {
 		$message = empty( $message ) ? '' : ' ' . $message;
 
 		if ( function_exists( '__' ) ) {
 			if ( $replacement ) {
 				trigger_error(
 					sprintf(
 						/* translators: 1: PHP file name, 2: Version number, 3: Alternative file name. */
 						__( '%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ),
 						$file,
 						$version,
 						$replacement
 					) . $message,
 					E_USER_DEPRECATED
 				);
 			} else {
 				trigger_error(
 					sprintf(
 						/* translators: 1: PHP file name, 2: Version number. */
 						__( '%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.' ),
 						$file,
 						$version
 					) . $message,
 					E_USER_DEPRECATED
 				);
 			}
 		} else {
 			if ( $replacement ) {
 				trigger_error(
 					sprintf(
 						'%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.',
 						$file,
 						$version,
 						$replacement
 					) . $message,
 					E_USER_DEPRECATED
 				);
 			} else {
 				trigger_error(
 					sprintf(
 						'%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.',
 						$file,
 						$version
 					) . $message,
 					E_USER_DEPRECATED
 				);
 			}
 		}
 	}
 }
 /**
  * Mark a function argument as deprecated and inform when it has been used.
  *
  * This function is to be used whenever a deprecated function argument is used.
  * Before this function is called, the argument must be checked for whether it was
  * used by comparing it to its default value or evaluating whether it is empty.
  * For example:
  *
  *     if ( ! empty( $deprecated ) ) {
  *         _deprecated_argument( __FUNCTION__, '3.0.0' );
  *     }
  *
  * There is a hook deprecated_argument_run that will be called that can be used
  * to get the backtrace up to what file and function used the deprecated
  * argument.
  *
  * The current behavior is to trigger a user error if WP_DEBUG is true.
  *
  * @since 3.0.0
  * @since 5.4.0 This function is no longer marked as "private".
  * @since 5.4.0 The error type is now classified as E_USER_DEPRECATED (used to default to E_USER_NOTICE).
  *
  * @param string $function The function that was called.
  * @param string $version  The version of WordPress that deprecated the argument used.
  * @param string $message  Optional. A message regarding the change. Default empty.
  */
 function _deprecated_argument( $function, $version, $message = '' ) {
 
 	/**
 	 * Fires when a deprecated argument is called.
 	 *
 	 * @since 3.0.0
 	 *
 	 * @param string $function The function that was called.
 	 * @param string $message  A message regarding the change.
 	 * @param string $version  The version of WordPress that deprecated the argument used.
 	 */
 	do_action( 'deprecated_argument_run', $function, $message, $version );
 
 	/**
 	 * Filters whether to trigger an error for deprecated arguments.
 	 *
 	 * @since 3.0.0
 	 *
 	 * @param bool $trigger Whether to trigger the error for deprecated arguments. Default true.
 	 */
 	if ( WP_DEBUG && apply_filters( 'deprecated_argument_trigger_error', true ) ) {
 		if ( function_exists( '__' ) ) {
 			if ( $message ) {
 				trigger_error(
 					sprintf(
 						/* translators: 1: PHP function name, 2: Version number, 3: Optional message regarding the change. */
 						__( '%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s' ),
 						$function,
 						$version,
 						$message
 					),
 					E_USER_DEPRECATED
 				);
 			} else {
 				trigger_error(
 					sprintf(
 						/* translators: 1: PHP function name, 2: Version number. */
 						__( '%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s with no alternative available.' ),
 						$function,
 						$version
 					),
 					E_USER_DEPRECATED
 				);
 			}
 		} else {
 			if ( $message ) {
 				trigger_error(
 					sprintf(
 						'%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s! %3$s',
 						$function,
 						$version,
 						$message
 					),
 					E_USER_DEPRECATED
 				);
 			} else {
 				trigger_error(
 					sprintf(
 						'%1$s was called with an argument that is <strong>deprecated</strong> since version %2$s with no alternative available.',
 						$function,
 						$version
 					),
 					E_USER_DEPRECATED
 				);
 			}
 		}
 	}
 }
 
 /**
  * Marks a deprecated action or filter hook as deprecated and throws a notice.
  *
  * Use the {@see 'deprecated_hook_run'} action to get the backtrace describing where
  * the deprecated hook was called.
  *
  * Default behavior is to trigger a user error if `WP_DEBUG` is true.
  *
  * This function is called by the do_action_deprecated() and apply_filters_deprecated()
  * functions, and so generally does not need to be called directly.
  *
  * @since 4.6.0
  * @since 5.4.0 The error type is now classified as E_USER_DEPRECATED (used to default to E_USER_NOTICE).
  * @access private
  *
  * @param string $hook        The hook that was used.
  * @param string $version     The version of WordPress that deprecated the hook.
  * @param string $replacement Optional. The hook that should have been used. Default empty.
  * @param string $message     Optional. A message regarding the change. Default empty.
  */
 function _deprecated_hook( $hook, $version, $replacement = '', $message = '' ) {
 	/**
 	 * Fires when a deprecated hook is called.
 	 *
 	 * @since 4.6.0
 	 *
 	 * @param string $hook        The hook that was called.
 	 * @param string $replacement The hook that should be used as a replacement.
 	 * @param string $version     The version of WordPress that deprecated the argument used.
 	 * @param string $message     A message regarding the change.
 	 */
 	do_action( 'deprecated_hook_run', $hook, $replacement, $version, $message );
 
 	/**
 	 * Filters whether to trigger deprecated hook errors.
 	 *
 	 * @since 4.6.0
 	 *
 	 * @param bool $trigger Whether to trigger deprecated hook errors. Requires
 	 *                      `WP_DEBUG` to be defined true.
 	 */
 	if ( WP_DEBUG && apply_filters( 'deprecated_hook_trigger_error', true ) ) {
 		$message = empty( $message ) ? '' : ' ' . $message;
 
 		if ( $replacement ) {
 			trigger_error(
 				sprintf(
 					/* translators: 1: WordPress hook name, 2: Version number, 3: Alternative hook name. */
 					__( '%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ),
 					$hook,
 					$version,
 					$replacement
 				) . $message,
 				E_USER_DEPRECATED
 			);
 		} else {
 			trigger_error(
 				sprintf(
 					/* translators: 1: WordPress hook name, 2: Version number. */
 					__( '%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.' ),
 					$hook,
 					$version
 				) . $message,
 				E_USER_DEPRECATED
 			);
 		}
 	}
 }
 
 /**
  * Mark something as being incorrectly called.
  *
  * There is a hook {@see 'doing_it_wrong_run'} that will be called that can be used
  * to get the backtrace up to what file and function called the deprecated
  * function.
  *
  * The current behavior is to trigger a user error if `WP_DEBUG` is true.
  *
  * @since 3.1.0
  * @since 5.4.0 This function is no longer marked as "private".
  *
  * @param string $function The function that was called.
  * @param string $message  A message explaining what has been done incorrectly.
  * @param string $version  The version of WordPress where the message was added.
  */
 function _doing_it_wrong( $function, $message, $version ) {
 
 	/**
 	 * Fires when the given function is being used incorrectly.
 	 *
 	 * @since 3.1.0
 	 *
 	 * @param string $function The function that was called.
 	 * @param string $message  A message explaining what has been done incorrectly.
 	 * @param string $version  The version of WordPress where the message was added.
 	 */
 	do_action( 'doing_it_wrong_run', $function, $message, $version );
 
 	/**
 	 * Filters whether to trigger an error for _doing_it_wrong() calls.
 	 *
 	 * @since 3.1.0
 	 * @since 5.1.0 Added the $function, $message and $version parameters.
 	 *
 	 * @param bool   $trigger  Whether to trigger the error for _doing_it_wrong() calls. Default true.
 	 * @param string $function The function that was called.
 	 * @param string $message  A message explaining what has been done incorrectly.
 	 * @param string $version  The version of WordPress where the message was added.
 	 */
 	if ( WP_DEBUG && apply_filters( 'doing_it_wrong_trigger_error', true, $function, $message, $version ) ) {
 		if ( function_exists( '__' ) ) {
 			if ( $version ) {
 				/* translators: %s: Version number. */
 				$version = sprintf( __( '(This message was added in version %s.)' ), $version );
 			}
 
 			$message .= ' ' . sprintf(
 				/* translators: %s: Documentation URL. */
 				__( 'Please see <a href="%s">Debugging in WordPress</a> for more information.' ),
 				__( 'https://wordpress.org/support/article/debugging-in-wordpress/' )
 			);
 
 			trigger_error(
 				sprintf(
 					/* translators: Developer debugging message. 1: PHP function name, 2: Explanatory message, 3: WordPress version number. */
 					__( '%1$s was called <strong>incorrectly</strong>. %2$s %3$s' ),
 					$function,
 					$message,
 					$version
 				),
 				E_USER_NOTICE
 			);
 		} else {
 			if ( $version ) {
 				$version = sprintf( '(This message was added in version %s.)', $version );
 			}
 
 			$message .= sprintf(
 				' Please see <a href="%s">Debugging in WordPress</a> for more information.',
 				'https://wordpress.org/support/article/debugging-in-wordpress/'
 			);
 
 			trigger_error(
 				sprintf(
 					'%1$s was called <strong>incorrectly</strong>. %2$s %3$s',
 					$function,
 					$message,
 					$version
 				),
 				E_USER_NOTICE
 			);
 		}
 	}
 }
 
 /**
  * Is the server running earlier than 1.5.0 version of lighttpd?
  *
  * @since 2.5.0
  *
  * @return bool Whether the server is running lighttpd < 1.5.0.
  */
 function is_lighttpd_before_150() {
 	$server_parts    = explode( '/', isset( $_SERVER['SERVER_SOFTWARE'] ) ? $_SERVER['SERVER_SOFTWARE'] : '' );
 	$server_parts[1] = isset( $server_parts[1] ) ? $server_parts[1] : '';
 
 	return ( 'lighttpd' === $server_parts[0] && -1 == version_compare( $server_parts[1], '1.5.0' ) );
 }
 
 /**
  * Does the specified module exist in the Apache config?
  *
  * @since 2.5.0
  *
  * @global bool $is_apache
  *
  * @param string $mod     The module, e.g. mod_rewrite.
  * @param bool   $default Optional. The default return value if the module is not found. Default false.
  * @return bool Whether the specified module is loaded.
  */
 function apache_mod_loaded( $mod, $default = false ) {
 	global $is_apache;
 
 	if ( ! $is_apache ) {
 		return false;
 	}
 
 	if ( function_exists( 'apache_get_modules' ) ) {
 		$mods = apache_get_modules();
 		if ( in_array( $mod, $mods, true ) ) {
 			return true;
 		}
 	} elseif ( function_exists( 'phpinfo' ) && false === strpos( ini_get( 'disable_functions' ), 'phpinfo' ) ) {
 			ob_start();
 			phpinfo( 8 );
 			$phpinfo = ob_get_clean();
 		if ( false !== strpos( $phpinfo, $mod ) ) {
 			return true;
 		}
 	}
 
 	return $default;
 }
 
 /**
  * Check if IIS 7+ supports pretty permalinks.
  *
  * @since 2.8.0
  *
  * @global bool $is_iis7
  *
  * @return bool Whether IIS7 supports permalinks.
  */
 function iis7_supports_permalinks() {
 	global $is_iis7;
 
 	$supports_permalinks = false;
 	if ( $is_iis7 ) {
 		/* First we check if the DOMDocument class exists. If it does not exist, then we cannot
 		 * easily update the xml configuration file, hence we just bail out and tell user that
 		 * pretty permalinks cannot be used.
 		 *
 		 * Next we check if the URL Rewrite Module 1.1 is loaded and enabled for the web site. When
 		 * URL Rewrite 1.1 is loaded it always sets a server variable called 'IIS_UrlRewriteModule'.
 		 * Lastly we make sure that PHP is running via FastCGI. This is important because if it runs
 		 * via ISAPI then pretty permalinks will not work.
 		 */
 		$supports_permalinks = class_exists( 'DOMDocument', false ) && isset( $_SERVER['IIS_UrlRewriteModule'] ) && ( 'cgi-fcgi' === PHP_SAPI );
 	}
 
 	/**
 	 * Filters whether IIS 7+ supports pretty permalinks.
 	 *
 	 * @since 2.8.0
 	 *
 	 * @param bool $supports_permalinks Whether IIS7 supports permalinks. Default false.
 	 */
 	return apply_filters( 'iis7_supports_permalinks', $supports_permalinks );
 }
 
 /**
  * Validates a file name and path against an allowed set of rules.
  *
  * A return value of `1` means the file path contains directory traversal.
  *
  * A return value of `2` means the file path contains a Windows drive path.
  *
  * A return value of `3` means the file is not in the allowed files list.
  *
  * @since 1.2.0
  *
  * @param string   $file          File path.
  * @param string[] $allowed_files Optional. Array of allowed files.
  * @return int 0 means nothing is wrong, greater than 0 means something was wrong.
  */
 function validate_file( $file, $allowed_files = array() ) {
 	// `../` on its own is not allowed:
 	if ( '../' === $file ) {
 		return 1;
 	}
 
 	// More than one occurence of `../` is not allowed:
 	if ( preg_match_all( '#\.\./#', $file, $matches, PREG_SET_ORDER ) && ( count( $matches ) > 1 ) ) {
 		return 1;
 	}
 
 	// `../` which does not occur at the end of the path is not allowed:
 	if ( false !== strpos( $file, '../' ) && '../' !== mb_substr( $file, -3, 3 ) ) {
 		return 1;
 	}
 
 	// Files not in the allowed file list are not allowed:
 	if ( ! empty( $allowed_files ) && ! in_array( $file, $allowed_files, true ) ) {
 		return 3;
 	}
 
 	// Absolute Windows drive paths are not allowed:
 	if ( ':' === substr( $file, 1, 1 ) ) {
 		return 2;
 	}
 
 	return 0;
 }
 
 /**
  * Whether to force SSL used for the Administration Screens.
  *
  * @since 2.6.0
  *
  * @param string|bool $force Optional. Whether to force SSL in admin screens. Default null.
  * @return bool True if forced, false if not forced.
  */
 function force_ssl_admin( $force = null ) {
 	static $forced = false;
 
 	if ( ! is_null( $force ) ) {
 		$old_forced = $forced;
 		$forced     = $force;
 		return $old_forced;
 	}
 
 	return $forced;
 }
 
 /**
  * Guess the URL for the site.
  *
  * Will remove wp-admin links to retrieve only return URLs not in the wp-admin
  * directory.
  *
  * @since 2.6.0
  *
  * @return string The guessed URL.
  */
 function wp_guess_url() {
 	if ( defined( 'WP_SITEURL' ) && '' !== WP_SITEURL ) {
 		$url = WP_SITEURL;
 	} else {
 		$abspath_fix         = str_replace( '\\', '/', ABSPATH );
 		$script_filename_dir = dirname( $_SERVER['SCRIPT_FILENAME'] );
 
 		// The request is for the admin.
 		if ( strpos( $_SERVER['REQUEST_URI'], 'wp-admin' ) !== false || strpos( $_SERVER['REQUEST_URI'], 'wp-login.php' ) !== false ) {
 			$path = preg_replace( '#/(wp-admin/.*|wp-login.php)#i', '', $_SERVER['REQUEST_URI'] );
 
 			// The request is for a file in ABSPATH.
 		} elseif ( $script_filename_dir . '/' === $abspath_fix ) {
 			// Strip off any file/query params in the path.
 			$path = preg_replace( '#/[^/]*$#i', '', $_SERVER['PHP_SELF'] );
 
 		} else {
 			if ( false !== strpos( $_SERVER['SCRIPT_FILENAME'], $abspath_fix ) ) {
 				// Request is hitting a file inside ABSPATH.
 				$directory = str_replace( ABSPATH, '', $script_filename_dir );
 				// Strip off the subdirectory, and any file/query params.
 				$path = preg_replace( '#/' . preg_quote( $directory, '#' ) . '/[^/]*$#i', '', $_SERVER['REQUEST_URI'] );
 			} elseif ( false !== strpos( $abspath_fix, $script_filename_dir ) ) {
 				// Request is hitting a file above ABSPATH.
 				$subdirectory = substr( $abspath_fix, strpos( $abspath_fix, $script_filename_dir ) + strlen( $script_filename_dir ) );
 				// Strip off any file/query params from the path, appending the subdirectory to the installation.
 				$path = preg_replace( '#/[^/]*$#i', '', $_SERVER['REQUEST_URI'] ) . $subdirectory;
 			} else {
 				$path = $_SERVER['REQUEST_URI'];
 			}
 		}
 
 		$schema = is_ssl() ? 'https://' : 'http://'; // set_url_scheme() is not defined yet.
 		$url    = $schema . $_SERVER['HTTP_HOST'] . $path;
 	}
 
 	return rtrim( $url, '/' );
 }
 
 /**
  * Temporarily suspend cache additions.
  *
  * Stops more data being added to the cache, but still allows cache retrieval.
  * This is useful for actions, such as imports, when a lot of data would otherwise
  * be almost uselessly added to the cache.
  *
  * Suspension lasts for a single page load at most. Remember to call this
  * function again if you wish to re-enable cache adds earlier.
  *
  * @since 3.3.0
  *
  * @param bool $suspend Optional. Suspends additions if true, re-enables them if false.
  * @return bool The current suspend setting
  */
 function wp_suspend_cache_addition( $suspend = null ) {
 	static $_suspend = false;
 
 	if ( is_bool( $suspend ) ) {
 		$_suspend = $suspend;
 	}
 
 	return $_suspend;
 }
 
 /**
  * Suspend cache invalidation.
  *
  * Turns cache invalidation on and off. Useful during imports where you don't want to do
  * invalidations every time a post is inserted. Callers must be sure that what they are
  * doing won't lead to an inconsistent cache when invalidation is suspended.
  *
  * @since 2.7.0
  *
  * @global bool $_wp_suspend_cache_invalidation
  *
  * @param bool $suspend Optional. Whether to suspend or enable cache invalidation. Default true.
  * @return bool The current suspend setting.
  */
 function wp_suspend_cache_invalidation( $suspend = true ) {
 	global $_wp_suspend_cache_invalidation;
 
 	$current_suspend                = $_wp_suspend_cache_invalidation;
 	$_wp_suspend_cache_invalidation = $suspend;
 	return $current_suspend;
 }
 
 /**
  * Determine whether a site is the main site of the current network.
  *
  * @since 3.0.0
  * @since 4.9.0 The `$network_id` parameter was added.
  *
  * @param int $site_id    Optional. Site ID to test. Defaults to current site.
  * @param int $network_id Optional. Network ID of the network to check for.
  *                        Defaults to current network.
  * @return bool True if $site_id is the main site of the network, or if not
  *              running Multisite.
  */
 function is_main_site( $site_id = null, $network_id = null ) {
 	if ( ! is_multisite() ) {
 		return true;
 	}
 
 	if ( ! $site_id ) {
 		$site_id = get_current_blog_id();
 	}
 
 	$site_id = (int) $site_id;
 
 	return get_main_site_id( $network_id ) === $site_id;
 }
 
 /**
  * Gets the main site ID.
  *
  * @since 4.9.0
  *
  * @param int $network_id Optional. The ID of the network for which to get the main site.
  *                        Defaults to the current network.
  * @return int The ID of the main site.
  */
 function get_main_site_id( $network_id = null ) {
 	if ( ! is_multisite() ) {
 		return get_current_blog_id();
 	}
 
 	$network = get_network( $network_id );
 	if ( ! $network ) {
 		return 0;
 	}
 
 	return $network->site_id;
 }
 
 /**
  * Determine whether a network is the main network of the Multisite installation.
  *
  * @since 3.7.0
  *
  * @param int $network_id Optional. Network ID to test. Defaults to current network.
  * @return bool True if $network_id is the main network, or if not running Multisite.
  */
 function is_main_network( $network_id = null ) {
 	if ( ! is_multisite() ) {
 		return true;
 	}
 
 	if ( null === $network_id ) {
 		$network_id = get_current_network_id();
 	}
 
 	$network_id = (int) $network_id;
 
 	return ( get_main_network_id() === $network_id );
 }
 
 /**
  * Get the main network ID.
  *
  * @since 4.3.0
  *
  * @return int The ID of the main network.
  */
 function get_main_network_id() {
 	if ( ! is_multisite() ) {
 		return 1;
 	}
 
 	$current_network = get_network();
 
 	if ( defined( 'PRIMARY_NETWORK_ID' ) ) {
 		$main_network_id = PRIMARY_NETWORK_ID;
 	} elseif ( isset( $current_network->id ) && 1 === (int) $current_network->id ) {
 		// If the current network has an ID of 1, assume it is the main network.
 		$main_network_id = 1;
 	} else {
 		$_networks       = get_networks(
 			array(
 				'fields' => 'ids',
 				'number' => 1,
 			)
 		);
 		$main_network_id = array_shift( $_networks );
 	}
 
 	/**
 	 * Filters the main network ID.
 	 *
 	 * @since 4.3.0
 	 *
 	 * @param int $main_network_id The ID of the main network.
 	 */
 	return (int) apply_filters( 'get_main_network_id', $main_network_id );
 }
 
 /**
  * Determine whether global terms are enabled.
  *
  * @since 3.0.0
  *
  * @return bool True if multisite and global terms enabled.
  */
 function global_terms_enabled() {
 	if ( ! is_multisite() ) {
 		return false;
 	}
 
 	static $global_terms = null;
 	if ( is_null( $global_terms ) ) {
 
 		/**
 		 * Filters whether global terms are enabled.
 		 *
 		 * Returning a non-null value from the filter will effectively short-circuit the function
 		 * and return the value of the 'global_terms_enabled' site option instead.
 		 *
 		 * @since 3.0.0
 		 *
 		 * @param null $enabled Whether global terms are enabled.
 		 */
 		$filter = apply_filters( 'global_terms_enabled', null );
 		if ( ! is_null( $filter ) ) {
 			$global_terms = (bool) $filter;
 		} else {
 			$global_terms = (bool) get_site_option( 'global_terms_enabled', false );
 		}
 	}
 	return $global_terms;
 }
 
 /**
  * Determines whether site meta is enabled.
  *
  * This function checks whether the 'blogmeta' database table exists. The result is saved as
  * a setting for the main network, making it essentially a global setting. Subsequent requests
  * will refer to this setting instead of running the query.
  *
  * @since 5.1.0
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
  * @return bool True if site meta is supported, false otherwise.
  */
 function is_site_meta_supported() {
 	global $wpdb;
 
 	if ( ! is_multisite() ) {
 		return false;
 	}
 
 	$network_id = get_main_network_id();
 
 	$supported = get_network_option( $network_id, 'site_meta_supported', false );
 	if ( false === $supported ) {
 		$supported = $wpdb->get_var( "SHOW TABLES LIKE '{$wpdb->blogmeta}'" ) ? 1 : 0;
 
 		update_network_option( $network_id, 'site_meta_supported', $supported );
 	}
 
 	return (bool) $supported;
 }
 
 /**
  * gmt_offset modification for smart timezone handling.
  *
  * Overrides the gmt_offset option if we have a timezone_string available.
  *
  * @since 2.8.0
  *
  * @return float|false Timezone GMT offset, false otherwise.
  */
 function wp_timezone_override_offset() {
 	$timezone_string = get_option( 'timezone_string' );
 	if ( ! $timezone_string ) {
 		return false;
 	}
 
 	$timezone_object = timezone_open( $timezone_string );
 	$datetime_object = date_create();
 	if ( false === $timezone_object || false === $datetime_object ) {
 		return false;
 	}
 	return round( timezone_offset_get( $timezone_object, $datetime_object ) / HOUR_IN_SECONDS, 2 );
 }
 
 /**
  * Sort-helper for timezones.
  *
  * @since 2.9.0
  * @access private
  *
  * @param array $a
  * @param array $b
  * @return int
  */
 function _wp_timezone_choice_usort_callback( $a, $b ) {
 	// Don't use translated versions of Etc.
 	if ( 'Etc' === $a['continent'] && 'Etc' === $b['continent'] ) {
 		// Make the order of these more like the old dropdown.
 		if ( 'GMT+' === substr( $a['city'], 0, 4 ) && 'GMT+' === substr( $b['city'], 0, 4 ) ) {
 			return -1 * ( strnatcasecmp( $a['city'], $b['city'] ) );
 		}
 		if ( 'UTC' === $a['city'] ) {
 			if ( 'GMT+' === substr( $b['city'], 0, 4 ) ) {
 				return 1;
 			}
 			return -1;
 		}
 		if ( 'UTC' === $b['city'] ) {
 			if ( 'GMT+' === substr( $a['city'], 0, 4 ) ) {
 				return -1;
 			}
 			return 1;
 		}
 		return strnatcasecmp( $a['city'], $b['city'] );
 	}
 	if ( $a['t_continent'] == $b['t_continent'] ) {
 		if ( $a['t_city'] == $b['t_city'] ) {
 			return strnatcasecmp( $a['t_subcity'], $b['t_subcity'] );
 		}
 		return strnatcasecmp( $a['t_city'], $b['t_city'] );
 	} else {
 		// Force Etc to the bottom of the list.
 		if ( 'Etc' === $a['continent'] ) {
 			return 1;
 		}
 		if ( 'Etc' === $b['continent'] ) {
 			return -1;
 		}
 		return strnatcasecmp( $a['t_continent'], $b['t_continent'] );
 	}
 }
 
 /**
  * Gives a nicely-formatted list of timezone strings.
  *
  * @since 2.9.0
  * @since 4.7.0 Added the `$locale` parameter.
  *
  * @param string $selected_zone Selected timezone.
  * @param string $locale        Optional. Locale to load the timezones in. Default current site locale.
  * @return string
  */
 function wp_timezone_choice( $selected_zone, $locale = null ) {
 	static $mo_loaded = false, $locale_loaded = null;
 
 	$continents = array( 'Africa', 'America', 'Antarctica', 'Arctic', 'Asia', 'Atlantic', 'Australia', 'Europe', 'Indian', 'Pacific' );
 
 	// Load translations for continents and cities.
 	if ( ! $mo_loaded || $locale !== $locale_loaded ) {
 		$locale_loaded = $locale ? $locale : get_locale();
 		$mofile        = WP_LANG_DIR . '/continents-cities-' . $locale_loaded . '.mo';
 		unload_textdomain( 'continents-cities' );
 		load_textdomain( 'continents-cities', $mofile );
 		$mo_loaded = true;
 	}
 
 	$zonen = array();
 	foreach ( timezone_identifiers_list() as $zone ) {
 		$zone = explode( '/', $zone );
 		if ( ! in_array( $zone[0], $continents, true ) ) {
 			continue;
 		}
 
 		// This determines what gets set and translated - we don't translate Etc/* strings here, they are done later.
 		$exists    = array(
 			0 => ( isset( $zone[0] ) && $zone[0] ),
 			1 => ( isset( $zone[1] ) && $zone[1] ),
 			2 => ( isset( $zone[2] ) && $zone[2] ),
 		);
 		$exists[3] = ( $exists[0] && 'Etc' !== $zone[0] );
 		$exists[4] = ( $exists[1] && $exists[3] );
 		$exists[5] = ( $exists[2] && $exists[3] );
 
 		// phpcs:disable WordPress.WP.I18n.LowLevelTranslationFunction,WordPress.WP.I18n.NonSingularStringLiteralText
 		$zonen[] = array(
 			'continent'   => ( $exists[0] ? $zone[0] : '' ),
 			'city'        => ( $exists[1] ? $zone[1] : '' ),
 			'subcity'     => ( $exists[2] ? $zone[2] : '' ),
 			't_continent' => ( $exists[3] ? translate( str_replace( '_', ' ', $zone[0] ), 'continents-cities' ) : '' ),
 			't_city'      => ( $exists[4] ? translate( str_replace( '_', ' ', $zone[1] ), 'continents-cities' ) : '' ),
 			't_subcity'   => ( $exists[5] ? translate( str_replace( '_', ' ', $zone[2] ), 'continents-cities' ) : '' ),
 		);
 		// phpcs:enable
 	}
 	usort( $zonen, '_wp_timezone_choice_usort_callback' );
 
 	$structure = array();
 
 	if ( empty( $selected_zone ) ) {
 		$structure[] = '<option selected="selected" value="">' . __( 'Select a city' ) . '</option>';
 	}
 
 	foreach ( $zonen as $key => $zone ) {
 		// Build value in an array to join later.
 		$value = array( $zone['continent'] );
 
 		if ( empty( $zone['city'] ) ) {
 			// It's at the continent level (generally won't happen).
 			$display = $zone['t_continent'];
 		} else {
 			// It's inside a continent group.
 
 			// Continent optgroup.
 			if ( ! isset( $zonen[ $key - 1 ] ) || $zonen[ $key - 1 ]['continent'] !== $zone['continent'] ) {
 				$label       = $zone['t_continent'];
 				$structure[] = '<optgroup label="' . esc_attr( $label ) . '">';
 			}
 
 			// Add the city to the value.
 			$value[] = $zone['city'];
 
 			$display = $zone['t_city'];
 			if ( ! empty( $zone['subcity'] ) ) {
 				// Add the subcity to the value.
 				$value[]  = $zone['subcity'];
 				$display .= ' - ' . $zone['t_subcity'];
 			}
 		}
 
 		// Build the value.
 		$value    = implode( '/', $value );
 		$selected = '';
 		if ( $value === $selected_zone ) {
 			$selected = 'selected="selected" ';
 		}
 		$structure[] = '<option ' . $selected . 'value="' . esc_attr( $value ) . '">' . esc_html( $display ) . '</option>';
 
 		// Close continent optgroup.
 		if ( ! empty( $zone['city'] ) && ( ! isset( $zonen[ $key + 1 ] ) || ( isset( $zonen[ $key + 1 ] ) && $zonen[ $key + 1 ]['continent'] !== $zone['continent'] ) ) ) {
 			$structure[] = '</optgroup>';
 		}
 	}
 
 	// Do UTC.
 	$structure[] = '<optgroup label="' . esc_attr__( 'UTC' ) . '">';
 	$selected    = '';
 	if ( 'UTC' === $selected_zone ) {
 		$selected = 'selected="selected" ';
 	}
 	$structure[] = '<option ' . $selected . 'value="' . esc_attr( 'UTC' ) . '">' . __( 'UTC' ) . '</option>';
 	$structure[] = '</optgroup>';
 
 	// Do manual UTC offsets.
 	$structure[]  = '<optgroup label="' . esc_attr__( 'Manual Offsets' ) . '">';
 	$offset_range = array(
 		-12,
 		-11.5,
 		-11,
 		-10.5,
 		-10,
 		-9.5,
 		-9,
 		-8.5,
 		-8,
 		-7.5,
 		-7,
 		-6.5,
 		-6,
 		-5.5,
 		-5,
 		-4.5,
 		-4,
 		-3.5,
 		-3,
 		-2.5,
 		-2,
 		-1.5,
 		-1,
 		-0.5,
 		0,
 		0.5,
 		1,
 		1.5,
 		2,
 		2.5,
 		3,
 		3.5,
 		4,
 		4.5,
 		5,
 		5.5,
 		5.75,
 		6,
 		6.5,
 		7,
 		7.5,
 		8,
 		8.5,
 		8.75,
 		9,
 		9.5,
 		10,
 		10.5,
 		11,
 		11.5,
 		12,
 		12.75,
 		13,
 		13.75,
 		14,
 	);
 	foreach ( $offset_range as $offset ) {
 		if ( 0 <= $offset ) {
 			$offset_name = '+' . $offset;
 		} else {
 			$offset_name = (string) $offset;
 		}
 
 		$offset_value = $offset_name;
 		$offset_name  = str_replace( array( '.25', '.5', '.75' ), array( ':15', ':30', ':45' ), $offset_name );
 		$offset_name  = 'UTC' . $offset_name;
 		$offset_value = 'UTC' . $offset_value;
 		$selected     = '';
 		if ( $offset_value === $selected_zone ) {
 			$selected = 'selected="selected" ';
 		}
 		$structure[] = '<option ' . $selected . 'value="' . esc_attr( $offset_value ) . '">' . esc_html( $offset_name ) . '</option>';
 
 	}
 	$structure[] = '</optgroup>';
 
 	return implode( "\n", $structure );
 }
 
 /**
  * Strip close comment and close php tags from file headers used by WP.
  *
  * @since 2.8.0
  * @access private
  *
  * @see https://core.trac.wordpress.org/ticket/8497
  *
  * @param string $str Header comment to clean up.
  * @return string
  */
 function _cleanup_header_comment( $str ) {
 	return trim( preg_replace( '/\s*(?:\*\/|\?>).*/', '', $str ) );
 }
 
 /**
  * Permanently delete comments or posts of any type that have held a status
  * of 'trash' for the number of days defined in EMPTY_TRASH_DAYS.
  *
  * The default value of `EMPTY_TRASH_DAYS` is 30 (days).
  *
  * @since 2.9.0
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  */
 function wp_scheduled_delete() {
 	global $wpdb;
 
 	$delete_timestamp = time() - ( DAY_IN_SECONDS * EMPTY_TRASH_DAYS );
 
 	$posts_to_delete = $wpdb->get_results( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wp_trash_meta_time' AND meta_value < %d", $delete_timestamp ), ARRAY_A );
 
 	foreach ( (array) $posts_to_delete as $post ) {
 		$post_id = (int) $post['post_id'];
 		if ( ! $post_id ) {
 			continue;
 		}
 
 		$del_post = get_post( $post_id );
 
 		if ( ! $del_post || 'trash' !== $del_post->post_status ) {
 			delete_post_meta( $post_id, '_wp_trash_meta_status' );
 			delete_post_meta( $post_id, '_wp_trash_meta_time' );
 		} else {
 			wp_delete_post( $post_id );
 		}
 	}
 
 	$comments_to_delete = $wpdb->get_results( $wpdb->prepare( "SELECT comment_id FROM $wpdb->commentmeta WHERE meta_key = '_wp_trash_meta_time' AND meta_value < %d", $delete_timestamp ), ARRAY_A );
 
 	foreach ( (array) $comments_to_delete as $comment ) {
 		$comment_id = (int) $comment['comment_id'];
 		if ( ! $comment_id ) {
 			continue;
 		}
 
 		$del_comment = get_comment( $comment_id );
 
 		if ( ! $del_comment || 'trash' !== $del_comment->comment_approved ) {
 			delete_comment_meta( $comment_id, '_wp_trash_meta_time' );
 			delete_comment_meta( $comment_id, '_wp_trash_meta_status' );
 		} else {
 			wp_delete_comment( $del_comment );
 		}
 	}
 }
 
 /**
  * Retrieve metadata from a file.
  *
  * Searches for metadata in the first 8 KB of a file, such as a plugin or theme.
  * Each piece of metadata must be on its own line. Fields can not span multiple
  * lines, the value will get cut at the end of the first line.
  *
  * If the file data is not within that first 8 KB, then the author should correct
  * their plugin file and move the data headers to the top.
  *
  * @link https://codex.wordpress.org/File_Header
  *
  * @since 2.9.0
  *
  * @param string $file            Absolute path to the file.
  * @param array  $default_headers List of headers, in the format `array( 'HeaderKey' => 'Header Name' )`.
  * @param string $context         Optional. If specified adds filter hook {@see 'extra_$context_headers'}.
  *                                Default empty.
  * @return string[] Array of file header values keyed by header name.
  */
 function get_file_data( $file, $default_headers, $context = '' ) {
 	// We don't need to write to the file, so just open for reading.
 	$fp = fopen( $file, 'r' );
 
 	if ( $fp ) {
 		// Pull only the first 8 KB of the file in.
 		$file_data = fread( $fp, 8 * KB_IN_BYTES );
 
 		// PHP will close file handle, but we are good citizens.
 		fclose( $fp );
 	} else {
 		$file_data = '';
 	}
 
 	// Make sure we catch CR-only line endings.
 	$file_data = str_replace( "\r", "\n", $file_data );
 
 	/**
 	 * Filters extra file headers by context.
 	 *
 	 * The dynamic portion of the hook name, `$context`, refers to
 	 * the context where extra headers might be loaded.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param array $extra_context_headers Empty array by default.
 	 */
 	$extra_headers = $context ? apply_filters( "extra_{$context}_headers", array() ) : array();
 	if ( $extra_headers ) {
 		$extra_headers = array_combine( $extra_headers, $extra_headers ); // Keys equal values.
 		$all_headers   = array_merge( $extra_headers, (array) $default_headers );
 	} else {
 		$all_headers = $default_headers;
 	}
 
 	foreach ( $all_headers as $field => $regex ) {
 		if ( preg_match( '/^(?:[ \t]*<\?php)?[ \t\/*#@]*' . preg_quote( $regex, '/' ) . ':(.*)$/mi', $file_data, $match ) && $match[1] ) {
 			$all_headers[ $field ] = _cleanup_header_comment( $match[1] );
 		} else {
 			$all_headers[ $field ] = '';
 		}
 	}
 
 	return $all_headers;
 }
 
 /**
  * Returns true.
  *
  * Useful for returning true to filters easily.
  *
  * @since 3.0.0
  *
  * @see __return_false()
  *
  * @return true True.
  */
 function __return_true() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore
 	return true;
 }
 
 /**
  * Returns false.
  *
  * Useful for returning false to filters easily.
  *
  * @since 3.0.0
  *
  * @see __return_true()
  *
  * @return false False.
  */
 function __return_false() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore
 	return false;
 }
 
 /**
  * Returns 0.
  *
  * Useful for returning 0 to filters easily.
  *
  * @since 3.0.0
  *
  * @return int 0.
  */
 function __return_zero() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore
 	return 0;
 }
 
 /**
  * Returns an empty array.
  *
  * Useful for returning an empty array to filters easily.
  *
  * @since 3.0.0
  *
  * @return array Empty array.
  */
 function __return_empty_array() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore
 	return array();
 }
 
 /**
  * Returns null.
  *
  * Useful for returning null to filters easily.
  *
  * @since 3.4.0
  *
  * @return null Null value.
  */
 function __return_null() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore
 	return null;
 }
 
 /**
  * Returns an empty string.
  *
  * Useful for returning an empty string to filters easily.
  *
  * @since 3.7.0
  *
  * @see __return_null()
  *
  * @return string Empty string.
  */
 function __return_empty_string() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore
 	return '';
 }
 
 /**
  * Send a HTTP header to disable content type sniffing in browsers which support it.
  *
  * @since 3.0.0
  *
  * @see https://blogs.msdn.com/ie/archive/2008/07/02/ie8-security-part-v-comprehensive-protection.aspx
  * @see https://src.chromium.org/viewvc/chrome?view=rev&revision=6985
  */
 function send_nosniff_header() {
 	header( 'X-Content-Type-Options: nosniff' );
 }
 
 /**
  * Return a MySQL expression for selecting the week number based on the start_of_week option.
  *
  * @ignore
  * @since 3.0.0
  *
  * @param string $column Database column.
  * @return string SQL clause.
  */
 function _wp_mysql_week( $column ) {
 	$start_of_week = (int) get_option( 'start_of_week' );
 	switch ( $start_of_week ) {
 		case 1:
 			return "WEEK( $column, 1 )";
 		case 2:
 		case 3:
 		case 4:
 		case 5:
 		case 6:
 			return "WEEK( DATE_SUB( $column, INTERVAL $start_of_week DAY ), 0 )";
 		case 0:
 		default:
 			return "WEEK( $column, 0 )";
 	}
 }
 
 /**
  * Find hierarchy loops using a callback function that maps object IDs to parent IDs.
  *
  * @since 3.1.0
  * @access private
  *
  * @param callable $callback      Function that accepts ( ID, $callback_args ) and outputs parent_ID.
  * @param int      $start         The ID to start the loop check at.
  * @param int      $start_parent  The parent_ID of $start to use instead of calling $callback( $start ).
  *                                Use null to always use $callback
  * @param array    $callback_args Optional. Additional arguments to send to $callback.
  * @return array IDs of all members of loop.
  */
 function wp_find_hierarchy_loop( $callback, $start, $start_parent, $callback_args = array() ) {
 	$override = is_null( $start_parent ) ? array() : array( $start => $start_parent );
 
 	$arbitrary_loop_member = wp_find_hierarchy_loop_tortoise_hare( $callback, $start, $override, $callback_args );
 	if ( ! $arbitrary_loop_member ) {
 		return array();
 	}
 
 	return wp_find_hierarchy_loop_tortoise_hare( $callback, $arbitrary_loop_member, $override, $callback_args, true );
 }
 
 /**
  * Use the "The Tortoise and the Hare" algorithm to detect loops.
  *
  * For every step of the algorithm, the hare takes two steps and the tortoise one.
  * If the hare ever laps the tortoise, there must be a loop.
  *
  * @since 3.1.0
  * @access private
  *
  * @param callable $callback      Function that accepts ( ID, callback_arg, ... ) and outputs parent_ID.
  * @param int      $start         The ID to start the loop check at.
  * @param array    $override      Optional. An array of ( ID => parent_ID, ... ) to use instead of $callback.
  *                                Default empty array.
  * @param array    $callback_args Optional. Additional arguments to send to $callback. Default empty array.
  * @param bool     $_return_loop  Optional. Return loop members or just detect presence of loop? Only set
  *                                to true if you already know the given $start is part of a loop (otherwise
  *                                the returned array might include branches). Default false.
  * @return mixed Scalar ID of some arbitrary member of the loop, or array of IDs of all members of loop if
  *               $_return_loop
  */
 function wp_find_hierarchy_loop_tortoise_hare( $callback, $start, $override = array(), $callback_args = array(), $_return_loop = false ) {
 	$tortoise        = $start;
 	$hare            = $start;
 	$evanescent_hare = $start;
 	$return          = array();
 
 	// Set evanescent_hare to one past hare.
 	// Increment hare two steps.
 	while (
 		$tortoise
 	&&
 		( $evanescent_hare = isset( $override[ $hare ] ) ? $override[ $hare ] : call_user_func_array( $callback, array_merge( array( $hare ), $callback_args ) ) )
 	&&
 		( $hare = isset( $override[ $evanescent_hare ] ) ? $override[ $evanescent_hare ] : call_user_func_array( $callback, array_merge( array( $evanescent_hare ), $callback_args ) ) )
 	) {
 		if ( $_return_loop ) {
 			$return[ $tortoise ]        = true;
 			$return[ $evanescent_hare ] = true;
 			$return[ $hare ]            = true;
 		}
 
 		// Tortoise got lapped - must be a loop.
 		if ( $tortoise == $evanescent_hare || $tortoise == $hare ) {
 			return $_return_loop ? $return : $tortoise;
 		}
 
 		// Increment tortoise by one step.
 		$tortoise = isset( $override[ $tortoise ] ) ? $override[ $tortoise ] : call_user_func_array( $callback, array_merge( array( $tortoise ), $callback_args ) );
 	}
 
 	return false;
 }
 
 /**
  * Send a HTTP header to limit rendering of pages to same origin iframes.
  *
  * @since 3.1.3
  *
  * @see https://developer.mozilla.org/en/the_x-frame-options_response_header
  */
 function send_frame_options_header() {
 	header( 'X-Frame-Options: SAMEORIGIN' );
 }
 
 /**
  * Retrieve a list of protocols to allow in HTML attributes.
  *
  * @since 3.3.0
  * @since 4.3.0 Added 'webcal' to the protocols array.
  * @since 4.7.0 Added 'urn' to the protocols array.
  * @since 5.3.0 Added 'sms' to the protocols array.
  * @since 5.6.0 Added 'irc6' and 'ircs' to the protocols array.
  *
  * @see wp_kses()
  * @see esc_url()
  *
  * @return string[] Array of allowed protocols. Defaults to an array containing 'http', 'https',
  *                  'ftp', 'ftps', 'mailto', 'news', 'irc', 'irc6', 'ircs', 'gopher', 'nntp', 'feed',
  *                  'telnet', 'mms', 'rtsp', 'sms', 'svn', 'tel', 'fax', 'xmpp', 'webcal', and 'urn'.
  *                  This covers all common link protocols, except for 'javascript' which should not
  *                  be allowed for untrusted users.
  */
 function wp_allowed_protocols() {
 	static $protocols = array();
 
 	if ( empty( $protocols ) ) {
 		$protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'irc6', 'ircs', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'sms', 'svn', 'tel', 'fax', 'xmpp', 'webcal', 'urn' );
 	}
 
 	if ( ! did_action( 'wp_loaded' ) ) {
 		/**
 		 * Filters the list of protocols allowed in HTML attributes.
 		 *
 		 * @since 3.0.0
 		 *
 		 * @param string[] $protocols Array of allowed protocols e.g. 'http', 'ftp', 'tel', and more.
 		 */
 		$protocols = array_unique( (array) apply_filters( 'kses_allowed_protocols', $protocols ) );
 	}
 
 	return $protocols;
 }
 
 /**
  * Return a comma-separated string of functions that have been called to get
  * to the current point in code.
  *
  * @since 3.4.0
  *
  * @see https://core.trac.wordpress.org/ticket/19589
  *
  * @param string $ignore_class Optional. A class to ignore all function calls within - useful
  *                             when you want to just give info about the callee. Default null.
  * @param int    $skip_frames  Optional. A number of stack frames to skip - useful for unwinding
  *                             back to the source of the issue. Default 0.
  * @param bool   $pretty       Optional. Whether or not you want a comma separated string or raw
  *                             array returned. Default true.
  * @return string|array Either a string containing a reversed comma separated trace or an array
  *                      of individual calls.
  */
 function wp_debug_backtrace_summary( $ignore_class = null, $skip_frames = 0, $pretty = true ) {
 	static $truncate_paths;
 
 	$trace       = debug_backtrace( false );
 	$caller      = array();
 	$check_class = ! is_null( $ignore_class );
 	$skip_frames++; // Skip this function.
 
 	if ( ! isset( $truncate_paths ) ) {
 		$truncate_paths = array(
 			wp_normalize_path( WP_CONTENT_DIR ),
 			wp_normalize_path( ABSPATH ),
 		);
 	}
 
 	foreach ( $trace as $call ) {
 		if ( $skip_frames > 0 ) {
 			$skip_frames--;
 		} elseif ( isset( $call['class'] ) ) {
 			if ( $check_class && $ignore_class == $call['class'] ) {
 				continue; // Filter out calls.
 			}
 
 			$caller[] = "{$call['class']}{$call['type']}{$call['function']}";
 		} else {
 			if ( in_array( $call['function'], array( 'do_action', 'apply_filters', 'do_action_ref_array', 'apply_filters_ref_array' ), true ) ) {
 				$caller[] = "{$call['function']}('{$call['args'][0]}')";
 			} elseif ( in_array( $call['function'], array( 'include', 'include_once', 'require', 'require_once' ), true ) ) {
 				$filename = isset( $call['args'][0] ) ? $call['args'][0] : '';
 				$caller[] = $call['function'] . "('" . str_replace( $truncate_paths, '', wp_normalize_path( $filename ) ) . "')";
 			} else {
 				$caller[] = $call['function'];
 			}
 		}
 	}
 	if ( $pretty ) {
 		return implode( ', ', array_reverse( $caller ) );
 	} else {
 		return $caller;
 	}
 }
 
 /**
  * Retrieve IDs that are not already present in the cache.
  *
  * @since 3.4.0
  * @access private
  *
  * @param int[]  $object_ids Array of IDs.
  * @param string $cache_key  The cache bucket to check against.
  * @return int[] Array of IDs not present in the cache.
  */
 function _get_non_cached_ids( $object_ids, $cache_key ) {
 	$non_cached_ids = array();
 	$cache_values   = wp_cache_get_multiple( $object_ids, $cache_key );
 
 	foreach ( $cache_values as $id => $value ) {
 		if ( ! $value ) {
 			$non_cached_ids[] = (int) $id;
 		}
 	}
 
 	return $non_cached_ids;
 }
 
 /**
  * Test if the current device has the capability to upload files.
  *
  * @since 3.4.0
  * @access private
  *
  * @return bool Whether the device is able to upload files.
  */
 function _device_can_upload() {
 	if ( ! wp_is_mobile() ) {
 		return true;
 	}
 
 	$ua = $_SERVER['HTTP_USER_AGENT'];
 
 	if ( strpos( $ua, 'iPhone' ) !== false
 		|| strpos( $ua, 'iPad' ) !== false
 		|| strpos( $ua, 'iPod' ) !== false ) {
 			return preg_match( '#OS ([\d_]+) like Mac OS X#', $ua, $version ) && version_compare( $version[1], '6', '>=' );
 	}
 
 	return true;
 }
 
 /**
  * Test if a given path is a stream URL
  *
  * @since 3.5.0
  *
  * @param string $path The resource path or URL.
  * @return bool True if the path is a stream URL.
  */
 function wp_is_stream( $path ) {
 	$scheme_separator = strpos( $path, '://' );
 
 	if ( false === $scheme_separator ) {
 		// $path isn't a stream.
 		return false;
 	}
 
 	$stream = substr( $path, 0, $scheme_separator );
 
 	return in_array( $stream, stream_get_wrappers(), true );
 }
 
 /**
  * Test if the supplied date is valid for the Gregorian calendar.
  *
  * @since 3.5.0
  *
  * @link https://www.php.net/manual/en/function.checkdate.php
  *
  * @param int    $month       Month number.
  * @param int    $day         Day number.
  * @param int    $year        Year number.
  * @param string $source_date The date to filter.
  * @return bool True if valid date, false if not valid date.
  */
 function wp_checkdate( $month, $day, $year, $source_date ) {
 	/**
 	 * Filters whether the given date is valid for the Gregorian calendar.
 	 *
 	 * @since 3.5.0
 	 *
 	 * @param bool   $checkdate   Whether the given date is valid.
 	 * @param string $source_date Date to check.
 	 */
 	return apply_filters( 'wp_checkdate', checkdate( $month, $day, $year ), $source_date );
 }
 
 /**
  * Load the auth check for monitoring whether the user is still logged in.
  *
  * Can be disabled with remove_action( 'admin_enqueue_scripts', 'wp_auth_check_load' );
  *
  * This is disabled for certain screens where a login screen could cause an
  * inconvenient interruption. A filter called {@see 'wp_auth_check_load'} can be used
  * for fine-grained control.
  *
  * @since 3.6.0
  */
 function wp_auth_check_load() {
 	if ( ! is_admin() && ! is_user_logged_in() ) {
 		return;
 	}
 
 	if ( defined( 'IFRAME_REQUEST' ) ) {
 		return;
 	}
 
 	$screen = get_current_screen();
 	$hidden = array( 'update', 'update-network', 'update-core', 'update-core-network', 'upgrade', 'upgrade-network', 'network' );
 	$show   = ! in_array( $screen->id, $hidden, true );
 
 	/**
 	 * Filters whether to load the authentication check.
 	 *
 	 * Returning a falsey value from the filter will effectively short-circuit
 	 * loading the authentication check.
 	 *
 	 * @since 3.6.0
 	 *
 	 * @param bool      $show   Whether to load the authentication check.
 	 * @param WP_Screen $screen The current screen object.
 	 */
 	if ( apply_filters( 'wp_auth_check_load', $show, $screen ) ) {
 		wp_enqueue_style( 'wp-auth-check' );
 		wp_enqueue_script( 'wp-auth-check' );
 
 		add_action( 'admin_print_footer_scripts', 'wp_auth_check_html', 5 );
 		add_action( 'wp_print_footer_scripts', 'wp_auth_check_html', 5 );
 	}
 }
 
 /**
  * Output the HTML that shows the wp-login dialog when the user is no longer logged in.
  *
  * @since 3.6.0
  */
 function wp_auth_check_html() {
 	$login_url      = wp_login_url();
 	$current_domain = ( is_ssl() ? 'https://' : 'http://' ) . $_SERVER['HTTP_HOST'];
 	$same_domain    = ( strpos( $login_url, $current_domain ) === 0 );
 
 	/**
 	 * Filters whether the authentication check originated at the same domain.
 	 *
 	 * @since 3.6.0
 	 *
 	 * @param bool $same_domain Whether the authentication check originated at the same domain.
 	 */
 	$same_domain = apply_filters( 'wp_auth_check_same_domain', $same_domain );
 	$wrap_class  = $same_domain ? 'hidden' : 'hidden fallback';
 
 	?>
 	<div id="wp-auth-check-wrap" class="<?php echo $wrap_class; ?>">
 	<div id="wp-auth-check-bg"></div>
 	<div id="wp-auth-check">
 	<button type="button" class="wp-auth-check-close button-link"><span class="screen-reader-text"><?php _e( 'Close dialog' ); ?></span></button>
 	<?php
 
 	if ( $same_domain ) {
 		$login_src = add_query_arg(
 			array(
 				'interim-login' => '1',
 				'wp_lang'       => get_user_locale(),
 			),
 			$login_url
 		);
 		?>
 		<div id="wp-auth-check-form" class="loading" data-src="<?php echo esc_url( $login_src ); ?>"></div>
 		<?php
 	}
 
 	?>
 	<div class="wp-auth-fallback">
 		<p><b class="wp-auth-fallback-expired" tabindex="0"><?php _e( 'Session expired' ); ?></b></p>
 		<p><a href="<?php echo esc_url( $login_url ); ?>" target="_blank"><?php _e( 'Please log in again.' ); ?></a>
 		<?php _e( 'The login page will open in a new tab. After logging in you can close it and return to this page.' ); ?></p>
 	</div>
 	</div>
 	</div>
 	<?php
 }
 
 /**
  * Check whether a user is still logged in, for the heartbeat.
  *
  * Send a result that shows a log-in box if the user is no longer logged in,
  * or if their cookie is within the grace period.
  *
  * @since 3.6.0
  *
  * @global int $login_grace_period
  *
  * @param array $response  The Heartbeat response.
  * @return array The Heartbeat response with 'wp-auth-check' value set.
  */
 function wp_auth_check( $response ) {
 	$response['wp-auth-check'] = is_user_logged_in() && empty( $GLOBALS['login_grace_period'] );
 	return $response;
 }
 
 /**
  * Return RegEx body to liberally match an opening HTML tag.
  *
  * Matches an opening HTML tag that:
  * 1. Is self-closing or
  * 2. Has no body but has a closing tag of the same name or
  * 3. Contains a body and a closing tag of the same name
  *
  * Note: this RegEx does not balance inner tags and does not attempt
  * to produce valid HTML
  *
  * @since 3.6.0
  *
  * @param string $tag An HTML tag name. Example: 'video'.
  * @return string Tag RegEx.
  */
 function get_tag_regex( $tag ) {
 	if ( empty( $tag ) ) {
 		return '';
 	}
 	return sprintf( '<%1$s[^<]*(?:>[\s\S]*<\/%1$s>|\s*\/>)', tag_escape( $tag ) );
 }
 
 /**
  * Retrieve a canonical form of the provided charset appropriate for passing to PHP
  * functions such as htmlspecialchars() and charset HTML attributes.
  *
  * @since 3.6.0
  * @access private
  *
  * @see https://core.trac.wordpress.org/ticket/23688
  *
  * @param string $charset A charset name.
  * @return string The canonical form of the charset.
  */
 function _canonical_charset( $charset ) {
 	if ( 'utf-8' === strtolower( $charset ) || 'utf8' === strtolower( $charset ) ) {
 
 		return 'UTF-8';
 	}
 
 	if ( 'iso-8859-1' === strtolower( $charset ) || 'iso8859-1' === strtolower( $charset ) ) {
 
 		return 'ISO-8859-1';
 	}
 
 	return $charset;
 }
 
 /**
  * Set the mbstring internal encoding to a binary safe encoding when func_overload
  * is enabled.
  *
  * When mbstring.func_overload is in use for multi-byte encodings, the results from
  * strlen() and similar functions respect the utf8 characters, causing binary data
  * to return incorrect lengths.
  *
  * This function overrides the mbstring encoding to a binary-safe encoding, and
  * resets it to the users expected encoding afterwards through the
  * `reset_mbstring_encoding` function.
  *
  * It is safe to recursively call this function, however each
  * `mbstring_binary_safe_encoding()` call must be followed up with an equal number
  * of `reset_mbstring_encoding()` calls.
  *
  * @since 3.7.0
  *
  * @see reset_mbstring_encoding()
  *
  * @param bool $reset Optional. Whether to reset the encoding back to a previously-set encoding.
  *                    Default false.
  */
 function mbstring_binary_safe_encoding( $reset = false ) {
 	static $encodings  = array();
 	static $overloaded = null;
 
 	if ( is_null( $overloaded ) ) {
 		if ( function_exists( 'mb_internal_encoding' )
 			&& ( (int) ini_get( 'mbstring.func_overload' ) & 2 ) // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
 		) {
 			$overloaded = true;
 		} else {
 			$overloaded = false;
 		}
 	}
 
 	if ( false === $overloaded ) {
 		return;
 	}
 
 	if ( ! $reset ) {
 		$encoding = mb_internal_encoding();
 		array_push( $encodings, $encoding );
 		mb_internal_encoding( 'ISO-8859-1' );
 	}
 
 	if ( $reset && $encodings ) {
 		$encoding = array_pop( $encodings );
 		mb_internal_encoding( $encoding );
 	}
 }
 
 /**
  * Reset the mbstring internal encoding to a users previously set encoding.
  *
  * @see mbstring_binary_safe_encoding()
  *
  * @since 3.7.0
  */
 function reset_mbstring_encoding() {
 	mbstring_binary_safe_encoding( true );
 }
 
 /**
  * Filter/validate a variable as a boolean.
  *
  * Alternative to `filter_var( $var, FILTER_VALIDATE_BOOLEAN )`.
  *
  * @since 4.0.0
  *
  * @param mixed $var Boolean value to validate.
  * @return bool Whether the value is validated.
  */
 function wp_validate_boolean( $var ) {
 	if ( is_bool( $var ) ) {
 		return $var;
 	}
 
 	if ( is_string( $var ) && 'false' === strtolower( $var ) ) {
 		return false;
 	}
 
 	return (bool) $var;
 }
 
 /**
  * Delete a file
  *
  * @since 4.2.0
  *
  * @param string $file The path to the file to delete.
  */
 function wp_delete_file( $file ) {
 	/**
 	 * Filters the path of the file to delete.
 	 *
 	 * @since 2.1.0
 	 *
 	 * @param string $file Path to the file to delete.
 	 */
 	$delete = apply_filters( 'wp_delete_file', $file );
 	if ( ! empty( $delete ) ) {
 		@unlink( $delete );
 	}
 }
 
 /**
  * Deletes a file if its path is within the given directory.
  *
  * @since 4.9.7
  *
  * @param string $file      Absolute path to the file to delete.
  * @param string $directory Absolute path to a directory.
  * @return bool True on success, false on failure.
  */
 function wp_delete_file_from_directory( $file, $directory ) {
 	if ( wp_is_stream( $file ) ) {
 		$real_file      = $file;
 		$real_directory = $directory;
 	} else {
 		$real_file      = realpath( wp_normalize_path( $file ) );
 		$real_directory = realpath( wp_normalize_path( $directory ) );
 	}
 
 	if ( false !== $real_file ) {
 		$real_file = wp_normalize_path( $real_file );
 	}
 
 	if ( false !== $real_directory ) {
 		$real_directory = wp_normalize_path( $real_directory );
 	}
 
 	if ( false === $real_file || false === $real_directory || strpos( $real_file, trailingslashit( $real_directory ) ) !== 0 ) {
 		return false;
 	}
 
 	wp_delete_file( $file );
 
 	return true;
 }
 
 /**
  * Outputs a small JS snippet on preview tabs/windows to remove `window.name` on unload.
  *
  * This prevents reusing the same tab for a preview when the user has navigated away.
  *
  * @since 4.3.0
  *
  * @global WP_Post $post Global post object.
  */
 function wp_post_preview_js() {
 	global $post;
 
 	if ( ! is_preview() || empty( $post ) ) {
 		return;
 	}
 
 	// Has to match the window name used in post_submit_meta_box().
 	$name = 'wp-preview-' . (int) $post->ID;
 
 	?>
 	<script>
 	( function() {
 		var query = document.location.search;
 
 		if ( query && query.indexOf( 'preview=true' ) !== -1 ) {
 			window.name = '<?php echo $name; ?>';
 		}
 
 		if ( window.addEventListener ) {
 			window.addEventListener( 'unload', function() { window.name = ''; }, false );
 		}
 	}());
 	</script>
 	<?php
 }
 
 /**
  * Parses and formats a MySQL datetime (Y-m-d H:i:s) for ISO8601 (Y-m-d\TH:i:s).
  *
  * Explicitly strips timezones, as datetimes are not saved with any timezone
  * information. Including any information on the offset could be misleading.
  *
  * Despite historical function name, the output does not conform to RFC3339 format,
  * which must contain timezone.
  *
  * @since 4.4.0
  *
  * @param string $date_string Date string to parse and format.
  * @return string Date formatted for ISO8601 without time zone.
  */
 function mysql_to_rfc3339( $date_string ) {
 	return mysql2date( 'Y-m-d\TH:i:s', $date_string, false );
 }
 
 /**
  * Attempts to raise the PHP memory limit for memory intensive processes.
  *
  * Only allows raising the existing limit and prevents lowering it.
  *
  * @since 4.6.0
  *
  * @param string $context Optional. Context in which the function is called. Accepts either 'admin',
  *                        'image', or an arbitrary other context. If an arbitrary context is passed,
  *                        the similarly arbitrary {@see '$context_memory_limit'} filter will be
  *                        invoked. Default 'admin'.
  * @return int|string|false The limit that was set or false on failure.
  */
 function wp_raise_memory_limit( $context = 'admin' ) {
 	// Exit early if the limit cannot be changed.
 	if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {
 		return false;
 	}
 
 	$current_limit     = ini_get( 'memory_limit' );
 	$current_limit_int = wp_convert_hr_to_bytes( $current_limit );
 
 	if ( -1 === $current_limit_int ) {
 		return false;
 	}
 
 	$wp_max_limit     = WP_MAX_MEMORY_LIMIT;
 	$wp_max_limit_int = wp_convert_hr_to_bytes( $wp_max_limit );
 	$filtered_limit   = $wp_max_limit;
 
 	switch ( $context ) {
 		case 'admin':
 			/**
 			 * Filters the maximum memory limit available for administration screens.
 			 *
 			 * This only applies to administrators, who may require more memory for tasks
 			 * like updates. Memory limits when processing images (uploaded or edited by
 			 * users of any role) are handled separately.
 			 *
 			 * The `WP_MAX_MEMORY_LIMIT` constant specifically defines the maximum memory
 			 * limit available when in the administration back end. The default is 256M
 			 * (256 megabytes of memory) or the original `memory_limit` php.ini value if
 			 * this is higher.
 			 *
 			 * @since 3.0.0
 			 * @since 4.6.0 The default now takes the original `memory_limit` into account.
 			 *
 			 * @param int|string $filtered_limit The maximum WordPress memory limit. Accepts an integer
 			 *                                   (bytes), or a shorthand string notation, such as '256M'.
 			 */
 			$filtered_limit = apply_filters( 'admin_memory_limit', $filtered_limit );
 			break;
 
 		case 'image':
 			/**
 			 * Filters the memory limit allocated for image manipulation.
 			 *
 			 * @since 3.5.0
 			 * @since 4.6.0 The default now takes the original `memory_limit` into account.
 			 *
 			 * @param int|string $filtered_limit Maximum memory limit to allocate for images.
 			 *                                   Default `WP_MAX_MEMORY_LIMIT` or the original
 			 *                                   php.ini `memory_limit`, whichever is higher.
 			 *                                   Accepts an integer (bytes), or a shorthand string
 			 *                                   notation, such as '256M'.
 			 */
 			$filtered_limit = apply_filters( 'image_memory_limit', $filtered_limit );
 			break;
 
 		default:
 			/**
 			 * Filters the memory limit allocated for arbitrary contexts.
 			 *
 			 * The dynamic portion of the hook name, `$context`, refers to an arbitrary
 			 * context passed on calling the function. This allows for plugins to define
 			 * their own contexts for raising the memory limit.
 			 *
 			 * @since 4.6.0
 			 *
 			 * @param int|string $filtered_limit Maximum memory limit to allocate for images.
 			 *                                   Default '256M' or the original php.ini `memory_limit`,
 			 *                                   whichever is higher. Accepts an integer (bytes), or a
 			 *                                   shorthand string notation, such as '256M'.
 			 */
 			$filtered_limit = apply_filters( "{$context}_memory_limit", $filtered_limit );
 			break;
 	}
 
 	$filtered_limit_int = wp_convert_hr_to_bytes( $filtered_limit );
 
 	if ( -1 === $filtered_limit_int || ( $filtered_limit_int > $wp_max_limit_int && $filtered_limit_int > $current_limit_int ) ) {
 		if ( false !== ini_set( 'memory_limit', $filtered_limit ) ) {
 			return $filtered_limit;
 		} else {
 			return false;
 		}
 	} elseif ( -1 === $wp_max_limit_int || $wp_max_limit_int > $current_limit_int ) {
 		if ( false !== ini_set( 'memory_limit', $wp_max_limit ) ) {
 			return $wp_max_limit;
 		} else {
 			return false;
 		}
 	}
 
 	return false;
 }
 
 /**
  * Generate a random UUID (version 4).
  *
  * @since 4.7.0
  *
  * @return string UUID.
  */
 function wp_generate_uuid4() {
 	return sprintf(
 		'%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
 		mt_rand( 0, 0xffff ),
 		mt_rand( 0, 0xffff ),
 		mt_rand( 0, 0xffff ),
 		mt_rand( 0, 0x0fff ) | 0x4000,
 		mt_rand( 0, 0x3fff ) | 0x8000,
 		mt_rand( 0, 0xffff ),
 		mt_rand( 0, 0xffff ),
 		mt_rand( 0, 0xffff )
 	);
 }
 
 /**
  * Validates that a UUID is valid.
  *
  * @since 4.9.0
  *
  * @param mixed $uuid    UUID to check.
  * @param int   $version Specify which version of UUID to check against. Default is none,
  *                       to accept any UUID version. Otherwise, only version allowed is `4`.
  * @return bool The string is a valid UUID or false on failure.
  */
 function wp_is_uuid( $uuid, $version = null ) {
 
 	if ( ! is_string( $uuid ) ) {
 		return false;
 	}
 
 	if ( is_numeric( $version ) ) {
 		if ( 4 !== (int) $version ) {
 			_doing_it_wrong( __FUNCTION__, __( 'Only UUID V4 is supported at this time.' ), '4.9.0' );
 			return false;
 		}
 		$regex = '/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/';
 	} else {
 		$regex = '/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/';
 	}
 
 	return (bool) preg_match( $regex, $uuid );
 }
 
 /**
  * Gets unique ID.
  *
  * This is a PHP implementation of Underscore's uniqueId method. A static variable
  * contains an integer that is incremented with each call. This number is returned
  * with the optional prefix. As such the returned value is not universally unique,
  * but it is unique across the life of the PHP process.
  *
  * @since 5.0.3
  *
  * @param string $prefix Prefix for the returned ID.
  * @return string Unique ID.
  */
 function wp_unique_id( $prefix = '' ) {
 	static $id_counter = 0;
 	return $prefix . (string) ++$id_counter;
 }
 
 /**
  * Gets last changed date for the specified cache group.
  *
  * @since 4.7.0
  *
  * @param string $group Where the cache contents are grouped.
  * @return string UNIX timestamp with microseconds representing when the group was last changed.
  */
 function wp_cache_get_last_changed( $group ) {
 	$last_changed = wp_cache_get( 'last_changed', $group );
 
 	if ( ! $last_changed ) {
 		$last_changed = microtime();
 		wp_cache_set( 'last_changed', $last_changed, $group );
 	}
 
 	return $last_changed;
 }
 
 /**
  * Send an email to the old site admin email address when the site admin email address changes.
  *
  * @since 4.9.0
  *
  * @param string $old_email   The old site admin email address.
  * @param string $new_email   The new site admin email address.
  * @param string $option_name The relevant database option name.
  */
 function wp_site_admin_email_change_notification( $old_email, $new_email, $option_name ) {
 	$send = true;
 
 	// Don't send the notification to the default 'admin_email' value.
 	if ( 'you@example.com' === $old_email ) {
 		$send = false;
 	}
 
 	/**
 	 * Filters whether to send the site admin email change notification email.
 	 *
 	 * @since 4.9.0
 	 *
 	 * @param bool   $send      Whether to send the email notification.
 	 * @param string $old_email The old site admin email address.
 	 * @param string $new_email The new site admin email address.
 	 */
 	$send = apply_filters( 'send_site_admin_email_change_email', $send, $old_email, $new_email );
 
 	if ( ! $send ) {
 		return;
 	}
 
 	/* translators: Do not translate OLD_EMAIL, NEW_EMAIL, SITENAME, SITEURL: those are placeholders. */
 	$email_change_text = __(
 		'Hi,
 
 This notice confirms that the admin email address was changed on ###SITENAME###.
 
 The new admin email address is ###NEW_EMAIL###.
 
 This email has been sent to ###OLD_EMAIL###
 
 Regards,
 All at ###SITENAME###
 ###SITEURL###'
 	);
 
 	$email_change_email = array(
 		'to'      => $old_email,
 		/* translators: Site admin email change notification email subject. %s: Site title. */
 		'subject' => __( '[%s] Admin Email Changed' ),
 		'message' => $email_change_text,
 		'headers' => '',
 	);
 
 	// Get site name.
 	$site_name = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 
 	/**
 	 * Filters the contents of the email notification sent when the site admin email address is changed.
 	 *
 	 * @since 4.9.0
 	 *
 	 * @param array $email_change_email {
 	 *     Used to build wp_mail().
 	 *
 	 *     @type string $to      The intended recipient.
 	 *     @type string $subject The subject of the email.
 	 *     @type string $message The content of the email.
 	 *         The following strings have a special meaning and will get replaced dynamically:
 	 *         - ###OLD_EMAIL### The old site admin email address.
 	 *         - ###NEW_EMAIL### The new site admin email address.
 	 *         - ###SITENAME###  The name of the site.
 	 *         - ###SITEURL###   The URL to the site.
 	 *     @type string $headers Headers.
 	 * }
 	 * @param string $old_email The old site admin email address.
 	 * @param string $new_email The new site admin email address.
 	 */
 	$email_change_email = apply_filters( 'site_admin_email_change_email', $email_change_email, $old_email, $new_email );
 
 	$email_change_email['message'] = str_replace( '###OLD_EMAIL###', $old_email, $email_change_email['message'] );
 	$email_change_email['message'] = str_replace( '###NEW_EMAIL###', $new_email, $email_change_email['message'] );
 	$email_change_email['message'] = str_replace( '###SITENAME###', $site_name, $email_change_email['message'] );
 	$email_change_email['message'] = str_replace( '###SITEURL###', home_url(), $email_change_email['message'] );
 
 	wp_mail(
 		$email_change_email['to'],
 		sprintf(
 			$email_change_email['subject'],
 			$site_name
 		),
 		$email_change_email['message'],
 		$email_change_email['headers']
 	);
 }
 
 /**
  * Return an anonymized IPv4 or IPv6 address.
  *
  * @since 4.9.6 Abstracted from `WP_Community_Events::get_unsafe_client_ip()`.
  *
  * @param string $ip_addr       The IPv4 or IPv6 address to be anonymized.
  * @param bool   $ipv6_fallback Optional. Whether to return the original IPv6 address if the needed functions
  *                              to anonymize it are not present. Default false, return `::` (unspecified address).
  * @return string  The anonymized IP address.
  */
 function wp_privacy_anonymize_ip( $ip_addr, $ipv6_fallback = false ) {
 	// Detect what kind of IP address this is.
 	$ip_prefix = '';
 	$is_ipv6   = substr_count( $ip_addr, ':' ) > 1;
 	$is_ipv4   = ( 3 === substr_count( $ip_addr, '.' ) );
 
 	if ( $is_ipv6 && $is_ipv4 ) {
 		// IPv6 compatibility mode, temporarily strip the IPv6 part, and treat it like IPv4.
 		$ip_prefix = '::ffff:';
 		$ip_addr   = preg_replace( '/^\[?[0-9a-f:]*:/i', '', $ip_addr );
 		$ip_addr   = str_replace( ']', '', $ip_addr );
 		$is_ipv6   = false;
 	}
 
 	if ( $is_ipv6 ) {
 		// IPv6 addresses will always be enclosed in [] if there's a port.
 		$left_bracket  = strpos( $ip_addr, '[' );
 		$right_bracket = strpos( $ip_addr, ']' );
 		$percent       = strpos( $ip_addr, '%' );
 		$netmask       = 'ffff:ffff:ffff:ffff:0000:0000:0000:0000';
 
 		// Strip the port (and [] from IPv6 addresses), if they exist.
 		if ( false !== $left_bracket && false !== $right_bracket ) {
 			$ip_addr = substr( $ip_addr, $left_bracket + 1, $right_bracket - $left_bracket - 1 );
 		} elseif ( false !== $left_bracket || false !== $right_bracket ) {
 			// The IP has one bracket, but not both, so it's malformed.
 			return '::';
 		}
 
 		// Strip the reachability scope.
 		if ( false !== $percent ) {
 			$ip_addr = substr( $ip_addr, 0, $percent );
 		}
 
 		// No invalid characters should be left.
 		if ( preg_match( '/[^0-9a-f:]/i', $ip_addr ) ) {
 			return '::';
 		}
 
 		// Partially anonymize the IP by reducing it to the corresponding network ID.
 		if ( function_exists( 'inet_pton' ) && function_exists( 'inet_ntop' ) ) {
 			$ip_addr = inet_ntop( inet_pton( $ip_addr ) & inet_pton( $netmask ) );
 			if ( false === $ip_addr ) {
 				return '::';
 			}
 		} elseif ( ! $ipv6_fallback ) {
 			return '::';
 		}
 	} elseif ( $is_ipv4 ) {
 		// Strip any port and partially anonymize the IP.
 		$last_octet_position = strrpos( $ip_addr, '.' );
 		$ip_addr             = substr( $ip_addr, 0, $last_octet_position ) . '.0';
 	} else {
 		return '0.0.0.0';
 	}
 
 	// Restore the IPv6 prefix to compatibility mode addresses.
 	return $ip_prefix . $ip_addr;
 }
 
 /**
  * Return uniform "anonymous" data by type.
  *
  * @since 4.9.6
  *
  * @param string $type The type of data to be anonymized.
  * @param string $data Optional The data to be anonymized.
  * @return string The anonymous data for the requested type.
  */
 function wp_privacy_anonymize_data( $type, $data = '' ) {
 
 	switch ( $type ) {
 		case 'email':
 			$anonymous = 'deleted@site.invalid';
 			break;
 		case 'url':
 			$anonymous = 'https://site.invalid';
 			break;
 		case 'ip':
 			$anonymous = wp_privacy_anonymize_ip( $data );
 			break;
 		case 'date':
 			$anonymous = '0000-00-00 00:00:00';
 			break;
 		case 'text':
 			/* translators: Deleted text. */
 			$anonymous = __( '[deleted]' );
 			break;
 		case 'longtext':
 			/* translators: Deleted long text. */
 			$anonymous = __( 'This content was deleted by the author.' );
 			break;
 		default:
 			$anonymous = '';
 			break;
 	}
 
 	/**
 	 * Filters the anonymous data for each type.
 	 *
 	 * @since 4.9.6
 	 *
 	 * @param string $anonymous Anonymized data.
 	 * @param string $type      Type of the data.
 	 * @param string $data      Original data.
 	 */
 	return apply_filters( 'wp_privacy_anonymize_data', $anonymous, $type, $data );
 }
 
 /**
  * Returns the directory used to store personal data export files.
  *
  * @since 4.9.6
  *
  * @see wp_privacy_exports_url
  *
  * @return string Exports directory.
  */
 function wp_privacy_exports_dir() {
 	$upload_dir  = wp_upload_dir();
 	$exports_dir = trailingslashit( $upload_dir['basedir'] ) . 'wp-personal-data-exports/';
 
 	/**
 	 * Filters the directory used to store personal data export files.
 	 *
 	 * @since 4.9.6
 	 * @since 5.5.0 Exports now use relative paths, so changes to the directory
 	 *              via this filter should be reflected on the server.
 	 *
 	 * @param string $exports_dir Exports directory.
 	 */
 	return apply_filters( 'wp_privacy_exports_dir', $exports_dir );
 }
 
 /**
  * Returns the URL of the directory used to store personal data export files.
  *
  * @since 4.9.6
  *
  * @see wp_privacy_exports_dir
  *
  * @return string Exports directory URL.
  */
 function wp_privacy_exports_url() {
 	$upload_dir  = wp_upload_dir();
 	$exports_url = trailingslashit( $upload_dir['baseurl'] ) . 'wp-personal-data-exports/';
 
 	/**
 	 * Filters the URL of the directory used to store personal data export files.
 	 *
 	 * @since 4.9.6
 	 * @since 5.5.0 Exports now use relative paths, so changes to the directory URL
 	 *              via this filter should be reflected on the server.
 	 *
 	 * @param string $exports_url Exports directory URL.
 	 */
 	return apply_filters( 'wp_privacy_exports_url', $exports_url );
 }
 
 /**
  * Schedule a `WP_Cron` job to delete expired export files.
  *
  * @since 4.9.6
  */
 function wp_schedule_delete_old_privacy_export_files() {
 	if ( wp_installing() ) {
 		return;
 	}
 
 	if ( ! wp_next_scheduled( 'wp_privacy_delete_old_export_files' ) ) {
 		wp_schedule_event( time(), 'hourly', 'wp_privacy_delete_old_export_files' );
 	}
 }
 
 /**
  * Cleans up export files older than three days old.
  *
  * The export files are stored in `wp-content/uploads`, and are therefore publicly
  * accessible. A CSPRN is appended to the filename to mitigate the risk of an
  * unauthorized person downloading the file, but it is still possible. Deleting
  * the file after the data subject has had a chance to delete it adds an additional
  * layer of protection.
  *
  * @since 4.9.6
  */
 function wp_privacy_delete_old_export_files() {
 	$exports_dir = wp_privacy_exports_dir();
 	if ( ! is_dir( $exports_dir ) ) {
 		return;
 	}
 
 	require_once ABSPATH . 'wp-admin/includes/file.php';
 	$export_files = list_files( $exports_dir, 100, array( 'index.php' ) );
 
 	/**
 	 * Filters the lifetime, in seconds, of a personal data export file.
 	 *
 	 * By default, the lifetime is 3 days. Once the file reaches that age, it will automatically
 	 * be deleted by a cron job.
 	 *
 	 * @since 4.9.6
 	 *
 	 * @param int $expiration The expiration age of the export, in seconds.
 	 */
 	$expiration = apply_filters( 'wp_privacy_export_expiration', 3 * DAY_IN_SECONDS );
 
 	foreach ( (array) $export_files as $export_file ) {
 		$file_age_in_seconds = time() - filemtime( $export_file );
 
 		if ( $expiration < $file_age_in_seconds ) {
 			unlink( $export_file );
 		}
 	}
 }
 
 /**
  * Gets the URL to learn more about updating the PHP version the site is running on.
  *
  * This URL can be overridden by specifying an environment variable `WP_UPDATE_PHP_URL` or by using the
  * {@see 'wp_update_php_url'} filter. Providing an empty string is not allowed and will result in the
  * default URL being used. Furthermore the page the URL links to should preferably be localized in the
  * site language.
  *
  * @since 5.1.0
  *
  * @return string URL to learn more about updating PHP.
  */
 function wp_get_update_php_url() {
 	$default_url = wp_get_default_update_php_url();
 
 	$update_url = $default_url;
 	if ( false !== getenv( 'WP_UPDATE_PHP_URL' ) ) {
 		$update_url = getenv( 'WP_UPDATE_PHP_URL' );
 	}
 
 	/**
 	 * Filters the URL to learn more about updating the PHP version the site is running on.
 	 *
 	 * Providing an empty string is not allowed and will result in the default URL being used. Furthermore
 	 * the page the URL links to should preferably be localized in the site language.
 	 *
 	 * @since 5.1.0
 	 *
 	 * @param string $update_url URL to learn more about updating PHP.
 	 */
 	$update_url = apply_filters( 'wp_update_php_url', $update_url );
 
 	if ( empty( $update_url ) ) {
 		$update_url = $default_url;
 	}
 
 	return $update_url;
 }
 
 /**
  * Gets the default URL to learn more about updating the PHP version the site is running on.
  *
  * Do not use this function to retrieve this URL. Instead, use {@see wp_get_update_php_url()} when relying on the URL.
  * This function does not allow modifying the returned URL, and is only used to compare the actually used URL with the
  * default one.
  *
  * @since 5.1.0
  * @access private
  *
  * @return string Default URL to learn more about updating PHP.
  */
 function wp_get_default_update_php_url() {
 	return _x( 'https://wordpress.org/support/update-php/', 'localized PHP upgrade information page' );
 }
 
 /**
  * Prints the default annotation for the web host altering the "Update PHP" page URL.
  *
  * This function is to be used after {@see wp_get_update_php_url()} to display a consistent
  * annotation if the web host has altered the default "Update PHP" page URL.
  *
  * @since 5.1.0
  * @since 5.2.0 Added the `$before` and `$after` parameters.
  *
  * @param string $before Markup to output before the annotation. Default `<p class="description">`.
  * @param string $after  Markup to output after the annotation. Default `</p>`.
  */
 function wp_update_php_annotation( $before = '<p class="description">', $after = '</p>' ) {
 	$annotation = wp_get_update_php_annotation();
 
 	if ( $annotation ) {
 		echo $before . $annotation . $after;
 	}
 }
 
 /**
  * Returns the default annotation for the web hosting altering the "Update PHP" page URL.
  *
  * This function is to be used after {@see wp_get_update_php_url()} to return a consistent
  * annotation if the web host has altered the default "Update PHP" page URL.
  *
  * @since 5.2.0
  *
  * @return string Update PHP page annotation. An empty string if no custom URLs are provided.
  */
 function wp_get_update_php_annotation() {
 	$update_url  = wp_get_update_php_url();
 	$default_url = wp_get_default_update_php_url();
 
 	if ( $update_url === $default_url ) {
 		return '';
 	}
 
 	$annotation = sprintf(
 		/* translators: %s: Default Update PHP page URL. */
 		__( 'This resource is provided by your web host, and is specific to your site. For more information, <a href="%s" target="_blank">see the official WordPress documentation</a>.' ),
 		esc_url( $default_url )
 	);
 
 	return $annotation;
 }
 
 /**
  * Gets the URL for directly updating the PHP version the site is running on.
  *
  * A URL will only be returned if the `WP_DIRECT_UPDATE_PHP_URL` environment variable is specified or
  * by using the {@see 'wp_direct_php_update_url'} filter. This allows hosts to send users directly to
  * the page where they can update PHP to a newer version.
  *
  * @since 5.1.1
  *
  * @return string URL for directly updating PHP or empty string.
  */
 function wp_get_direct_php_update_url() {
 	$direct_update_url = '';
 
 	if ( false !== getenv( 'WP_DIRECT_UPDATE_PHP_URL' ) ) {
 		$direct_update_url = getenv( 'WP_DIRECT_UPDATE_PHP_URL' );
 	}
 
 	/**
 	 * Filters the URL for directly updating the PHP version the site is running on from the host.
 	 *
 	 * @since 5.1.1
 	 *
 	 * @param string $direct_update_url URL for directly updating PHP.
 	 */
 	$direct_update_url = apply_filters( 'wp_direct_php_update_url', $direct_update_url );
 
 	return $direct_update_url;
 }
 
 /**
  * Display a button directly linking to a PHP update process.
  *
  * This provides hosts with a way for users to be sent directly to their PHP update process.
  *
  * The button is only displayed if a URL is returned by `wp_get_direct_php_update_url()`.
  *
  * @since 5.1.1
  */
 function wp_direct_php_update_button() {
 	$direct_update_url = wp_get_direct_php_update_url();
 
 	if ( empty( $direct_update_url ) ) {
 		return;
 	}
 
 	echo '<p class="button-container">';
 	printf(
 		'<a class="button button-primary" href="%1$s" target="_blank" rel="noopener">%2$s <span class="screen-reader-text">%3$s</span><span aria-hidden="true" class="dashicons dashicons-external"></span></a>',
 		esc_url( $direct_update_url ),
 		__( 'Update PHP' ),
 		/* translators: Accessibility text. */
 		__( '(opens in a new tab)' )
 	);
 	echo '</p>';
 }
 
 /**
  * Gets the URL to learn more about updating the site to use HTTPS.
  *
  * This URL can be overridden by specifying an environment variable `WP_UPDATE_HTTPS_URL` or by using the
  * {@see 'wp_update_https_url'} filter. Providing an empty string is not allowed and will result in the
  * default URL being used. Furthermore the page the URL links to should preferably be localized in the
  * site language.
  *
  * @since 5.7.0
  *
  * @return string URL to learn more about updating to HTTPS.
  */
 function wp_get_update_https_url() {
 	$default_url = wp_get_default_update_https_url();
 
 	$update_url = $default_url;
 	if ( false !== getenv( 'WP_UPDATE_HTTPS_URL' ) ) {
 		$update_url = getenv( 'WP_UPDATE_HTTPS_URL' );
 	}
 
 	/**
 	 * Filters the URL to learn more about updating the HTTPS version the site is running on.
 	 *
 	 * Providing an empty string is not allowed and will result in the default URL being used. Furthermore
 	 * the page the URL links to should preferably be localized in the site language.
 	 *
 	 * @since 5.7.0
 	 *
 	 * @param string $update_url URL to learn more about updating HTTPS.
 	 */
 	$update_url = apply_filters( 'wp_update_https_url', $update_url );
 	if ( empty( $update_url ) ) {
 		$update_url = $default_url;
 	}
 
 	return $update_url;
 }
 
 /**
  * Gets the default URL to learn more about updating the site to use HTTPS.
  *
  * Do not use this function to retrieve this URL. Instead, use {@see wp_get_update_https_url()} when relying on the URL.
  * This function does not allow modifying the returned URL, and is only used to compare the actually used URL with the
  * default one.
  *
  * @since 5.7.0
  * @access private
  *
  * @return string Default URL to learn more about updating to HTTPS.
  */
 function wp_get_default_update_https_url() {
 	/* translators: Documentation explaining HTTPS and why it should be used. */
 	return __( 'https://wordpress.org/support/article/why-should-i-use-https/' );
 }
 
 /**
  * Gets the URL for directly updating the site to use HTTPS.
  *
  * A URL will only be returned if the `WP_DIRECT_UPDATE_HTTPS_URL` environment variable is specified or
  * by using the {@see 'wp_direct_update_https_url'} filter. This allows hosts to send users directly to
  * the page where they can update their site to use HTTPS.
  *
  * @since 5.7.0
  *
  * @return string URL for directly updating to HTTPS or empty string.
  */
 function wp_get_direct_update_https_url() {
 	$direct_update_url = '';
 
 	if ( false !== getenv( 'WP_DIRECT_UPDATE_HTTPS_URL' ) ) {
 		$direct_update_url = getenv( 'WP_DIRECT_UPDATE_HTTPS_URL' );
 	}
 
 	/**
 	 * Filters the URL for directly updating the PHP version the site is running on from the host.
 	 *
 	 * @since 5.7.0
 	 *
 	 * @param string $direct_update_url URL for directly updating PHP.
 	 */
 	$direct_update_url = apply_filters( 'wp_direct_update_https_url', $direct_update_url );
 
 	return $direct_update_url;
 }
 
 /**
  * Get the size of a directory.
  *
  * A helper function that is used primarily to check whether
  * a blog has exceeded its allowed upload space.
  *
  * @since MU (3.0.0)
  * @since 5.2.0 $max_execution_time parameter added.
  *
  * @param string $directory Full path of a directory.
  * @param int    $max_execution_time Maximum time to run before giving up. In seconds.
  *                                   The timeout is global and is measured from the moment WordPress started to load.
  * @return int|false|null Size in bytes if a valid directory. False if not. Null if timeout.
  */
 function get_dirsize( $directory, $max_execution_time = null ) {
 
 	// Exclude individual site directories from the total when checking the main site of a network,
 	// as they are subdirectories and should not be counted.
 	if ( is_multisite() && is_main_site() ) {
 		$size = recurse_dirsize( $directory, $directory . '/sites', $max_execution_time );
 	} else {
 		$size = recurse_dirsize( $directory, null, $max_execution_time );
 	}
 
 	return $size;
 }
 
 /**
  * Get the size of a directory recursively.
  *
  * Used by get_dirsize() to get a directory size when it contains other directories.
  *
  * @since MU (3.0.0)
  * @since 4.3.0 The `$exclude` parameter was added.
  * @since 5.2.0 The `$max_execution_time` parameter was added.
  * @since 5.6.0 The `$directory_cache` parameter was added.
  *
  * @param string       $directory          Full path of a directory.
  * @param string|array $exclude            Optional. Full path of a subdirectory to exclude from the total,
  *                                         or array of paths. Expected without trailing slash(es).
  * @param int          $max_execution_time Maximum time to run before giving up. In seconds. The timeout is global
  *                                         and is measured from the moment WordPress started to load.
  * @param array        $directory_cache    Optional. Array of cached directory paths.
  *
  * @return int|false|null Size in bytes if a valid directory. False if not. Null if timeout.
  */
 function recurse_dirsize( $directory, $exclude = null, $max_execution_time = null, &$directory_cache = null ) {
 	$directory  = untrailingslashit( $directory );
 	$save_cache = false;
 
 	if ( ! isset( $directory_cache ) ) {
 		$directory_cache = get_transient( 'dirsize_cache' );
 		$save_cache      = true;
 	}
 
 	if ( isset( $directory_cache[ $directory ] ) && is_int( $directory_cache[ $directory ] ) ) {
 		return $directory_cache[ $directory ];
 	}
 
 	if ( ! file_exists( $directory ) || ! is_dir( $directory ) || ! is_readable( $directory ) ) {
 		return false;
 	}
 
 	if (
 		( is_string( $exclude ) && $directory === $exclude ) ||
 		( is_array( $exclude ) && in_array( $directory, $exclude, true ) )
 	) {
 		return false;
 	}
 
 	if ( null === $max_execution_time ) {
 		// Keep the previous behavior but attempt to prevent fatal errors from timeout if possible.
 		if ( function_exists( 'ini_get' ) ) {
 			$max_execution_time = ini_get( 'max_execution_time' );
 		} else {
 			// Disable...
 			$max_execution_time = 0;
 		}
 
 		// Leave 1 second "buffer" for other operations if $max_execution_time has reasonable value.
 		if ( $max_execution_time > 10 ) {
 			$max_execution_time -= 1;
 		}
 	}
 
 	/**
 	 * Filters the amount of storage space used by one directory and all its children, in megabytes.
 	 *
 	 * Return the actual used space to short-circuit the recursive PHP file size calculation
 	 * and use something else, like a CDN API or native operating system tools for better performance.
 	 *
 	 * @since 5.6.0
 	 *
 	 * @param int|false $space_used The amount of used space, in bytes. Default false.
 	 */
 	$size = apply_filters( 'pre_recurse_dirsize', false, $directory, $exclude, $max_execution_time, $directory_cache );
 
 	if ( false === $size ) {
 		$size = 0;
 
 		$handle = opendir( $directory );
 		if ( $handle ) {
 			while ( ( $file = readdir( $handle ) ) !== false ) {
 				$path = $directory . '/' . $file;
 				if ( '.' !== $file && '..' !== $file ) {
 					if ( is_file( $path ) ) {
 						$size += filesize( $path );
 					} elseif ( is_dir( $path ) ) {
 						$handlesize = recurse_dirsize( $path, $exclude, $max_execution_time, $directory_cache );
 						if ( $handlesize > 0 ) {
 							$size += $handlesize;
 						}
 					}
 
 					if ( $max_execution_time > 0 && microtime( true ) - WP_START_TIMESTAMP > $max_execution_time ) {
 						// Time exceeded. Give up instead of risking a fatal timeout.
 						$size = null;
 						break;
 					}
 				}
 			}
 			closedir( $handle );
 		}
 	}
 
 	$directory_cache[ $directory ] = $size;
 
 	// Only write the transient on the top level call and not on recursive calls.
 	if ( $save_cache ) {
 		set_transient( 'dirsize_cache', $directory_cache );
 	}
 
 	return $size;
 }
 
 /**
  * Cleans directory size cache used by recurse_dirsize().
  *
  * Removes the current directory and all parent directories from the `dirsize_cache` transient.
  *
  * @since 5.6.0
  *
  * @param string $path Full path of a directory or file.
  */
 function clean_dirsize_cache( $path ) {
 	$directory_cache = get_transient( 'dirsize_cache' );
 
 	if ( empty( $directory_cache ) ) {
 		return;
 	}
 
 	$path = untrailingslashit( $path );
 	unset( $directory_cache[ $path ] );
 
 	while ( DIRECTORY_SEPARATOR !== $path && '.' !== $path && '..' !== $path ) {
 		$path = dirname( $path );
 		unset( $directory_cache[ $path ] );
 	}
 
 	set_transient( 'dirsize_cache', $directory_cache );
 }
 
 /**
  * Checks compatibility with the current WordPress version.
  *
  * @since 5.2.0
  *
  * @param string $required Minimum required WordPress version.
  * @return bool True if required version is compatible or empty, false if not.
  */
 function is_wp_version_compatible( $required ) {
 	return empty( $required ) || version_compare( get_bloginfo( 'version' ), $required, '>=' );
 }
 
 /**
  * Checks compatibility with the current PHP version.
  *
  * @since 5.2.0
  *
  * @param string $required Minimum required PHP version.
  * @return bool True if required version is compatible or empty, false if not.
  */
 function is_php_version_compatible( $required ) {
 	return empty( $required ) || version_compare( phpversion(), $required, '>=' );
 }
 
 /**
  * Check if two numbers are nearly the same.
  *
  * This is similar to using `round()` but the precision is more fine-grained.
  *
  * @since 5.3.0
  *
  * @param int|float $expected  The expected value.
  * @param int|float $actual    The actual number.
  * @param int|float $precision The allowed variation.
  * @return bool Whether the numbers match whithin the specified precision.
  */
 function wp_fuzzy_number_match( $expected, $actual, $precision = 1 ) {
 	return abs( (float) $expected - (float) $actual ) <= $precision;
 }