ru-se.com

compat.php (12087B)

---

 <?php
 /**
  * WordPress implementation for PHP functions either missing from older PHP versions or not included by default.
  *
  * @package PHP
  * @access private
  */
 
 // If gettext isn't available.
 if ( ! function_exists( '_' ) ) {
 	function _( $string ) {
 		return $string;
 	}
 }
 
 /**
  * Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.
  *
  * @ignore
  * @since 4.2.2
  * @access private
  *
  * @param bool $set - Used for testing only
  *             null   : default - get PCRE/u capability
  *             false  : Used for testing - return false for future calls to this function
  *             'reset': Used for testing - restore default behavior of this function
  */
 function _wp_can_use_pcre_u( $set = null ) {
 	static $utf8_pcre = 'reset';
 
 	if ( null !== $set ) {
 		$utf8_pcre = $set;
 	}
 
 	if ( 'reset' === $utf8_pcre ) {
 		// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- intentional error generated to detect PCRE/u support.
 		$utf8_pcre = @preg_match( '/^./u', 'a' );
 	}
 
 	return $utf8_pcre;
 }
 
 if ( ! function_exists( 'mb_substr' ) ) :
 	/**
 	 * Compat function to mimic mb_substr().
 	 *
 	 * @ignore
 	 * @since 3.2.0
 	 *
 	 * @see _mb_substr()
 	 *
 	 * @param string      $str      The string to extract the substring from.
 	 * @param int         $start    Position to being extraction from in `$str`.
 	 * @param int|null    $length   Optional. Maximum number of characters to extract from `$str`.
 	 *                              Default null.
 	 * @param string|null $encoding Optional. Character encoding to use. Default null.
 	 * @return string Extracted substring.
 	 */
 	function mb_substr( $str, $start, $length = null, $encoding = null ) {
 		return _mb_substr( $str, $start, $length, $encoding );
 	}
 endif;
 
 /**
  * Internal compat function to mimic mb_substr().
  *
  * Only understands UTF-8 and 8bit.  All other character sets will be treated as 8bit.
  * For $encoding === UTF-8, the $str input is expected to be a valid UTF-8 byte sequence.
  * The behavior of this function for invalid inputs is undefined.
  *
  * @ignore
  * @since 3.2.0
  *
  * @param string      $str      The string to extract the substring from.
  * @param int         $start    Position to being extraction from in `$str`.
  * @param int|null    $length   Optional. Maximum number of characters to extract from `$str`.
  *                              Default null.
  * @param string|null $encoding Optional. Character encoding to use. Default null.
  * @return string Extracted substring.
  */
 function _mb_substr( $str, $start, $length = null, $encoding = null ) {
 	if ( null === $encoding ) {
 		$encoding = get_option( 'blog_charset' );
 	}
 
 	/*
 	 * The solution below works only for UTF-8, so in case of a different
 	 * charset just use built-in substr().
 	 */
 	if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ), true ) ) {
 		return is_null( $length ) ? substr( $str, $start ) : substr( $str, $start, $length );
 	}
 
 	if ( _wp_can_use_pcre_u() ) {
 		// Use the regex unicode support to separate the UTF-8 characters into an array.
 		preg_match_all( '/./us', $str, $match );
 		$chars = is_null( $length ) ? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
 		return implode( '', $chars );
 	}
 
 	$regex = '/(
 		[\x00-\x7F]                  # single-byte sequences   0xxxxxxx
 		| [\xC2-\xDF][\x80-\xBF]       # double-byte sequences   110xxxxx 10xxxxxx
 		| \xE0[\xA0-\xBF][\x80-\xBF]   # triple-byte sequences   1110xxxx 10xxxxxx * 2
 		| [\xE1-\xEC][\x80-\xBF]{2}
 		| \xED[\x80-\x9F][\x80-\xBF]
 		| [\xEE-\xEF][\x80-\xBF]{2}
 		| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences   11110xxx 10xxxxxx * 3
 		| [\xF1-\xF3][\x80-\xBF]{3}
 		| \xF4[\x80-\x8F][\x80-\xBF]{2}
 	)/x';
 
 	// Start with 1 element instead of 0 since the first thing we do is pop.
 	$chars = array( '' );
 	do {
 		// We had some string left over from the last round, but we counted it in that last round.
 		array_pop( $chars );
 
 		/*
 		 * Split by UTF-8 character, limit to 1000 characters (last array element will contain
 		 * the rest of the string).
 		 */
 		$pieces = preg_split( $regex, $str, 1000, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
 
 		$chars = array_merge( $chars, $pieces );
 
 		// If there's anything left over, repeat the loop.
 	} while ( count( $pieces ) > 1 && $str = array_pop( $pieces ) );
 
 	return implode( '', array_slice( $chars, $start, $length ) );
 }
 
 if ( ! function_exists( 'mb_strlen' ) ) :
 	/**
 	 * Compat function to mimic mb_strlen().
 	 *
 	 * @ignore
 	 * @since 4.2.0
 	 *
 	 * @see _mb_strlen()
 	 *
 	 * @param string      $str      The string to retrieve the character length from.
 	 * @param string|null $encoding Optional. Character encoding to use. Default null.
 	 * @return int String length of `$str`.
 	 */
 	function mb_strlen( $str, $encoding = null ) {
 		return _mb_strlen( $str, $encoding );
 	}
 endif;
 
 /**
  * Internal compat function to mimic mb_strlen().
  *
  * Only understands UTF-8 and 8bit.  All other character sets will be treated as 8bit.
  * For $encoding === UTF-8, the `$str` input is expected to be a valid UTF-8 byte
  * sequence. The behavior of this function for invalid inputs is undefined.
  *
  * @ignore
  * @since 4.2.0
  *
  * @param string      $str      The string to retrieve the character length from.
  * @param string|null $encoding Optional. Character encoding to use. Default null.
  * @return int String length of `$str`.
  */
 function _mb_strlen( $str, $encoding = null ) {
 	if ( null === $encoding ) {
 		$encoding = get_option( 'blog_charset' );
 	}
 
 	/*
 	 * The solution below works only for UTF-8, so in case of a different charset
 	 * just use built-in strlen().
 	 */
 	if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ), true ) ) {
 		return strlen( $str );
 	}
 
 	if ( _wp_can_use_pcre_u() ) {
 		// Use the regex unicode support to separate the UTF-8 characters into an array.
 		preg_match_all( '/./us', $str, $match );
 		return count( $match[0] );
 	}
 
 	$regex = '/(?:
 		[\x00-\x7F]                  # single-byte sequences   0xxxxxxx
 		| [\xC2-\xDF][\x80-\xBF]       # double-byte sequences   110xxxxx 10xxxxxx
 		| \xE0[\xA0-\xBF][\x80-\xBF]   # triple-byte sequences   1110xxxx 10xxxxxx * 2
 		| [\xE1-\xEC][\x80-\xBF]{2}
 		| \xED[\x80-\x9F][\x80-\xBF]
 		| [\xEE-\xEF][\x80-\xBF]{2}
 		| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences   11110xxx 10xxxxxx * 3
 		| [\xF1-\xF3][\x80-\xBF]{3}
 		| \xF4[\x80-\x8F][\x80-\xBF]{2}
 	)/x';
 
 	// Start at 1 instead of 0 since the first thing we do is decrement.
 	$count = 1;
 	do {
 		// We had some string left over from the last round, but we counted it in that last round.
 		$count--;
 
 		/*
 		 * Split by UTF-8 character, limit to 1000 characters (last array element will contain
 		 * the rest of the string).
 		 */
 		$pieces = preg_split( $regex, $str, 1000 );
 
 		// Increment.
 		$count += count( $pieces );
 
 		// If there's anything left over, repeat the loop.
 	} while ( $str = array_pop( $pieces ) );
 
 	// Fencepost: preg_split() always returns one extra item in the array.
 	return --$count;
 }
 
 if ( ! function_exists( 'hash_hmac' ) ) :
 	/**
 	 * Compat function to mimic hash_hmac().
 	 *
 	 * The Hash extension is bundled with PHP by default since PHP 5.1.2.
 	 * However, the extension may be explicitly disabled on select servers.
 	 * As of PHP 7.4.0, the Hash extension is a core PHP extension and can no
 	 * longer be disabled.
 	 * I.e. when PHP 7.4.0 becomes the minimum requirement, this polyfill
 	 * and the associated `_hash_hmac()` function can be safely removed.
 	 *
 	 * @ignore
 	 * @since 3.2.0
 	 *
 	 * @see _hash_hmac()
 	 *
 	 * @param string $algo       Hash algorithm. Accepts 'md5' or 'sha1'.
 	 * @param string $data       Data to be hashed.
 	 * @param string $key        Secret key to use for generating the hash.
 	 * @param bool   $raw_output Optional. Whether to output raw binary data (true),
 	 *                           or lowercase hexits (false). Default false.
 	 * @return string|false The hash in output determined by `$raw_output`. False if `$algo`
 	 *                      is unknown or invalid.
 	 */
 	function hash_hmac( $algo, $data, $key, $raw_output = false ) {
 		return _hash_hmac( $algo, $data, $key, $raw_output );
 	}
 endif;
 
 /**
  * Internal compat function to mimic hash_hmac().
  *
  * @ignore
  * @since 3.2.0
  *
  * @param string $algo       Hash algorithm. Accepts 'md5' or 'sha1'.
  * @param string $data       Data to be hashed.
  * @param string $key        Secret key to use for generating the hash.
  * @param bool   $raw_output Optional. Whether to output raw binary data (true),
  *                           or lowercase hexits (false). Default false.
  * @return string|false The hash in output determined by `$raw_output`. False if `$algo`
  *                      is unknown or invalid.
  */
 function _hash_hmac( $algo, $data, $key, $raw_output = false ) {
 	$packs = array(
 		'md5'  => 'H32',
 		'sha1' => 'H40',
 	);
 
 	if ( ! isset( $packs[ $algo ] ) ) {
 		return false;
 	}
 
 	$pack = $packs[ $algo ];
 
 	if ( strlen( $key ) > 64 ) {
 		$key = pack( $pack, $algo( $key ) );
 	}
 
 	$key = str_pad( $key, 64, chr( 0 ) );
 
 	$ipad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x36 ), 64 ) );
 	$opad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x5C ), 64 ) );
 
 	$hmac = $algo( $opad . pack( $pack, $algo( $ipad . $data ) ) );
 
 	if ( $raw_output ) {
 		return pack( $pack, $hmac );
 	}
 	return $hmac;
 }
 
 if ( ! function_exists( 'hash_equals' ) ) :
 	/**
 	 * Timing attack safe string comparison
 	 *
 	 * Compares two strings using the same time whether they're equal or not.
 	 *
 	 * Note: It can leak the length of a string when arguments of differing length are supplied.
 	 *
 	 * This function was added in PHP 5.6.
 	 * However, the Hash extension may be explicitly disabled on select servers.
 	 * As of PHP 7.4.0, the Hash extension is a core PHP extension and can no
 	 * longer be disabled.
 	 * I.e. when PHP 7.4.0 becomes the minimum requirement, this polyfill
 	 * can be safely removed.
 	 *
 	 * @since 3.9.2
 	 *
 	 * @param string $a Expected string.
 	 * @param string $b Actual, user supplied, string.
 	 * @return bool Whether strings are equal.
 	 */
 	function hash_equals( $a, $b ) {
 		$a_length = strlen( $a );
 		if ( strlen( $b ) !== $a_length ) {
 			return false;
 		}
 		$result = 0;
 
 		// Do not attempt to "optimize" this.
 		for ( $i = 0; $i < $a_length; $i++ ) {
 			$result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] );
 		}
 
 		return 0 === $result;
 	}
 endif;
 
 // random_int() was introduced in PHP 7.0.
 if ( ! function_exists( 'random_int' ) ) {
 	require ABSPATH . WPINC . '/random_compat/random.php';
 }
 // sodium_crypto_box() was introduced in PHP 7.2.
 if ( ! function_exists( 'sodium_crypto_box' ) ) {
 	require ABSPATH . WPINC . '/sodium_compat/autoload.php';
 }
 
 if ( ! function_exists( 'is_countable' ) ) {
 	/**
 	 * Polyfill for is_countable() function added in PHP 7.3.
 	 *
 	 * Verify that the content of a variable is an array or an object
 	 * implementing the Countable interface.
 	 *
 	 * @since 4.9.6
 	 *
 	 * @param mixed $var The value to check.
 	 * @return bool True if `$var` is countable, false otherwise.
 	 */
 	function is_countable( $var ) {
 		return ( is_array( $var )
 			|| $var instanceof Countable
 			|| $var instanceof SimpleXMLElement
 			|| $var instanceof ResourceBundle
 		);
 	}
 }
 
 if ( ! function_exists( 'is_iterable' ) ) {
 	/**
 	 * Polyfill for is_iterable() function added in PHP 7.1.
 	 *
 	 * Verify that the content of a variable is an array or an object
 	 * implementing the Traversable interface.
 	 *
 	 * @since 4.9.6
 	 *
 	 * @param mixed $var The value to check.
 	 * @return bool True if `$var` is iterable, false otherwise.
 	 */
 	function is_iterable( $var ) {
 		return ( is_array( $var ) || $var instanceof Traversable );
 	}
 }
 
 // IMAGETYPE_WEBP constant is only defined in PHP 7.1 or later.
 if ( ! defined( 'IMAGETYPE_WEBP' ) ) {
 	define( 'IMAGETYPE_WEBP', 18 );
 }
 
 // IMG_WEBP constant is only defined in PHP 7.0.10 or later.
 if ( ! defined( 'IMG_WEBP' ) ) {
 	define( 'IMG_WEBP', IMAGETYPE_WEBP ); // phpcs:ignore PHPCompatibility.Constants.NewConstants.imagetype_webpFound
 }