balmet.com

pluggable.php (103920B)

---

 <?php
 /**
  * These functions can be replaced via plugins. If plugins do not redefine these
  * functions, then these will be used instead.
  *
  * @package WordPress
  */
 
 if ( ! function_exists( 'wp_set_current_user' ) ) :
 	/**
 	 * Changes the current user by ID or name.
 	 *
 	 * Set $id to null and specify a name if you do not know a user's ID.
 	 *
 	 * Some WordPress functionality is based on the current user and not based on
 	 * the signed in user. Therefore, it opens the ability to edit and perform
 	 * actions on users who aren't signed in.
 	 *
 	 * @since 2.0.3
 	 *
 	 * @global WP_User $current_user The current user object which holds the user data.
 	 *
 	 * @param int    $id   User ID
 	 * @param string $name User's username
 	 * @return WP_User Current user User object
 	 */
 	function wp_set_current_user( $id, $name = '' ) {
 		global $current_user;
 
 		// If `$id` matches the current user, there is nothing to do.
 		if ( isset( $current_user )
 		&& ( $current_user instanceof WP_User )
 		&& ( $id == $current_user->ID )
 		&& ( null !== $id )
 		) {
 			return $current_user;
 		}
 
 		$current_user = new WP_User( $id, $name );
 
 		setup_userdata( $current_user->ID );
 
 		/**
 		 * Fires after the current user is set.
 		 *
 		 * @since 2.0.1
 		 */
 		do_action( 'set_current_user' );
 
 		return $current_user;
 	}
 endif;
 
 if ( ! function_exists( 'wp_get_current_user' ) ) :
 	/**
 	 * Retrieve the current user object.
 	 *
 	 * Will set the current user, if the current user is not set. The current user
 	 * will be set to the logged-in person. If no user is logged-in, then it will
 	 * set the current user to 0, which is invalid and won't have any permissions.
 	 *
 	 * @since 2.0.3
 	 *
 	 * @see _wp_get_current_user()
 	 * @global WP_User $current_user Checks if the current user is set.
 	 *
 	 * @return WP_User Current WP_User instance.
 	 */
 	function wp_get_current_user() {
 		return _wp_get_current_user();
 	}
 endif;
 
 if ( ! function_exists( 'get_userdata' ) ) :
 	/**
 	 * Retrieve user info by user ID.
 	 *
 	 * @since 0.71
 	 *
 	 * @param int $user_id User ID
 	 * @return WP_User|false WP_User object on success, false on failure.
 	 */
 	function get_userdata( $user_id ) {
 		return get_user_by( 'id', $user_id );
 	}
 endif;
 
 if ( ! function_exists( 'get_user_by' ) ) :
 	/**
 	 * Retrieve user info by a given field
 	 *
 	 * @since 2.8.0
 	 * @since 4.4.0 Added 'ID' as an alias of 'id' for the `$field` parameter.
 	 * @since 5.8.0 Returns the global `$current_user` if it's the user being fetched.
 	 *
 	 * @global WP_User $current_user The current user object which holds the user data.
 	 *
 	 * @param string     $field The field to retrieve the user with. id | ID | slug | email | login.
 	 * @param int|string $value A value for $field. A user ID, slug, email address, or login name.
 	 * @return WP_User|false WP_User object on success, false on failure.
 	 */
 	function get_user_by( $field, $value ) {
 		global $current_user;
 
 		$userdata = WP_User::get_data_by( $field, $value );
 
 		if ( ! $userdata ) {
 			return false;
 		}
 
 		if ( $current_user instanceof WP_User && $current_user->ID === (int) $userdata->ID ) {
 			return $current_user;
 		}
 
 		$user = new WP_User;
 		$user->init( $userdata );
 
 		return $user;
 	}
 endif;
 
 if ( ! function_exists( 'cache_users' ) ) :
 	/**
 	 * Retrieve info for user lists to prevent multiple queries by get_userdata()
 	 *
 	 * @since 3.0.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
 	 * @param array $user_ids User ID numbers list
 	 */
 	function cache_users( $user_ids ) {
 		global $wpdb;
 
 		$clean = _get_non_cached_ids( $user_ids, 'users' );
 
 		if ( empty( $clean ) ) {
 			return;
 		}
 
 		$list = implode( ',', $clean );
 
 		$users = $wpdb->get_results( "SELECT * FROM $wpdb->users WHERE ID IN ($list)" );
 
 		$ids = array();
 		foreach ( $users as $user ) {
 			update_user_caches( $user );
 			$ids[] = $user->ID;
 		}
 		update_meta_cache( 'user', $ids );
 	}
 endif;
 
 if ( ! function_exists( 'wp_mail' ) ) :
 	/**
 	 * Sends an email, similar to PHP's mail function.
 	 *
 	 * A true return value does not automatically mean that the user received the
 	 * email successfully. It just only means that the method used was able to
 	 * process the request without any errors.
 	 *
 	 * The default content type is `text/plain` which does not allow using HTML.
 	 * However, you can set the content type of the email by using the
 	 * {@see 'wp_mail_content_type'} filter.
 	 *
 	 * The default charset is based on the charset used on the blog. The charset can
 	 * be set using the {@see 'wp_mail_charset'} filter.
 	 *
 	 * @since 1.2.1
 	 * @since 5.5.0 is_email() is used for email validation,
 	 *              instead of PHPMailer's default validator.
 	 *
 	 * @global PHPMailer\PHPMailer\PHPMailer $phpmailer
 	 *
 	 * @param string|string[] $to          Array or comma-separated list of email addresses to send message.
 	 * @param string          $subject     Email subject.
 	 * @param string          $message     Message contents.
 	 * @param string|string[] $headers     Optional. Additional headers.
 	 * @param string|string[] $attachments Optional. Paths to files to attach.
 	 * @return bool Whether the email was sent successfully.
 	 */
 	function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) {
 		// Compact the input, apply the filters, and extract them back out.
 
 		/**
 		 * Filters the wp_mail() arguments.
 		 *
 		 * @since 2.2.0
 		 *
 		 * @param array $args {
 		 *     Array of the `wp_mail()` arguments.
 		 *
 		 *     @type string|string[] $to          Array or comma-separated list of email addresses to send message.
 		 *     @type string          $subject     Email subject.
 		 *     @type string          $message     Message contents.
 		 *     @type string|string[] $headers     Additional headers.
 		 *     @type string|string[] $attachments Paths to files to attach.
 		 * }
 		 */
 		$atts = apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) );
 
 		/**
 		 * Filters whether to preempt sending an email.
 		 *
 		 * Returning a non-null value will short-circuit {@see wp_mail()}, returning
 		 * that value instead. A boolean return value should be used to indicate whether
 		 * the email was successfully sent.
 		 *
 		 * @since 5.7.0
 		 *
 		 * @param null|bool $return Short-circuit return value.
 		 * @param array     $atts {
 		 *     Array of the `wp_mail()` arguments.
 		 *
 		 *     @type string|string[] $to          Array or comma-separated list of email addresses to send message.
 		 *     @type string          $subject     Email subject.
 		 *     @type string          $message     Message contents.
 		 *     @type string|string[] $headers     Additional headers.
 		 *     @type string|string[] $attachments Paths to files to attach.
 		 * }
 		 */
 		$pre_wp_mail = apply_filters( 'pre_wp_mail', null, $atts );
 
 		if ( null !== $pre_wp_mail ) {
 			return $pre_wp_mail;
 		}
 
 		if ( isset( $atts['to'] ) ) {
 			$to = $atts['to'];
 		}
 
 		if ( ! is_array( $to ) ) {
 			$to = explode( ',', $to );
 		}
 
 		if ( isset( $atts['subject'] ) ) {
 			$subject = $atts['subject'];
 		}
 
 		if ( isset( $atts['message'] ) ) {
 			$message = $atts['message'];
 		}
 
 		if ( isset( $atts['headers'] ) ) {
 			$headers = $atts['headers'];
 		}
 
 		if ( isset( $atts['attachments'] ) ) {
 			$attachments = $atts['attachments'];
 		}
 
 		if ( ! is_array( $attachments ) ) {
 			$attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) );
 		}
 		global $phpmailer;
 
 		// (Re)create it, if it's gone missing.
 		if ( ! ( $phpmailer instanceof PHPMailer\PHPMailer\PHPMailer ) ) {
 			require_once ABSPATH . WPINC . '/PHPMailer/PHPMailer.php';
 			require_once ABSPATH . WPINC . '/PHPMailer/SMTP.php';
 			require_once ABSPATH . WPINC . '/PHPMailer/Exception.php';
 			$phpmailer = new PHPMailer\PHPMailer\PHPMailer( true );
 
 			$phpmailer::$validator = static function ( $email ) {
 				return (bool) is_email( $email );
 			};
 		}
 
 		// Headers.
 		$cc       = array();
 		$bcc      = array();
 		$reply_to = array();
 
 		if ( empty( $headers ) ) {
 			$headers = array();
 		} else {
 			if ( ! is_array( $headers ) ) {
 				// Explode the headers out, so this function can take
 				// both string headers and an array of headers.
 				$tempheaders = explode( "\n", str_replace( "\r\n", "\n", $headers ) );
 			} else {
 				$tempheaders = $headers;
 			}
 			$headers = array();
 
 			// If it's actually got contents.
 			if ( ! empty( $tempheaders ) ) {
 				// Iterate through the raw headers.
 				foreach ( (array) $tempheaders as $header ) {
 					if ( strpos( $header, ':' ) === false ) {
 						if ( false !== stripos( $header, 'boundary=' ) ) {
 							$parts    = preg_split( '/boundary=/i', trim( $header ) );
 							$boundary = trim( str_replace( array( "'", '"' ), '', $parts[1] ) );
 						}
 						continue;
 					}
 					// Explode them out.
 					list( $name, $content ) = explode( ':', trim( $header ), 2 );
 
 					// Cleanup crew.
 					$name    = trim( $name );
 					$content = trim( $content );
 
 					switch ( strtolower( $name ) ) {
 						// Mainly for legacy -- process a "From:" header if it's there.
 						case 'from':
 							$bracket_pos = strpos( $content, '<' );
 							if ( false !== $bracket_pos ) {
 								// Text before the bracketed email is the "From" name.
 								if ( $bracket_pos > 0 ) {
 									$from_name = substr( $content, 0, $bracket_pos - 1 );
 									$from_name = str_replace( '"', '', $from_name );
 									$from_name = trim( $from_name );
 								}
 
 								$from_email = substr( $content, $bracket_pos + 1 );
 								$from_email = str_replace( '>', '', $from_email );
 								$from_email = trim( $from_email );
 
 								// Avoid setting an empty $from_email.
 							} elseif ( '' !== trim( $content ) ) {
 								$from_email = trim( $content );
 							}
 							break;
 						case 'content-type':
 							if ( strpos( $content, ';' ) !== false ) {
 								list( $type, $charset_content ) = explode( ';', $content );
 								$content_type                   = trim( $type );
 								if ( false !== stripos( $charset_content, 'charset=' ) ) {
 									$charset = trim( str_replace( array( 'charset=', '"' ), '', $charset_content ) );
 								} elseif ( false !== stripos( $charset_content, 'boundary=' ) ) {
 									$boundary = trim( str_replace( array( 'BOUNDARY=', 'boundary=', '"' ), '', $charset_content ) );
 									$charset  = '';
 								}
 
 								// Avoid setting an empty $content_type.
 							} elseif ( '' !== trim( $content ) ) {
 								$content_type = trim( $content );
 							}
 							break;
 						case 'cc':
 							$cc = array_merge( (array) $cc, explode( ',', $content ) );
 							break;
 						case 'bcc':
 							$bcc = array_merge( (array) $bcc, explode( ',', $content ) );
 							break;
 						case 'reply-to':
 							$reply_to = array_merge( (array) $reply_to, explode( ',', $content ) );
 							break;
 						default:
 							// Add it to our grand headers array.
 							$headers[ trim( $name ) ] = trim( $content );
 							break;
 					}
 				}
 			}
 		}
 
 		// Empty out the values that may be set.
 		$phpmailer->clearAllRecipients();
 		$phpmailer->clearAttachments();
 		$phpmailer->clearCustomHeaders();
 		$phpmailer->clearReplyTos();
 
 		// Set "From" name and email.
 
 		// If we don't have a name from the input headers.
 		if ( ! isset( $from_name ) ) {
 			$from_name = 'WordPress';
 		}
 
 		/*
 		 * If we don't have an email from the input headers, default to wordpress@$sitename
 		 * Some hosts will block outgoing mail from this address if it doesn't exist,
 		 * but there's no easy alternative. Defaulting to admin_email might appear to be
 		 * another option, but some hosts may refuse to relay mail from an unknown domain.
 		 * See https://core.trac.wordpress.org/ticket/5007.
 		 */
 		if ( ! isset( $from_email ) ) {
 			// Get the site domain and get rid of www.
 			$sitename = wp_parse_url( network_home_url(), PHP_URL_HOST );
 			if ( 'www.' === substr( $sitename, 0, 4 ) ) {
 				$sitename = substr( $sitename, 4 );
 			}
 
 			$from_email = 'wordpress@' . $sitename;
 		}
 
 		/**
 		 * Filters the email address to send from.
 		 *
 		 * @since 2.2.0
 		 *
 		 * @param string $from_email Email address to send from.
 		 */
 		$from_email = apply_filters( 'wp_mail_from', $from_email );
 
 		/**
 		 * Filters the name to associate with the "from" email address.
 		 *
 		 * @since 2.3.0
 		 *
 		 * @param string $from_name Name associated with the "from" email address.
 		 */
 		$from_name = apply_filters( 'wp_mail_from_name', $from_name );
 
 		try {
 			$phpmailer->setFrom( $from_email, $from_name, false );
 		} catch ( PHPMailer\PHPMailer\Exception $e ) {
 			$mail_error_data                             = compact( 'to', 'subject', 'message', 'headers', 'attachments' );
 			$mail_error_data['phpmailer_exception_code'] = $e->getCode();
 
 			/** This filter is documented in wp-includes/pluggable.php */
 			do_action( 'wp_mail_failed', new WP_Error( 'wp_mail_failed', $e->getMessage(), $mail_error_data ) );
 
 			return false;
 		}
 
 		// Set mail's subject and body.
 		$phpmailer->Subject = $subject;
 		$phpmailer->Body    = $message;
 
 		// Set destination addresses, using appropriate methods for handling addresses.
 		$address_headers = compact( 'to', 'cc', 'bcc', 'reply_to' );
 
 		foreach ( $address_headers as $address_header => $addresses ) {
 			if ( empty( $addresses ) ) {
 				continue;
 			}
 
 			foreach ( (array) $addresses as $address ) {
 				try {
 					// Break $recipient into name and address parts if in the format "Foo <bar@baz.com>".
 					$recipient_name = '';
 
 					if ( preg_match( '/(.*)<(.+)>/', $address, $matches ) ) {
 						if ( count( $matches ) == 3 ) {
 							$recipient_name = $matches[1];
 							$address        = $matches[2];
 						}
 					}
 
 					switch ( $address_header ) {
 						case 'to':
 							$phpmailer->addAddress( $address, $recipient_name );
 							break;
 						case 'cc':
 							$phpmailer->addCc( $address, $recipient_name );
 							break;
 						case 'bcc':
 							$phpmailer->addBcc( $address, $recipient_name );
 							break;
 						case 'reply_to':
 							$phpmailer->addReplyTo( $address, $recipient_name );
 							break;
 					}
 				} catch ( PHPMailer\PHPMailer\Exception $e ) {
 					continue;
 				}
 			}
 		}
 
 		// Set to use PHP's mail().
 		$phpmailer->isMail();
 
 		// Set Content-Type and charset.
 
 		// If we don't have a content-type from the input headers.
 		if ( ! isset( $content_type ) ) {
 			$content_type = 'text/plain';
 		}
 
 		/**
 		 * Filters the wp_mail() content type.
 		 *
 		 * @since 2.3.0
 		 *
 		 * @param string $content_type Default wp_mail() content type.
 		 */
 		$content_type = apply_filters( 'wp_mail_content_type', $content_type );
 
 		$phpmailer->ContentType = $content_type;
 
 		// Set whether it's plaintext, depending on $content_type.
 		if ( 'text/html' === $content_type ) {
 			$phpmailer->isHTML( true );
 		}
 
 		// If we don't have a charset from the input headers.
 		if ( ! isset( $charset ) ) {
 			$charset = get_bloginfo( 'charset' );
 		}
 
 		/**
 		 * Filters the default wp_mail() charset.
 		 *
 		 * @since 2.3.0
 		 *
 		 * @param string $charset Default email charset.
 		 */
 		$phpmailer->CharSet = apply_filters( 'wp_mail_charset', $charset );
 
 		// Set custom headers.
 		if ( ! empty( $headers ) ) {
 			foreach ( (array) $headers as $name => $content ) {
 				// Only add custom headers not added automatically by PHPMailer.
 				if ( ! in_array( $name, array( 'MIME-Version', 'X-Mailer' ), true ) ) {
 					try {
 						$phpmailer->addCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) );
 					} catch ( PHPMailer\PHPMailer\Exception $e ) {
 						continue;
 					}
 				}
 			}
 
 			if ( false !== stripos( $content_type, 'multipart' ) && ! empty( $boundary ) ) {
 				$phpmailer->addCustomHeader( sprintf( 'Content-Type: %s; boundary="%s"', $content_type, $boundary ) );
 			}
 		}
 
 		if ( ! empty( $attachments ) ) {
 			foreach ( $attachments as $attachment ) {
 				try {
 					$phpmailer->addAttachment( $attachment );
 				} catch ( PHPMailer\PHPMailer\Exception $e ) {
 					continue;
 				}
 			}
 		}
 
 		/**
 		 * Fires after PHPMailer is initialized.
 		 *
 		 * @since 2.2.0
 		 *
 		 * @param PHPMailer $phpmailer The PHPMailer instance (passed by reference).
 		 */
 		do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) );
 
 		// Send!
 		try {
 			return $phpmailer->send();
 		} catch ( PHPMailer\PHPMailer\Exception $e ) {
 
 			$mail_error_data                             = compact( 'to', 'subject', 'message', 'headers', 'attachments' );
 			$mail_error_data['phpmailer_exception_code'] = $e->getCode();
 
 			/**
 			 * Fires after a PHPMailer\PHPMailer\Exception is caught.
 			 *
 			 * @since 4.4.0
 			 *
 			 * @param WP_Error $error A WP_Error object with the PHPMailer\PHPMailer\Exception message, and an array
 			 *                        containing the mail recipient, subject, message, headers, and attachments.
 			 */
 			do_action( 'wp_mail_failed', new WP_Error( 'wp_mail_failed', $e->getMessage(), $mail_error_data ) );
 
 			return false;
 		}
 	}
 endif;
 
 if ( ! function_exists( 'wp_authenticate' ) ) :
 	/**
 	 * Authenticate a user, confirming the login credentials are valid.
 	 *
 	 * @since 2.5.0
 	 * @since 4.5.0 `$username` now accepts an email address.
 	 *
 	 * @param string $username User's username or email address.
 	 * @param string $password User's password.
 	 * @return WP_User|WP_Error WP_User object if the credentials are valid,
 	 *                          otherwise WP_Error.
 	 */
 	function wp_authenticate( $username, $password ) {
 		$username = sanitize_user( $username );
 		$password = trim( $password );
 
 		/**
 		 * Filters whether a set of user login credentials are valid.
 		 *
 		 * A WP_User object is returned if the credentials authenticate a user.
 		 * WP_Error or null otherwise.
 		 *
 		 * @since 2.8.0
 		 * @since 4.5.0 `$username` now accepts an email address.
 		 *
 		 * @param null|WP_User|WP_Error $user     WP_User if the user is authenticated.
 		 *                                        WP_Error or null otherwise.
 		 * @param string                $username Username or email address.
 		 * @param string                $password User password
 		 */
 		$user = apply_filters( 'authenticate', null, $username, $password );
 
 		if ( null == $user ) {
 			// TODO: What should the error message be? (Or would these even happen?)
 			// Only needed if all authentication handlers fail to return anything.
 			$user = new WP_Error( 'authentication_failed', __( '<strong>Error</strong>: Invalid username, email address or incorrect password.' ) );
 		}
 
 		$ignore_codes = array( 'empty_username', 'empty_password' );
 
 		if ( is_wp_error( $user ) && ! in_array( $user->get_error_code(), $ignore_codes, true ) ) {
 			$error = $user;
 
 			/**
 			 * Fires after a user login has failed.
 			 *
 			 * @since 2.5.0
 			 * @since 4.5.0 The value of `$username` can now be an email address.
 			 * @since 5.4.0 The `$error` parameter was added.
 			 *
 			 * @param string   $username Username or email address.
 			 * @param WP_Error $error    A WP_Error object with the authentication failure details.
 			 */
 			do_action( 'wp_login_failed', $username, $error );
 		}
 
 		return $user;
 	}
 endif;
 
 if ( ! function_exists( 'wp_logout' ) ) :
 	/**
 	 * Log the current user out.
 	 *
 	 * @since 2.5.0
 	 */
 	function wp_logout() {
 		$user_id = get_current_user_id();
 
 		wp_destroy_current_session();
 		wp_clear_auth_cookie();
 		wp_set_current_user( 0 );
 
 		/**
 		 * Fires after a user is logged out.
 		 *
 		 * @since 1.5.0
 		 * @since 5.5.0 Added the `$user_id` parameter.
 		 *
 		 * @param int $user_id ID of the user that was logged out.
 		 */
 		do_action( 'wp_logout', $user_id );
 	}
 endif;
 
 if ( ! function_exists( 'wp_validate_auth_cookie' ) ) :
 	/**
 	 * Validates authentication cookie.
 	 *
 	 * The checks include making sure that the authentication cookie is set and
 	 * pulling in the contents (if $cookie is not used).
 	 *
 	 * Makes sure the cookie is not expired. Verifies the hash in cookie is what is
 	 * should be and compares the two.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @global int $login_grace_period
 	 *
 	 * @param string $cookie Optional. If used, will validate contents instead of cookie's.
 	 * @param string $scheme Optional. The cookie scheme to use: 'auth', 'secure_auth', or 'logged_in'.
 	 * @return int|false User ID if valid cookie, false if invalid.
 	 */
 	function wp_validate_auth_cookie( $cookie = '', $scheme = '' ) {
 		$cookie_elements = wp_parse_auth_cookie( $cookie, $scheme );
 		if ( ! $cookie_elements ) {
 			/**
 			 * Fires if an authentication cookie is malformed.
 			 *
 			 * @since 2.7.0
 			 *
 			 * @param string $cookie Malformed auth cookie.
 			 * @param string $scheme Authentication scheme. Values include 'auth', 'secure_auth',
 			 *                       or 'logged_in'.
 			 */
 			do_action( 'auth_cookie_malformed', $cookie, $scheme );
 			return false;
 		}
 
 		$scheme     = $cookie_elements['scheme'];
 		$username   = $cookie_elements['username'];
 		$hmac       = $cookie_elements['hmac'];
 		$token      = $cookie_elements['token'];
 		$expired    = $cookie_elements['expiration'];
 		$expiration = $cookie_elements['expiration'];
 
 		// Allow a grace period for POST and Ajax requests.
 		if ( wp_doing_ajax() || 'POST' === $_SERVER['REQUEST_METHOD'] ) {
 			$expired += HOUR_IN_SECONDS;
 		}
 
 		// Quick check to see if an honest cookie has expired.
 		if ( $expired < time() ) {
 			/**
 			 * Fires once an authentication cookie has expired.
 			 *
 			 * @since 2.7.0
 			 *
 			 * @param string[] $cookie_elements An array of data for the authentication cookie.
 			 */
 			do_action( 'auth_cookie_expired', $cookie_elements );
 			return false;
 		}
 
 		$user = get_user_by( 'login', $username );
 		if ( ! $user ) {
 			/**
 			 * Fires if a bad username is entered in the user authentication process.
 			 *
 			 * @since 2.7.0
 			 *
 			 * @param string[] $cookie_elements An array of data for the authentication cookie.
 			 */
 			do_action( 'auth_cookie_bad_username', $cookie_elements );
 			return false;
 		}
 
 		$pass_frag = substr( $user->user_pass, 8, 4 );
 
 		$key = wp_hash( $username . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme );
 
 		// If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
 		$algo = function_exists( 'hash' ) ? 'sha256' : 'sha1';
 		$hash = hash_hmac( $algo, $username . '|' . $expiration . '|' . $token, $key );
 
 		if ( ! hash_equals( $hash, $hmac ) ) {
 			/**
 			 * Fires if a bad authentication cookie hash is encountered.
 			 *
 			 * @since 2.7.0
 			 *
 			 * @param string[] $cookie_elements An array of data for the authentication cookie.
 			 */
 			do_action( 'auth_cookie_bad_hash', $cookie_elements );
 			return false;
 		}
 
 		$manager = WP_Session_Tokens::get_instance( $user->ID );
 		if ( ! $manager->verify( $token ) ) {
 			/**
 			 * Fires if a bad session token is encountered.
 			 *
 			 * @since 4.0.0
 			 *
 			 * @param string[] $cookie_elements An array of data for the authentication cookie.
 			 */
 			do_action( 'auth_cookie_bad_session_token', $cookie_elements );
 			return false;
 		}
 
 		// Ajax/POST grace period set above.
 		if ( $expiration < time() ) {
 			$GLOBALS['login_grace_period'] = 1;
 		}
 
 		/**
 		 * Fires once an authentication cookie has been validated.
 		 *
 		 * @since 2.7.0
 		 *
 		 * @param string[] $cookie_elements An array of data for the authentication cookie.
 		 * @param WP_User  $user            User object.
 		 */
 		do_action( 'auth_cookie_valid', $cookie_elements, $user );
 
 		return $user->ID;
 	}
 endif;
 
 if ( ! function_exists( 'wp_generate_auth_cookie' ) ) :
 	/**
 	 * Generates authentication cookie contents.
 	 *
 	 * @since 2.5.0
 	 * @since 4.0.0 The `$token` parameter was added.
 	 *
 	 * @param int    $user_id    User ID.
 	 * @param int    $expiration The time the cookie expires as a UNIX timestamp.
 	 * @param string $scheme     Optional. The cookie scheme to use: 'auth', 'secure_auth', or 'logged_in'.
 	 *                           Default 'auth'.
 	 * @param string $token      User's session token to use for this cookie.
 	 * @return string Authentication cookie contents. Empty string if user does not exist.
 	 */
 	function wp_generate_auth_cookie( $user_id, $expiration, $scheme = 'auth', $token = '' ) {
 		$user = get_userdata( $user_id );
 		if ( ! $user ) {
 			return '';
 		}
 
 		if ( ! $token ) {
 			$manager = WP_Session_Tokens::get_instance( $user_id );
 			$token   = $manager->create( $expiration );
 		}
 
 		$pass_frag = substr( $user->user_pass, 8, 4 );
 
 		$key = wp_hash( $user->user_login . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme );
 
 		// If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
 		$algo = function_exists( 'hash' ) ? 'sha256' : 'sha1';
 		$hash = hash_hmac( $algo, $user->user_login . '|' . $expiration . '|' . $token, $key );
 
 		$cookie = $user->user_login . '|' . $expiration . '|' . $token . '|' . $hash;
 
 		/**
 		 * Filters the authentication cookie.
 		 *
 		 * @since 2.5.0
 		 * @since 4.0.0 The `$token` parameter was added.
 		 *
 		 * @param string $cookie     Authentication cookie.
 		 * @param int    $user_id    User ID.
 		 * @param int    $expiration The time the cookie expires as a UNIX timestamp.
 		 * @param string $scheme     Cookie scheme used. Accepts 'auth', 'secure_auth', or 'logged_in'.
 		 * @param string $token      User's session token used.
 		 */
 		return apply_filters( 'auth_cookie', $cookie, $user_id, $expiration, $scheme, $token );
 	}
 endif;
 
 if ( ! function_exists( 'wp_parse_auth_cookie' ) ) :
 	/**
 	 * Parses a cookie into its components.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @param string $cookie Authentication cookie.
 	 * @param string $scheme Optional. The cookie scheme to use: 'auth', 'secure_auth', or 'logged_in'.
 	 * @return string[]|false Authentication cookie components.
 	 */
 	function wp_parse_auth_cookie( $cookie = '', $scheme = '' ) {
 		if ( empty( $cookie ) ) {
 			switch ( $scheme ) {
 				case 'auth':
 					$cookie_name = AUTH_COOKIE;
 					break;
 				case 'secure_auth':
 					$cookie_name = SECURE_AUTH_COOKIE;
 					break;
 				case 'logged_in':
 					$cookie_name = LOGGED_IN_COOKIE;
 					break;
 				default:
 					if ( is_ssl() ) {
 						$cookie_name = SECURE_AUTH_COOKIE;
 						$scheme      = 'secure_auth';
 					} else {
 						$cookie_name = AUTH_COOKIE;
 						$scheme      = 'auth';
 					}
 			}
 
 			if ( empty( $_COOKIE[ $cookie_name ] ) ) {
 				return false;
 			}
 			$cookie = $_COOKIE[ $cookie_name ];
 		}
 
 		$cookie_elements = explode( '|', $cookie );
 		if ( count( $cookie_elements ) !== 4 ) {
 			return false;
 		}
 
 		list( $username, $expiration, $token, $hmac ) = $cookie_elements;
 
 		return compact( 'username', 'expiration', 'token', 'hmac', 'scheme' );
 	}
 endif;
 
 if ( ! function_exists( 'wp_set_auth_cookie' ) ) :
 	/**
 	 * Sets the authentication cookies based on user ID.
 	 *
 	 * The $remember parameter increases the time that the cookie will be kept. The
 	 * default the cookie is kept without remembering is two days. When $remember is
 	 * set, the cookies will be kept for 14 days or two weeks.
 	 *
 	 * @since 2.5.0
 	 * @since 4.3.0 Added the `$token` parameter.
 	 *
 	 * @param int         $user_id  User ID.
 	 * @param bool        $remember Whether to remember the user.
 	 * @param bool|string $secure   Whether the auth cookie should only be sent over HTTPS. Default is an empty
 	 *                              string which means the value of `is_ssl()` will be used.
 	 * @param string      $token    Optional. User's session token to use for this cookie.
 	 */
 	function wp_set_auth_cookie( $user_id, $remember = false, $secure = '', $token = '' ) {
 		if ( $remember ) {
 			/**
 			 * Filters the duration of the authentication cookie expiration period.
 			 *
 			 * @since 2.8.0
 			 *
 			 * @param int  $length   Duration of the expiration period in seconds.
 			 * @param int  $user_id  User ID.
 			 * @param bool $remember Whether to remember the user login. Default false.
 			 */
 			$expiration = time() + apply_filters( 'auth_cookie_expiration', 14 * DAY_IN_SECONDS, $user_id, $remember );
 
 			/*
 			 * Ensure the browser will continue to send the cookie after the expiration time is reached.
 			 * Needed for the login grace period in wp_validate_auth_cookie().
 			 */
 			$expire = $expiration + ( 12 * HOUR_IN_SECONDS );
 		} else {
 			/** This filter is documented in wp-includes/pluggable.php */
 			$expiration = time() + apply_filters( 'auth_cookie_expiration', 2 * DAY_IN_SECONDS, $user_id, $remember );
 			$expire     = 0;
 		}
 
 		if ( '' === $secure ) {
 			$secure = is_ssl();
 		}
 
 		// Front-end cookie is secure when the auth cookie is secure and the site's home URL uses HTTPS.
 		$secure_logged_in_cookie = $secure && 'https' === parse_url( get_option( 'home' ), PHP_URL_SCHEME );
 
 		/**
 		 * Filters whether the auth cookie should only be sent over HTTPS.
 		 *
 		 * @since 3.1.0
 		 *
 		 * @param bool $secure  Whether the cookie should only be sent over HTTPS.
 		 * @param int  $user_id User ID.
 		 */
 		$secure = apply_filters( 'secure_auth_cookie', $secure, $user_id );
 
 		/**
 		 * Filters whether the logged in cookie should only be sent over HTTPS.
 		 *
 		 * @since 3.1.0
 		 *
 		 * @param bool $secure_logged_in_cookie Whether the logged in cookie should only be sent over HTTPS.
 		 * @param int  $user_id                 User ID.
 		 * @param bool $secure                  Whether the auth cookie should only be sent over HTTPS.
 		 */
 		$secure_logged_in_cookie = apply_filters( 'secure_logged_in_cookie', $secure_logged_in_cookie, $user_id, $secure );
 
 		if ( $secure ) {
 			$auth_cookie_name = SECURE_AUTH_COOKIE;
 			$scheme           = 'secure_auth';
 		} else {
 			$auth_cookie_name = AUTH_COOKIE;
 			$scheme           = 'auth';
 		}
 
 		if ( '' === $token ) {
 			$manager = WP_Session_Tokens::get_instance( $user_id );
 			$token   = $manager->create( $expiration );
 		}
 
 		$auth_cookie      = wp_generate_auth_cookie( $user_id, $expiration, $scheme, $token );
 		$logged_in_cookie = wp_generate_auth_cookie( $user_id, $expiration, 'logged_in', $token );
 
 		/**
 		 * Fires immediately before the authentication cookie is set.
 		 *
 		 * @since 2.5.0
 		 * @since 4.9.0 The `$token` parameter was added.
 		 *
 		 * @param string $auth_cookie Authentication cookie value.
 		 * @param int    $expire      The time the login grace period expires as a UNIX timestamp.
 		 *                            Default is 12 hours past the cookie's expiration time.
 		 * @param int    $expiration  The time when the authentication cookie expires as a UNIX timestamp.
 		 *                            Default is 14 days from now.
 		 * @param int    $user_id     User ID.
 		 * @param string $scheme      Authentication scheme. Values include 'auth' or 'secure_auth'.
 		 * @param string $token       User's session token to use for this cookie.
 		 */
 		do_action( 'set_auth_cookie', $auth_cookie, $expire, $expiration, $user_id, $scheme, $token );
 
 		/**
 		 * Fires immediately before the logged-in authentication cookie is set.
 		 *
 		 * @since 2.6.0
 		 * @since 4.9.0 The `$token` parameter was added.
 		 *
 		 * @param string $logged_in_cookie The logged-in cookie value.
 		 * @param int    $expire           The time the login grace period expires as a UNIX timestamp.
 		 *                                 Default is 12 hours past the cookie's expiration time.
 		 * @param int    $expiration       The time when the logged-in authentication cookie expires as a UNIX timestamp.
 		 *                                 Default is 14 days from now.
 		 * @param int    $user_id          User ID.
 		 * @param string $scheme           Authentication scheme. Default 'logged_in'.
 		 * @param string $token            User's session token to use for this cookie.
 		 */
 		do_action( 'set_logged_in_cookie', $logged_in_cookie, $expire, $expiration, $user_id, 'logged_in', $token );
 
 		/**
 		 * Allows preventing auth cookies from actually being sent to the client.
 		 *
 		 * @since 4.7.4
 		 *
 		 * @param bool $send Whether to send auth cookies to the client.
 		 */
 		if ( ! apply_filters( 'send_auth_cookies', true ) ) {
 			return;
 		}
 
 		setcookie( $auth_cookie_name, $auth_cookie, $expire, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN, $secure, true );
 		setcookie( $auth_cookie_name, $auth_cookie, $expire, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, $secure, true );
 		setcookie( LOGGED_IN_COOKIE, $logged_in_cookie, $expire, COOKIEPATH, COOKIE_DOMAIN, $secure_logged_in_cookie, true );
 		if ( COOKIEPATH != SITECOOKIEPATH ) {
 			setcookie( LOGGED_IN_COOKIE, $logged_in_cookie, $expire, SITECOOKIEPATH, COOKIE_DOMAIN, $secure_logged_in_cookie, true );
 		}
 	}
 endif;
 
 if ( ! function_exists( 'wp_clear_auth_cookie' ) ) :
 	/**
 	 * Removes all of the cookies associated with authentication.
 	 *
 	 * @since 2.5.0
 	 */
 	function wp_clear_auth_cookie() {
 		/**
 		 * Fires just before the authentication cookies are cleared.
 		 *
 		 * @since 2.7.0
 		 */
 		do_action( 'clear_auth_cookie' );
 
 		/** This filter is documented in wp-includes/pluggable.php */
 		if ( ! apply_filters( 'send_auth_cookies', true ) ) {
 			return;
 		}
 
 		// Auth cookies.
 		setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN );
 		setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN );
 		setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN );
 		setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN );
 		setcookie( LOGGED_IN_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN );
 		setcookie( LOGGED_IN_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
 
 		// Settings cookies.
 		setcookie( 'wp-settings-' . get_current_user_id(), ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH );
 		setcookie( 'wp-settings-time-' . get_current_user_id(), ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH );
 
 		// Old cookies.
 		setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN );
 		setcookie( AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
 		setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN );
 		setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
 
 		// Even older cookies.
 		setcookie( USER_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN );
 		setcookie( PASS_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN );
 		setcookie( USER_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
 		setcookie( PASS_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
 
 		// Post password cookie.
 		setcookie( 'wp-postpass_' . COOKIEHASH, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN );
 	}
 endif;
 
 if ( ! function_exists( 'is_user_logged_in' ) ) :
 	/**
 	 * Determines whether the current visitor is a logged in user.
 	 *
 	 * 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 2.0.0
 	 *
 	 * @return bool True if user is logged in, false if not logged in.
 	 */
 	function is_user_logged_in() {
 		$user = wp_get_current_user();
 
 		return $user->exists();
 	}
 endif;
 
 if ( ! function_exists( 'auth_redirect' ) ) :
 	/**
 	 * Checks if a user is logged in, if not it redirects them to the login page.
 	 *
 	 * When this code is called from a page, it checks to see if the user viewing the page is logged in.
 	 * If the user is not logged in, they are redirected to the login page. The user is redirected
 	 * in such a way that, upon logging in, they will be sent directly to the page they were originally
 	 * trying to access.
 	 *
 	 * @since 1.5.0
 	 */
 	function auth_redirect() {
 		$secure = ( is_ssl() || force_ssl_admin() );
 
 		/**
 		 * Filters whether to use a secure authentication redirect.
 		 *
 		 * @since 3.1.0
 		 *
 		 * @param bool $secure Whether to use a secure authentication redirect. Default false.
 		 */
 		$secure = apply_filters( 'secure_auth_redirect', $secure );
 
 		// If https is required and request is http, redirect.
 		if ( $secure && ! is_ssl() && false !== strpos( $_SERVER['REQUEST_URI'], 'wp-admin' ) ) {
 			if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
 				wp_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) );
 				exit;
 			} else {
 				wp_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
 				exit;
 			}
 		}
 
 		/**
 		 * Filters the authentication redirect scheme.
 		 *
 		 * @since 2.9.0
 		 *
 		 * @param string $scheme Authentication redirect scheme. Default empty.
 		 */
 		$scheme = apply_filters( 'auth_redirect_scheme', '' );
 
 		$user_id = wp_validate_auth_cookie( '', $scheme );
 		if ( $user_id ) {
 			/**
 			 * Fires before the authentication redirect.
 			 *
 			 * @since 2.8.0
 			 *
 			 * @param int $user_id User ID.
 			 */
 			do_action( 'auth_redirect', $user_id );
 
 			// If the user wants ssl but the session is not ssl, redirect.
 			if ( ! $secure && get_user_option( 'use_ssl', $user_id ) && false !== strpos( $_SERVER['REQUEST_URI'], 'wp-admin' ) ) {
 				if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
 					wp_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) );
 					exit;
 				} else {
 					wp_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
 					exit;
 				}
 			}
 
 			return; // The cookie is good, so we're done.
 		}
 
 		// The cookie is no good, so force login.
 		nocache_headers();
 
 		$redirect = ( strpos( $_SERVER['REQUEST_URI'], '/options.php' ) && wp_get_referer() ) ? wp_get_referer() : set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
 
 		$login_url = wp_login_url( $redirect, true );
 
 		wp_redirect( $login_url );
 		exit;
 	}
 endif;
 
 if ( ! function_exists( 'check_admin_referer' ) ) :
 	/**
 	 * Ensures intent by verifying that a user was referred from another admin page with the correct security nonce.
 	 *
 	 * This function ensures the user intends to perform a given action, which helps protect against clickjacking style
 	 * attacks. It verifies intent, not authorisation, therefore it does not verify the user's capabilities. This should
 	 * be performed with `current_user_can()` or similar.
 	 *
 	 * If the nonce value is invalid, the function will exit with an "Are You Sure?" style message.
 	 *
 	 * @since 1.2.0
 	 * @since 2.5.0 The `$query_arg` parameter was added.
 	 *
 	 * @param int|string $action    The nonce action.
 	 * @param string     $query_arg Optional. Key to check for nonce in `$_REQUEST`. Default '_wpnonce'.
 	 * @return int|false 1 if the nonce is valid and generated between 0-12 hours ago,
 	 *                   2 if the nonce is valid and generated between 12-24 hours ago.
 	 *                   False if the nonce is invalid.
 	 */
 	function check_admin_referer( $action = -1, $query_arg = '_wpnonce' ) {
 		if ( -1 === $action ) {
 			_doing_it_wrong( __FUNCTION__, __( 'You should specify an action to be verified by using the first parameter.' ), '3.2.0' );
 		}
 
 		$adminurl = strtolower( admin_url() );
 		$referer  = strtolower( wp_get_referer() );
 		$result   = isset( $_REQUEST[ $query_arg ] ) ? wp_verify_nonce( $_REQUEST[ $query_arg ], $action ) : false;
 
 		/**
 		 * Fires once the admin request has been validated or not.
 		 *
 		 * @since 1.5.1
 		 *
 		 * @param string    $action The nonce action.
 		 * @param false|int $result False if the nonce is invalid, 1 if the nonce is valid and generated between
 		 *                          0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.
 		 */
 		do_action( 'check_admin_referer', $action, $result );
 
 		if ( ! $result && ! ( -1 === $action && strpos( $referer, $adminurl ) === 0 ) ) {
 			wp_nonce_ays( $action );
 			die();
 		}
 
 		return $result;
 	}
 endif;
 
 if ( ! function_exists( 'check_ajax_referer' ) ) :
 	/**
 	 * Verifies the Ajax request to prevent processing requests external of the blog.
 	 *
 	 * @since 2.0.3
 	 *
 	 * @param int|string   $action    Action nonce.
 	 * @param false|string $query_arg Optional. Key to check for the nonce in `$_REQUEST` (since 2.5). If false,
 	 *                                `$_REQUEST` values will be evaluated for '_ajax_nonce', and '_wpnonce'
 	 *                                (in that order). Default false.
 	 * @param bool         $die       Optional. Whether to die early when the nonce cannot be verified.
 	 *                                Default true.
 	 * @return int|false 1 if the nonce is valid and generated between 0-12 hours ago,
 	 *                   2 if the nonce is valid and generated between 12-24 hours ago.
 	 *                   False if the nonce is invalid.
 	 */
 	function check_ajax_referer( $action = -1, $query_arg = false, $die = true ) {
 		if ( -1 == $action ) {
 			_doing_it_wrong( __FUNCTION__, __( 'You should specify an action to be verified by using the first parameter.' ), '4.7.0' );
 		}
 
 		$nonce = '';
 
 		if ( $query_arg && isset( $_REQUEST[ $query_arg ] ) ) {
 			$nonce = $_REQUEST[ $query_arg ];
 		} elseif ( isset( $_REQUEST['_ajax_nonce'] ) ) {
 			$nonce = $_REQUEST['_ajax_nonce'];
 		} elseif ( isset( $_REQUEST['_wpnonce'] ) ) {
 			$nonce = $_REQUEST['_wpnonce'];
 		}
 
 		$result = wp_verify_nonce( $nonce, $action );
 
 		/**
 		 * Fires once the Ajax request has been validated or not.
 		 *
 		 * @since 2.1.0
 		 *
 		 * @param string    $action The Ajax nonce action.
 		 * @param false|int $result False if the nonce is invalid, 1 if the nonce is valid and generated between
 		 *                          0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.
 		 */
 		do_action( 'check_ajax_referer', $action, $result );
 
 		if ( $die && false === $result ) {
 			if ( wp_doing_ajax() ) {
 				wp_die( -1, 403 );
 			} else {
 				die( '-1' );
 			}
 		}
 
 		return $result;
 	}
 endif;
 
 if ( ! function_exists( 'wp_redirect' ) ) :
 	/**
 	 * Redirects to another page.
 	 *
 	 * Note: wp_redirect() does not exit automatically, and should almost always be
 	 * followed by a call to `exit;`:
 	 *
 	 *     wp_redirect( $url );
 	 *     exit;
 	 *
 	 * Exiting can also be selectively manipulated by using wp_redirect() as a conditional
 	 * in conjunction with the {@see 'wp_redirect'} and {@see 'wp_redirect_location'} filters:
 	 *
 	 *     if ( wp_redirect( $url ) ) {
 	 *         exit;
 	 *     }
 	 *
 	 * @since 1.5.1
 	 * @since 5.1.0 The `$x_redirect_by` parameter was added.
 	 * @since 5.4.0 On invalid status codes, wp_die() is called.
 	 *
 	 * @global bool $is_IIS
 	 *
 	 * @param string $location      The path or URL to redirect to.
 	 * @param int    $status        Optional. HTTP response status code to use. Default '302' (Moved Temporarily).
 	 * @param string $x_redirect_by Optional. The application doing the redirect. Default 'WordPress'.
 	 * @return bool False if the redirect was cancelled, true otherwise.
 	 */
 	function wp_redirect( $location, $status = 302, $x_redirect_by = 'WordPress' ) {
 		global $is_IIS;
 
 		/**
 		 * Filters the redirect location.
 		 *
 		 * @since 2.1.0
 		 *
 		 * @param string $location The path or URL to redirect to.
 		 * @param int    $status   The HTTP response status code to use.
 		 */
 		$location = apply_filters( 'wp_redirect', $location, $status );
 
 		/**
 		 * Filters the redirect HTTP response status code to use.
 		 *
 		 * @since 2.3.0
 		 *
 		 * @param int    $status   The HTTP response status code to use.
 		 * @param string $location The path or URL to redirect to.
 		 */
 		$status = apply_filters( 'wp_redirect_status', $status, $location );
 
 		if ( ! $location ) {
 			return false;
 		}
 
 		if ( $status < 300 || 399 < $status ) {
 			wp_die( __( 'HTTP redirect status code must be a redirection code, 3xx.' ) );
 		}
 
 		$location = wp_sanitize_redirect( $location );
 
 		if ( ! $is_IIS && 'cgi-fcgi' !== PHP_SAPI ) {
 			status_header( $status ); // This causes problems on IIS and some FastCGI setups.
 		}
 
 		/**
 		 * Filters the X-Redirect-By header.
 		 *
 		 * Allows applications to identify themselves when they're doing a redirect.
 		 *
 		 * @since 5.1.0
 		 *
 		 * @param string $x_redirect_by The application doing the redirect.
 		 * @param int    $status        Status code to use.
 		 * @param string $location      The path to redirect to.
 		 */
 		$x_redirect_by = apply_filters( 'x_redirect_by', $x_redirect_by, $status, $location );
 		if ( is_string( $x_redirect_by ) ) {
 			header( "X-Redirect-By: $x_redirect_by" );
 		}
 
 		header( "Location: $location", true, $status );
 
 		return true;
 	}
 endif;
 
 if ( ! function_exists( 'wp_sanitize_redirect' ) ) :
 	/**
 	 * Sanitizes a URL for use in a redirect.
 	 *
 	 * @since 2.3.0
 	 *
 	 * @param string $location The path to redirect to.
 	 * @return string Redirect-sanitized URL.
 	 */
 	function wp_sanitize_redirect( $location ) {
 		// Encode spaces.
 		$location = str_replace( ' ', '%20', $location );
 
 		$regex    = '/
 		(
 			(?: [\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}
 		){1,40}                              # ...one or more times
 		)/x';
 		$location = preg_replace_callback( $regex, '_wp_sanitize_utf8_in_redirect', $location );
 		$location = preg_replace( '|[^a-z0-9-~+_.?#=&;,/:%!*\[\]()@]|i', '', $location );
 		$location = wp_kses_no_null( $location );
 
 		// Remove %0D and %0A from location.
 		$strip = array( '%0d', '%0a', '%0D', '%0A' );
 		return _deep_replace( $strip, $location );
 	}
 
 	/**
 	 * URL encode UTF-8 characters in a URL.
 	 *
 	 * @ignore
 	 * @since 4.2.0
 	 * @access private
 	 *
 	 * @see wp_sanitize_redirect()
 	 *
 	 * @param array $matches RegEx matches against the redirect location.
 	 * @return string URL-encoded version of the first RegEx match.
 	 */
 	function _wp_sanitize_utf8_in_redirect( $matches ) {
 		return urlencode( $matches[0] );
 	}
 endif;
 
 if ( ! function_exists( 'wp_safe_redirect' ) ) :
 	/**
 	 * Performs a safe (local) redirect, using wp_redirect().
 	 *
 	 * Checks whether the $location is using an allowed host, if it has an absolute
 	 * path. A plugin can therefore set or remove allowed host(s) to or from the
 	 * list.
 	 *
 	 * If the host is not allowed, then the redirect defaults to wp-admin on the siteurl
 	 * instead. This prevents malicious redirects which redirect to another host,
 	 * but only used in a few places.
 	 *
 	 * Note: wp_safe_redirect() does not exit automatically, and should almost always be
 	 * followed by a call to `exit;`:
 	 *
 	 *     wp_safe_redirect( $url );
 	 *     exit;
 	 *
 	 * Exiting can also be selectively manipulated by using wp_safe_redirect() as a conditional
 	 * in conjunction with the {@see 'wp_redirect'} and {@see 'wp_redirect_location'} filters:
 	 *
 	 *     if ( wp_safe_redirect( $url ) ) {
 	 *         exit;
 	 *     }
 	 *
 	 * @since 2.3.0
 	 * @since 5.1.0 The return value from wp_redirect() is now passed on, and the `$x_redirect_by` parameter was added.
 	 *
 	 * @param string $location      The path or URL to redirect to.
 	 * @param int    $status        Optional. HTTP response status code to use. Default '302' (Moved Temporarily).
 	 * @param string $x_redirect_by Optional. The application doing the redirect. Default 'WordPress'.
 	 * @return bool False if the redirect was cancelled, true otherwise.
 	 */
 	function wp_safe_redirect( $location, $status = 302, $x_redirect_by = 'WordPress' ) {
 
 		// Need to look at the URL the way it will end up in wp_redirect().
 		$location = wp_sanitize_redirect( $location );
 
 		/**
 		 * Filters the redirect fallback URL for when the provided redirect is not safe (local).
 		 *
 		 * @since 4.3.0
 		 *
 		 * @param string $fallback_url The fallback URL to use by default.
 		 * @param int    $status       The HTTP response status code to use.
 		 */
 		$location = wp_validate_redirect( $location, apply_filters( 'wp_safe_redirect_fallback', admin_url(), $status ) );
 
 		return wp_redirect( $location, $status, $x_redirect_by );
 	}
 endif;
 
 if ( ! function_exists( 'wp_validate_redirect' ) ) :
 	/**
 	 * Validates a URL for use in a redirect.
 	 *
 	 * Checks whether the $location is using an allowed host, if it has an absolute
 	 * path. A plugin can therefore set or remove allowed host(s) to or from the
 	 * list.
 	 *
 	 * If the host is not allowed, then the redirect is to $default supplied
 	 *
 	 * @since 2.8.1
 	 *
 	 * @param string $location The redirect to validate
 	 * @param string $default  The value to return if $location is not allowed
 	 * @return string redirect-sanitized URL
 	 */
 	function wp_validate_redirect( $location, $default = '' ) {
 		$location = wp_sanitize_redirect( trim( $location, " \t\n\r\0\x08\x0B" ) );
 		// Browsers will assume 'http' is your protocol, and will obey a redirect to a URL starting with '//'.
 		if ( '//' === substr( $location, 0, 2 ) ) {
 			$location = 'http:' . $location;
 		}
 
 		// In PHP 5 parse_url() may fail if the URL query part contains 'http://'.
 		// See https://bugs.php.net/bug.php?id=38143
 		$cut  = strpos( $location, '?' );
 		$test = $cut ? substr( $location, 0, $cut ) : $location;
 
 		$lp = parse_url( $test );
 
 		// Give up if malformed URL.
 		if ( false === $lp ) {
 			return $default;
 		}
 
 		// Allow only 'http' and 'https' schemes. No 'data:', etc.
 		if ( isset( $lp['scheme'] ) && ! ( 'http' === $lp['scheme'] || 'https' === $lp['scheme'] ) ) {
 			return $default;
 		}
 
 		if ( ! isset( $lp['host'] ) && ! empty( $lp['path'] ) && '/' !== $lp['path'][0] ) {
 			$path = '';
 			if ( ! empty( $_SERVER['REQUEST_URI'] ) ) {
 				$path = dirname( parse_url( 'http://placeholder' . $_SERVER['REQUEST_URI'], PHP_URL_PATH ) . '?' );
 				$path = wp_normalize_path( $path );
 			}
 			$location = '/' . ltrim( $path . '/', '/' ) . $location;
 		}
 
 		// Reject if certain components are set but host is not.
 		// This catches URLs like https:host.com for which parse_url() does not set the host field.
 		if ( ! isset( $lp['host'] ) && ( isset( $lp['scheme'] ) || isset( $lp['user'] ) || isset( $lp['pass'] ) || isset( $lp['port'] ) ) ) {
 			return $default;
 		}
 
 		// Reject malformed components parse_url() can return on odd inputs.
 		foreach ( array( 'user', 'pass', 'host' ) as $component ) {
 			if ( isset( $lp[ $component ] ) && strpbrk( $lp[ $component ], ':/?#@' ) ) {
 				return $default;
 			}
 		}
 
 		$wpp = parse_url( home_url() );
 
 		/**
 		 * Filters the list of allowed hosts to redirect to.
 		 *
 		 * @since 2.3.0
 		 *
 		 * @param string[] $hosts An array of allowed host names.
 		 * @param string   $host  The host name of the redirect destination; empty string if not set.
 		 */
 		$allowed_hosts = (array) apply_filters( 'allowed_redirect_hosts', array( $wpp['host'] ), isset( $lp['host'] ) ? $lp['host'] : '' );
 
 		if ( isset( $lp['host'] ) && ( ! in_array( $lp['host'], $allowed_hosts, true ) && strtolower( $wpp['host'] ) !== $lp['host'] ) ) {
 			$location = $default;
 		}
 
 		return $location;
 	}
 endif;
 
 if ( ! function_exists( 'wp_notify_postauthor' ) ) :
 	/**
 	 * Notify an author (and/or others) of a comment/trackback/pingback on a post.
 	 *
 	 * @since 1.0.0
 	 *
 	 * @param int|WP_Comment $comment_id Comment ID or WP_Comment object.
 	 * @param string         $deprecated Not used
 	 * @return bool True on completion. False if no email addresses were specified.
 	 */
 	function wp_notify_postauthor( $comment_id, $deprecated = null ) {
 		if ( null !== $deprecated ) {
 			_deprecated_argument( __FUNCTION__, '3.8.0' );
 		}
 
 		$comment = get_comment( $comment_id );
 		if ( empty( $comment ) || empty( $comment->comment_post_ID ) ) {
 			return false;
 		}
 
 		$post   = get_post( $comment->comment_post_ID );
 		$author = get_userdata( $post->post_author );
 
 		// Who to notify? By default, just the post author, but others can be added.
 		$emails = array();
 		if ( $author ) {
 			$emails[] = $author->user_email;
 		}
 
 		/**
 		 * Filters the list of email addresses to receive a comment notification.
 		 *
 		 * By default, only post authors are notified of comments. This filter allows
 		 * others to be added.
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param string[] $emails     An array of email addresses to receive a comment notification.
 		 * @param int      $comment_id The comment ID.
 		 */
 		$emails = apply_filters( 'comment_notification_recipients', $emails, $comment->comment_ID );
 		$emails = array_filter( $emails );
 
 		// If there are no addresses to send the comment to, bail.
 		if ( ! count( $emails ) ) {
 			return false;
 		}
 
 		// Facilitate unsetting below without knowing the keys.
 		$emails = array_flip( $emails );
 
 		/**
 		 * Filters whether to notify comment authors of their comments on their own posts.
 		 *
 		 * By default, comment authors aren't notified of their comments on their own
 		 * posts. This filter allows you to override that.
 		 *
 		 * @since 3.8.0
 		 *
 		 * @param bool $notify     Whether to notify the post author of their own comment.
 		 *                         Default false.
 		 * @param int  $comment_id The comment ID.
 		 */
 		$notify_author = apply_filters( 'comment_notification_notify_author', false, $comment->comment_ID );
 
 		// The comment was left by the author.
 		if ( $author && ! $notify_author && $comment->user_id == $post->post_author ) {
 			unset( $emails[ $author->user_email ] );
 		}
 
 		// The author moderated a comment on their own post.
 		if ( $author && ! $notify_author && get_current_user_id() == $post->post_author ) {
 			unset( $emails[ $author->user_email ] );
 		}
 
 		// The post author is no longer a member of the blog.
 		if ( $author && ! $notify_author && ! user_can( $post->post_author, 'read_post', $post->ID ) ) {
 			unset( $emails[ $author->user_email ] );
 		}
 
 		// If there's no email to send the comment to, bail, otherwise flip array back around for use below.
 		if ( ! count( $emails ) ) {
 			return false;
 		} else {
 			$emails = array_flip( $emails );
 		}
 
 		$switched_locale = switch_to_locale( get_locale() );
 
 		$comment_author_domain = '';
 		if ( WP_Http::is_ip_address( $comment->comment_author_IP ) ) {
 			$comment_author_domain = gethostbyaddr( $comment->comment_author_IP );
 		}
 
 		// The blogname option is escaped with esc_html() on the way into the database in sanitize_option().
 		// We want to reverse this for the plain text arena of emails.
 		$blogname        = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 		$comment_content = wp_specialchars_decode( $comment->comment_content );
 
 		switch ( $comment->comment_type ) {
 			case 'trackback':
 				/* translators: %s: Post title. */
 				$notify_message = sprintf( __( 'New trackback on your post "%s"' ), $post->post_title ) . "\r\n";
 				/* translators: 1: Trackback/pingback website name, 2: Website IP address, 3: Website hostname. */
 				$notify_message .= sprintf( __( 'Website: %1$s (IP address: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
 				/* translators: %s: Trackback/pingback/comment author URL. */
 				$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
 				/* translators: %s: Comment text. */
 				$notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
 				$notify_message .= __( 'You can see all trackbacks on this post here:' ) . "\r\n";
 				/* translators: Trackback notification email subject. 1: Site title, 2: Post title. */
 				$subject = sprintf( __( '[%1$s] Trackback: "%2$s"' ), $blogname, $post->post_title );
 				break;
 
 			case 'pingback':
 				/* translators: %s: Post title. */
 				$notify_message = sprintf( __( 'New pingback on your post "%s"' ), $post->post_title ) . "\r\n";
 				/* translators: 1: Trackback/pingback website name, 2: Website IP address, 3: Website hostname. */
 				$notify_message .= sprintf( __( 'Website: %1$s (IP address: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
 				/* translators: %s: Trackback/pingback/comment author URL. */
 				$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
 				/* translators: %s: Comment text. */
 				$notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
 				$notify_message .= __( 'You can see all pingbacks on this post here:' ) . "\r\n";
 				/* translators: Pingback notification email subject. 1: Site title, 2: Post title. */
 				$subject = sprintf( __( '[%1$s] Pingback: "%2$s"' ), $blogname, $post->post_title );
 				break;
 
 			default: // Comments.
 				/* translators: %s: Post title. */
 				$notify_message = sprintf( __( 'New comment on your post "%s"' ), $post->post_title ) . "\r\n";
 				/* translators: 1: Comment author's name, 2: Comment author's IP address, 3: Comment author's hostname. */
 				$notify_message .= sprintf( __( 'Author: %1$s (IP address: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
 				/* translators: %s: Comment author email. */
 				$notify_message .= sprintf( __( 'Email: %s' ), $comment->comment_author_email ) . "\r\n";
 				/* translators: %s: Trackback/pingback/comment author URL. */
 				$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
 
 				if ( $comment->comment_parent && user_can( $post->post_author, 'edit_comment', $comment->comment_parent ) ) {
 					/* translators: Comment moderation. %s: Parent comment edit URL. */
 					$notify_message .= sprintf( __( 'In reply to: %s' ), admin_url( "comment.php?action=editcomment&c={$comment->comment_parent}#wpbody-content" ) ) . "\r\n";
 				}
 
 				/* translators: %s: Comment text. */
 				$notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
 				$notify_message .= __( 'You can see all comments on this post here:' ) . "\r\n";
 				/* translators: Comment notification email subject. 1: Site title, 2: Post title. */
 				$subject = sprintf( __( '[%1$s] Comment: "%2$s"' ), $blogname, $post->post_title );
 				break;
 		}
 
 		$notify_message .= get_permalink( $comment->comment_post_ID ) . "#comments\r\n\r\n";
 		/* translators: %s: Comment URL. */
 		$notify_message .= sprintf( __( 'Permalink: %s' ), get_comment_link( $comment ) ) . "\r\n";
 
 		if ( user_can( $post->post_author, 'edit_comment', $comment->comment_ID ) ) {
 			if ( EMPTY_TRASH_DAYS ) {
 				/* translators: Comment moderation. %s: Comment action URL. */
 				$notify_message .= sprintf( __( 'Trash it: %s' ), admin_url( "comment.php?action=trash&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n";
 			} else {
 				/* translators: Comment moderation. %s: Comment action URL. */
 				$notify_message .= sprintf( __( 'Delete it: %s' ), admin_url( "comment.php?action=delete&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n";
 			}
 			/* translators: Comment moderation. %s: Comment action URL. */
 			$notify_message .= sprintf( __( 'Spam it: %s' ), admin_url( "comment.php?action=spam&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n";
 		}
 
 		$wp_email = 'wordpress@' . preg_replace( '#^www\.#', '', wp_parse_url( network_home_url(), PHP_URL_HOST ) );
 
 		if ( '' === $comment->comment_author ) {
 			$from = "From: \"$blogname\" <$wp_email>";
 			if ( '' !== $comment->comment_author_email ) {
 				$reply_to = "Reply-To: $comment->comment_author_email";
 			}
 		} else {
 			$from = "From: \"$comment->comment_author\" <$wp_email>";
 			if ( '' !== $comment->comment_author_email ) {
 				$reply_to = "Reply-To: \"$comment->comment_author_email\" <$comment->comment_author_email>";
 			}
 		}
 
 		$message_headers = "$from\n"
 		. 'Content-Type: text/plain; charset="' . get_option( 'blog_charset' ) . "\"\n";
 
 		if ( isset( $reply_to ) ) {
 			$message_headers .= $reply_to . "\n";
 		}
 
 		/**
 		 * Filters the comment notification email text.
 		 *
 		 * @since 1.5.2
 		 *
 		 * @param string $notify_message The comment notification email text.
 		 * @param int    $comment_id     Comment ID.
 		 */
 		$notify_message = apply_filters( 'comment_notification_text', $notify_message, $comment->comment_ID );
 
 		/**
 		 * Filters the comment notification email subject.
 		 *
 		 * @since 1.5.2
 		 *
 		 * @param string $subject    The comment notification email subject.
 		 * @param int    $comment_id Comment ID.
 		 */
 		$subject = apply_filters( 'comment_notification_subject', $subject, $comment->comment_ID );
 
 		/**
 		 * Filters the comment notification email headers.
 		 *
 		 * @since 1.5.2
 		 *
 		 * @param string $message_headers Headers for the comment notification email.
 		 * @param int    $comment_id      Comment ID.
 		 */
 		$message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment->comment_ID );
 
 		foreach ( $emails as $email ) {
 			wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers );
 		}
 
 		if ( $switched_locale ) {
 			restore_previous_locale();
 		}
 
 		return true;
 	}
 endif;
 
 if ( ! function_exists( 'wp_notify_moderator' ) ) :
 	/**
 	 * Notifies the moderator of the site about a new comment that is awaiting approval.
 	 *
 	 * @since 1.0.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
 	 * Uses the {@see 'notify_moderator'} filter to determine whether the site moderator
 	 * should be notified, overriding the site setting.
 	 *
 	 * @param int $comment_id Comment ID.
 	 * @return true Always returns true.
 	 */
 	function wp_notify_moderator( $comment_id ) {
 		global $wpdb;
 
 		$maybe_notify = get_option( 'moderation_notify' );
 
 		/**
 		 * Filters whether to send the site moderator email notifications, overriding the site setting.
 		 *
 		 * @since 4.4.0
 		 *
 		 * @param bool $maybe_notify Whether to notify blog moderator.
 		 * @param int  $comment_ID   The id of the comment for the notification.
 		 */
 		$maybe_notify = apply_filters( 'notify_moderator', $maybe_notify, $comment_id );
 
 		if ( ! $maybe_notify ) {
 			return true;
 		}
 
 		$comment = get_comment( $comment_id );
 		$post    = get_post( $comment->comment_post_ID );
 		$user    = get_userdata( $post->post_author );
 		// Send to the administration and to the post author if the author can modify the comment.
 		$emails = array( get_option( 'admin_email' ) );
 		if ( $user && user_can( $user->ID, 'edit_comment', $comment_id ) && ! empty( $user->user_email ) ) {
 			if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) ) {
 				$emails[] = $user->user_email;
 			}
 		}
 
 		$switched_locale = switch_to_locale( get_locale() );
 
 		$comment_author_domain = '';
 		if ( WP_Http::is_ip_address( $comment->comment_author_IP ) ) {
 			$comment_author_domain = gethostbyaddr( $comment->comment_author_IP );
 		}
 
 		$comments_waiting = $wpdb->get_var( "SELECT COUNT(*) FROM $wpdb->comments WHERE comment_approved = '0'" );
 
 		// The blogname option is escaped with esc_html() on the way into the database in sanitize_option().
 		// We want to reverse this for the plain text arena of emails.
 		$blogname        = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 		$comment_content = wp_specialchars_decode( $comment->comment_content );
 
 		switch ( $comment->comment_type ) {
 			case 'trackback':
 				/* translators: %s: Post title. */
 				$notify_message  = sprintf( __( 'A new trackback on the post "%s" is waiting for your approval' ), $post->post_title ) . "\r\n";
 				$notify_message .= get_permalink( $comment->comment_post_ID ) . "\r\n\r\n";
 				/* translators: 1: Trackback/pingback website name, 2: Website IP address, 3: Website hostname. */
 				$notify_message .= sprintf( __( 'Website: %1$s (IP address: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
 				/* translators: %s: Trackback/pingback/comment author URL. */
 				$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
 				$notify_message .= __( 'Trackback excerpt: ' ) . "\r\n" . $comment_content . "\r\n\r\n";
 				break;
 
 			case 'pingback':
 				/* translators: %s: Post title. */
 				$notify_message  = sprintf( __( 'A new pingback on the post "%s" is waiting for your approval' ), $post->post_title ) . "\r\n";
 				$notify_message .= get_permalink( $comment->comment_post_ID ) . "\r\n\r\n";
 				/* translators: 1: Trackback/pingback website name, 2: Website IP address, 3: Website hostname. */
 				$notify_message .= sprintf( __( 'Website: %1$s (IP address: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
 				/* translators: %s: Trackback/pingback/comment author URL. */
 				$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
 				$notify_message .= __( 'Pingback excerpt: ' ) . "\r\n" . $comment_content . "\r\n\r\n";
 				break;
 
 			default: // Comments.
 				/* translators: %s: Post title. */
 				$notify_message  = sprintf( __( 'A new comment on the post "%s" is waiting for your approval' ), $post->post_title ) . "\r\n";
 				$notify_message .= get_permalink( $comment->comment_post_ID ) . "\r\n\r\n";
 				/* translators: 1: Comment author's name, 2: Comment author's IP address, 3: Comment author's hostname. */
 				$notify_message .= sprintf( __( 'Author: %1$s (IP address: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
 				/* translators: %s: Comment author email. */
 				$notify_message .= sprintf( __( 'Email: %s' ), $comment->comment_author_email ) . "\r\n";
 				/* translators: %s: Trackback/pingback/comment author URL. */
 				$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
 
 				if ( $comment->comment_parent ) {
 					/* translators: Comment moderation. %s: Parent comment edit URL. */
 					$notify_message .= sprintf( __( 'In reply to: %s' ), admin_url( "comment.php?action=editcomment&c={$comment->comment_parent}#wpbody-content" ) ) . "\r\n";
 				}
 
 				/* translators: %s: Comment text. */
 				$notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
 				break;
 		}
 
 		/* translators: Comment moderation. %s: Comment action URL. */
 		$notify_message .= sprintf( __( 'Approve it: %s' ), admin_url( "comment.php?action=approve&c={$comment_id}#wpbody-content" ) ) . "\r\n";
 
 		if ( EMPTY_TRASH_DAYS ) {
 			/* translators: Comment moderation. %s: Comment action URL. */
 			$notify_message .= sprintf( __( 'Trash it: %s' ), admin_url( "comment.php?action=trash&c={$comment_id}#wpbody-content" ) ) . "\r\n";
 		} else {
 			/* translators: Comment moderation. %s: Comment action URL. */
 			$notify_message .= sprintf( __( 'Delete it: %s' ), admin_url( "comment.php?action=delete&c={$comment_id}#wpbody-content" ) ) . "\r\n";
 		}
 
 		/* translators: Comment moderation. %s: Comment action URL. */
 		$notify_message .= sprintf( __( 'Spam it: %s' ), admin_url( "comment.php?action=spam&c={$comment_id}#wpbody-content" ) ) . "\r\n";
 
 		$notify_message .= sprintf(
 			/* translators: Comment moderation. %s: Number of comments awaiting approval. */
 			_n(
 				'Currently %s comment is waiting for approval. Please visit the moderation panel:',
 				'Currently %s comments are waiting for approval. Please visit the moderation panel:',
 				$comments_waiting
 			),
 			number_format_i18n( $comments_waiting )
 		) . "\r\n";
 		$notify_message .= admin_url( 'edit-comments.php?comment_status=moderated#wpbody-content' ) . "\r\n";
 
 		/* translators: Comment moderation notification email subject. 1: Site title, 2: Post title. */
 		$subject         = sprintf( __( '[%1$s] Please moderate: "%2$s"' ), $blogname, $post->post_title );
 		$message_headers = '';
 
 		/**
 		 * Filters the list of recipients for comment moderation emails.
 		 *
 		 * @since 3.7.0
 		 *
 		 * @param string[] $emails     List of email addresses to notify for comment moderation.
 		 * @param int      $comment_id Comment ID.
 		 */
 		$emails = apply_filters( 'comment_moderation_recipients', $emails, $comment_id );
 
 		/**
 		 * Filters the comment moderation email text.
 		 *
 		 * @since 1.5.2
 		 *
 		 * @param string $notify_message Text of the comment moderation email.
 		 * @param int    $comment_id     Comment ID.
 		 */
 		$notify_message = apply_filters( 'comment_moderation_text', $notify_message, $comment_id );
 
 		/**
 		 * Filters the comment moderation email subject.
 		 *
 		 * @since 1.5.2
 		 *
 		 * @param string $subject    Subject of the comment moderation email.
 		 * @param int    $comment_id Comment ID.
 		 */
 		$subject = apply_filters( 'comment_moderation_subject', $subject, $comment_id );
 
 		/**
 		 * Filters the comment moderation email headers.
 		 *
 		 * @since 2.8.0
 		 *
 		 * @param string $message_headers Headers for the comment moderation email.
 		 * @param int    $comment_id      Comment ID.
 		 */
 		$message_headers = apply_filters( 'comment_moderation_headers', $message_headers, $comment_id );
 
 		foreach ( $emails as $email ) {
 			wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers );
 		}
 
 		if ( $switched_locale ) {
 			restore_previous_locale();
 		}
 
 		return true;
 	}
 endif;
 
 if ( ! function_exists( 'wp_password_change_notification' ) ) :
 	/**
 	 * Notify the blog admin of a user changing password, normally via email.
 	 *
 	 * @since 2.7.0
 	 *
 	 * @param WP_User $user User object.
 	 */
 	function wp_password_change_notification( $user ) {
 		// Send a copy of password change notification to the admin,
 		// but check to see if it's the admin whose password we're changing, and skip this.
 		if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) ) {
 			/* translators: %s: User name. */
 			$message = sprintf( __( 'Password changed for user: %s' ), $user->user_login ) . "\r\n";
 			// The blogname option is escaped with esc_html() on the way into the database in sanitize_option().
 			// We want to reverse this for the plain text arena of emails.
 			$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 
 			$wp_password_change_notification_email = array(
 				'to'      => get_option( 'admin_email' ),
 				/* translators: Password change notification email subject. %s: Site title. */
 				'subject' => __( '[%s] Password Changed' ),
 				'message' => $message,
 				'headers' => '',
 			);
 
 			/**
 			 * Filters the contents of the password change notification email sent to the site admin.
 			 *
 			 * @since 4.9.0
 			 *
 			 * @param array   $wp_password_change_notification_email {
 			 *     Used to build wp_mail().
 			 *
 			 *     @type string $to      The intended recipient - site admin email address.
 			 *     @type string $subject The subject of the email.
 			 *     @type string $message The body of the email.
 			 *     @type string $headers The headers of the email.
 			 * }
 			 * @param WP_User $user     User object for user whose password was changed.
 			 * @param string  $blogname The site title.
 			 */
 			$wp_password_change_notification_email = apply_filters( 'wp_password_change_notification_email', $wp_password_change_notification_email, $user, $blogname );
 
 			wp_mail(
 				$wp_password_change_notification_email['to'],
 				wp_specialchars_decode( sprintf( $wp_password_change_notification_email['subject'], $blogname ) ),
 				$wp_password_change_notification_email['message'],
 				$wp_password_change_notification_email['headers']
 			);
 		}
 	}
 endif;
 
 if ( ! function_exists( 'wp_new_user_notification' ) ) :
 	/**
 	 * Email login credentials to a newly-registered user.
 	 *
 	 * A new user registration notification is also sent to admin email.
 	 *
 	 * @since 2.0.0
 	 * @since 4.3.0 The `$plaintext_pass` parameter was changed to `$notify`.
 	 * @since 4.3.1 The `$plaintext_pass` parameter was deprecated. `$notify` added as a third parameter.
 	 * @since 4.6.0 The `$notify` parameter accepts 'user' for sending notification only to the user created.
 	 *
 	 * @param int    $user_id    User ID.
 	 * @param null   $deprecated Not used (argument deprecated).
 	 * @param string $notify     Optional. Type of notification that should happen. Accepts 'admin' or an empty
 	 *                           string (admin only), 'user', or 'both' (admin and user). Default empty.
 	 */
 	function wp_new_user_notification( $user_id, $deprecated = null, $notify = '' ) {
 		if ( null !== $deprecated ) {
 			_deprecated_argument( __FUNCTION__, '4.3.1' );
 		}
 
 		// Accepts only 'user', 'admin' , 'both' or default '' as $notify.
 		if ( ! in_array( $notify, array( 'user', 'admin', 'both', '' ), true ) ) {
 			return;
 		}
 
 		$user = get_userdata( $user_id );
 
 		// The blogname option is escaped with esc_html() on the way into the database in sanitize_option().
 		// We want to reverse this for the plain text arena of emails.
 		$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 
 		if ( 'user' !== $notify ) {
 			$switched_locale = switch_to_locale( get_locale() );
 
 			/* translators: %s: Site title. */
 			$message = sprintf( __( 'New user registration on your site %s:' ), $blogname ) . "\r\n\r\n";
 			/* translators: %s: User login. */
 			$message .= sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
 			/* translators: %s: User email address. */
 			$message .= sprintf( __( 'Email: %s' ), $user->user_email ) . "\r\n";
 
 			$wp_new_user_notification_email_admin = array(
 				'to'      => get_option( 'admin_email' ),
 				/* translators: New user registration notification email subject. %s: Site title. */
 				'subject' => __( '[%s] New User Registration' ),
 				'message' => $message,
 				'headers' => '',
 			);
 
 			/**
 			 * Filters the contents of the new user notification email sent to the site admin.
 			 *
 			 * @since 4.9.0
 			 *
 			 * @param array   $wp_new_user_notification_email_admin {
 			 *     Used to build wp_mail().
 			 *
 			 *     @type string $to      The intended recipient - site admin email address.
 			 *     @type string $subject The subject of the email.
 			 *     @type string $message The body of the email.
 			 *     @type string $headers The headers of the email.
 			 * }
 			 * @param WP_User $user     User object for new user.
 			 * @param string  $blogname The site title.
 			 */
 			$wp_new_user_notification_email_admin = apply_filters( 'wp_new_user_notification_email_admin', $wp_new_user_notification_email_admin, $user, $blogname );
 
 			wp_mail(
 				$wp_new_user_notification_email_admin['to'],
 				wp_specialchars_decode( sprintf( $wp_new_user_notification_email_admin['subject'], $blogname ) ),
 				$wp_new_user_notification_email_admin['message'],
 				$wp_new_user_notification_email_admin['headers']
 			);
 
 			if ( $switched_locale ) {
 				restore_previous_locale();
 			}
 		}
 
 		// `$deprecated` was pre-4.3 `$plaintext_pass`. An empty `$plaintext_pass` didn't sent a user notification.
 		if ( 'admin' === $notify || ( empty( $deprecated ) && empty( $notify ) ) ) {
 			return;
 		}
 
 		$key = get_password_reset_key( $user );
 		if ( is_wp_error( $key ) ) {
 			return;
 		}
 
 		$switched_locale = switch_to_locale( get_user_locale( $user ) );
 
 		/* translators: %s: User login. */
 		$message  = sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
 		$message .= __( 'To set your password, visit the following address:' ) . "\r\n\r\n";
 		$message .= network_site_url( "wp-login.php?action=rp&key=$key&login=" . rawurlencode( $user->user_login ), 'login' ) . "\r\n\r\n";
 
 		$message .= wp_login_url() . "\r\n";
 
 		$wp_new_user_notification_email = array(
 			'to'      => $user->user_email,
 			/* translators: Login details notification email subject. %s: Site title. */
 			'subject' => __( '[%s] Login Details' ),
 			'message' => $message,
 			'headers' => '',
 		);
 
 		/**
 		 * Filters the contents of the new user notification email sent to the new user.
 		 *
 		 * @since 4.9.0
 		 *
 		 * @param array   $wp_new_user_notification_email {
 		 *     Used to build wp_mail().
 		 *
 		 *     @type string $to      The intended recipient - New user email address.
 		 *     @type string $subject The subject of the email.
 		 *     @type string $message The body of the email.
 		 *     @type string $headers The headers of the email.
 		 * }
 		 * @param WP_User $user     User object for new user.
 		 * @param string  $blogname The site title.
 		 */
 		$wp_new_user_notification_email = apply_filters( 'wp_new_user_notification_email', $wp_new_user_notification_email, $user, $blogname );
 
 		wp_mail(
 			$wp_new_user_notification_email['to'],
 			wp_specialchars_decode( sprintf( $wp_new_user_notification_email['subject'], $blogname ) ),
 			$wp_new_user_notification_email['message'],
 			$wp_new_user_notification_email['headers']
 		);
 
 		if ( $switched_locale ) {
 			restore_previous_locale();
 		}
 	}
 endif;
 
 if ( ! function_exists( 'wp_nonce_tick' ) ) :
 	/**
 	 * Returns the time-dependent variable for nonce creation.
 	 *
 	 * A nonce has a lifespan of two ticks. Nonces in their second tick may be
 	 * updated, e.g. by autosave.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @return float Float value rounded up to the next highest integer.
 	 */
 	function wp_nonce_tick() {
 		/**
 		 * Filters the lifespan of nonces in seconds.
 		 *
 		 * @since 2.5.0
 		 *
 		 * @param int $lifespan Lifespan of nonces in seconds. Default 86,400 seconds, or one day.
 		 */
 		$nonce_life = apply_filters( 'nonce_life', DAY_IN_SECONDS );
 
 		return ceil( time() / ( $nonce_life / 2 ) );
 	}
 endif;
 
 if ( ! function_exists( 'wp_verify_nonce' ) ) :
 	/**
 	 * Verifies that a correct security nonce was used with time limit.
 	 *
 	 * A nonce is valid for 24 hours (by default).
 	 *
 	 * @since 2.0.3
 	 *
 	 * @param string     $nonce  Nonce value that was used for verification, usually via a form field.
 	 * @param string|int $action Should give context to what is taking place and be the same when nonce was created.
 	 * @return int|false 1 if the nonce is valid and generated between 0-12 hours ago,
 	 *                   2 if the nonce is valid and generated between 12-24 hours ago.
 	 *                   False if the nonce is invalid.
 	 */
 	function wp_verify_nonce( $nonce, $action = -1 ) {
 		$nonce = (string) $nonce;
 		$user  = wp_get_current_user();
 		$uid   = (int) $user->ID;
 		if ( ! $uid ) {
 			/**
 			 * Filters whether the user who generated the nonce is logged out.
 			 *
 			 * @since 3.5.0
 			 *
 			 * @param int    $uid    ID of the nonce-owning user.
 			 * @param string $action The nonce action.
 			 */
 			$uid = apply_filters( 'nonce_user_logged_out', $uid, $action );
 		}
 
 		if ( empty( $nonce ) ) {
 			return false;
 		}
 
 		$token = wp_get_session_token();
 		$i     = wp_nonce_tick();
 
 		// Nonce generated 0-12 hours ago.
 		$expected = substr( wp_hash( $i . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 );
 		if ( hash_equals( $expected, $nonce ) ) {
 			return 1;
 		}
 
 		// Nonce generated 12-24 hours ago.
 		$expected = substr( wp_hash( ( $i - 1 ) . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 );
 		if ( hash_equals( $expected, $nonce ) ) {
 			return 2;
 		}
 
 		/**
 		 * Fires when nonce verification fails.
 		 *
 		 * @since 4.4.0
 		 *
 		 * @param string     $nonce  The invalid nonce.
 		 * @param string|int $action The nonce action.
 		 * @param WP_User    $user   The current user object.
 		 * @param string     $token  The user's session token.
 		 */
 		do_action( 'wp_verify_nonce_failed', $nonce, $action, $user, $token );
 
 		// Invalid nonce.
 		return false;
 	}
 endif;
 
 if ( ! function_exists( 'wp_create_nonce' ) ) :
 	/**
 	 * Creates a cryptographic token tied to a specific action, user, user session,
 	 * and window of time.
 	 *
 	 * @since 2.0.3
 	 * @since 4.0.0 Session tokens were integrated with nonce creation
 	 *
 	 * @param string|int $action Scalar value to add context to the nonce.
 	 * @return string The token.
 	 */
 	function wp_create_nonce( $action = -1 ) {
 		$user = wp_get_current_user();
 		$uid  = (int) $user->ID;
 		if ( ! $uid ) {
 			/** This filter is documented in wp-includes/pluggable.php */
 			$uid = apply_filters( 'nonce_user_logged_out', $uid, $action );
 		}
 
 		$token = wp_get_session_token();
 		$i     = wp_nonce_tick();
 
 		return substr( wp_hash( $i . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 );
 	}
 endif;
 
 if ( ! function_exists( 'wp_salt' ) ) :
 	/**
 	 * Returns a salt to add to hashes.
 	 *
 	 * Salts are created using secret keys. Secret keys are located in two places:
 	 * in the database and in the wp-config.php file. The secret key in the database
 	 * is randomly generated and will be appended to the secret keys in wp-config.php.
 	 *
 	 * The secret keys in wp-config.php should be updated to strong, random keys to maximize
 	 * security. Below is an example of how the secret key constants are defined.
 	 * Do not paste this example directly into wp-config.php. Instead, have a
 	 * {@link https://api.wordpress.org/secret-key/1.1/salt/ secret key created} just
 	 * for you.
 	 *
 	 *     define('AUTH_KEY',         ' Xakm<o xQy rw4EMsLKM-?!T+,PFF})H4lzcW57AF0U@N@< >M%G4Yt>f`z]MON');
 	 *     define('SECURE_AUTH_KEY',  'LzJ}op]mr|6+![P}Ak:uNdJCJZd>(Hx.-Mh#Tz)pCIU#uGEnfFz|f ;;eU%/U^O~');
 	 *     define('LOGGED_IN_KEY',    '|i|Ux`9<p-h$aFf(qnT:sDO:D1P^wZ$$/Ra@miTJi9G;ddp_<q}6H1)o|a +&JCM');
 	 *     define('NONCE_KEY',        '%:R{[P|,s.KuMltH5}cI;/k<Gx~j!f0I)m_sIyu+&NJZ)-iO>z7X>QYR0Z_XnZ@|');
 	 *     define('AUTH_SALT',        'eZyT)-Naw]F8CwA*VaW#q*|.)g@o}||wf~@C-YSt}(dh_r6EbI#A,y|nU2{B#JBW');
 	 *     define('SECURE_AUTH_SALT', '!=oLUTXh,QW=H `}`L|9/^4-3 STz},T(w}W<I`.JjPi)<Bmf1v,HpGe}T1:Xt7n');
 	 *     define('LOGGED_IN_SALT',   '+XSqHc;@Q*K_b|Z?NC[3H!!EONbh.n<+=uKR:>*c(u`g~EJBf#8u#R{mUEZrozmm');
 	 *     define('NONCE_SALT',       'h`GXHhD>SLWVfg1(1(N{;.V!MoE(SfbA_ksP@&`+AycHcAV$+?@3q+rxV{%^VyKT');
 	 *
 	 * Salting passwords helps against tools which has stored hashed values of
 	 * common dictionary strings. The added values makes it harder to crack.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @link https://api.wordpress.org/secret-key/1.1/salt/ Create secrets for wp-config.php
 	 *
 	 * @param string $scheme Authentication scheme (auth, secure_auth, logged_in, nonce)
 	 * @return string Salt value
 	 */
 	function wp_salt( $scheme = 'auth' ) {
 		static $cached_salts = array();
 		if ( isset( $cached_salts[ $scheme ] ) ) {
 			/**
 			 * Filters the WordPress salt.
 			 *
 			 * @since 2.5.0
 			 *
 			 * @param string $cached_salt Cached salt for the given scheme.
 			 * @param string $scheme      Authentication scheme. Values include 'auth',
 			 *                            'secure_auth', 'logged_in', and 'nonce'.
 			 */
 			return apply_filters( 'salt', $cached_salts[ $scheme ], $scheme );
 		}
 
 		static $duplicated_keys;
 		if ( null === $duplicated_keys ) {
 			$duplicated_keys = array( 'put your unique phrase here' => true );
 			foreach ( array( 'AUTH', 'SECURE_AUTH', 'LOGGED_IN', 'NONCE', 'SECRET' ) as $first ) {
 				foreach ( array( 'KEY', 'SALT' ) as $second ) {
 					if ( ! defined( "{$first}_{$second}" ) ) {
 						continue;
 					}
 					$value                     = constant( "{$first}_{$second}" );
 					$duplicated_keys[ $value ] = isset( $duplicated_keys[ $value ] );
 				}
 			}
 		}
 
 		$values = array(
 			'key'  => '',
 			'salt' => '',
 		);
 		if ( defined( 'SECRET_KEY' ) && SECRET_KEY && empty( $duplicated_keys[ SECRET_KEY ] ) ) {
 			$values['key'] = SECRET_KEY;
 		}
 		if ( 'auth' === $scheme && defined( 'SECRET_SALT' ) && SECRET_SALT && empty( $duplicated_keys[ SECRET_SALT ] ) ) {
 			$values['salt'] = SECRET_SALT;
 		}
 
 		if ( in_array( $scheme, array( 'auth', 'secure_auth', 'logged_in', 'nonce' ), true ) ) {
 			foreach ( array( 'key', 'salt' ) as $type ) {
 				$const = strtoupper( "{$scheme}_{$type}" );
 				if ( defined( $const ) && constant( $const ) && empty( $duplicated_keys[ constant( $const ) ] ) ) {
 					$values[ $type ] = constant( $const );
 				} elseif ( ! $values[ $type ] ) {
 					$values[ $type ] = get_site_option( "{$scheme}_{$type}" );
 					if ( ! $values[ $type ] ) {
 						$values[ $type ] = wp_generate_password( 64, true, true );
 						update_site_option( "{$scheme}_{$type}", $values[ $type ] );
 					}
 				}
 			}
 		} else {
 			if ( ! $values['key'] ) {
 				$values['key'] = get_site_option( 'secret_key' );
 				if ( ! $values['key'] ) {
 					$values['key'] = wp_generate_password( 64, true, true );
 					update_site_option( 'secret_key', $values['key'] );
 				}
 			}
 			$values['salt'] = hash_hmac( 'md5', $scheme, $values['key'] );
 		}
 
 		$cached_salts[ $scheme ] = $values['key'] . $values['salt'];
 
 		/** This filter is documented in wp-includes/pluggable.php */
 		return apply_filters( 'salt', $cached_salts[ $scheme ], $scheme );
 	}
 endif;
 
 if ( ! function_exists( 'wp_hash' ) ) :
 	/**
 	 * Get hash of given string.
 	 *
 	 * @since 2.0.3
 	 *
 	 * @param string $data   Plain text to hash
 	 * @param string $scheme Authentication scheme (auth, secure_auth, logged_in, nonce)
 	 * @return string Hash of $data
 	 */
 	function wp_hash( $data, $scheme = 'auth' ) {
 		$salt = wp_salt( $scheme );
 
 		return hash_hmac( 'md5', $data, $salt );
 	}
 endif;
 
 if ( ! function_exists( 'wp_hash_password' ) ) :
 	/**
 	 * Create a hash (encrypt) of a plain text password.
 	 *
 	 * For integration with other applications, this function can be overwritten to
 	 * instead use the other package password checking algorithm.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @global PasswordHash $wp_hasher PHPass object
 	 *
 	 * @param string $password Plain text user password to hash
 	 * @return string The hash string of the password
 	 */
 	function wp_hash_password( $password ) {
 		global $wp_hasher;
 
 		if ( empty( $wp_hasher ) ) {
 			require_once ABSPATH . WPINC . '/class-phpass.php';
 			// By default, use the portable hash from phpass.
 			$wp_hasher = new PasswordHash( 8, true );
 		}
 
 		return $wp_hasher->HashPassword( trim( $password ) );
 	}
 endif;
 
 if ( ! function_exists( 'wp_check_password' ) ) :
 	/**
 	 * Checks the plaintext password against the encrypted Password.
 	 *
 	 * Maintains compatibility between old version and the new cookie authentication
 	 * protocol using PHPass library. The $hash parameter is the encrypted password
 	 * and the function compares the plain text password when encrypted similarly
 	 * against the already encrypted password to see if they match.
 	 *
 	 * For integration with other applications, this function can be overwritten to
 	 * instead use the other package password checking algorithm.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @global PasswordHash $wp_hasher PHPass object used for checking the password
 	 *                                 against the $hash + $password
 	 * @uses PasswordHash::CheckPassword
 	 *
 	 * @param string     $password Plaintext user's password
 	 * @param string     $hash     Hash of the user's password to check against.
 	 * @param string|int $user_id  Optional. User ID.
 	 * @return bool False, if the $password does not match the hashed password
 	 */
 	function wp_check_password( $password, $hash, $user_id = '' ) {
 		global $wp_hasher;
 
 		// If the hash is still md5...
 		if ( strlen( $hash ) <= 32 ) {
 			$check = hash_equals( $hash, md5( $password ) );
 			if ( $check && $user_id ) {
 				// Rehash using new hash.
 				wp_set_password( $password, $user_id );
 				$hash = wp_hash_password( $password );
 			}
 
 			/**
 			 * Filters whether the plaintext password matches the encrypted password.
 			 *
 			 * @since 2.5.0
 			 *
 			 * @param bool       $check    Whether the passwords match.
 			 * @param string     $password The plaintext password.
 			 * @param string     $hash     The hashed password.
 			 * @param string|int $user_id  User ID. Can be empty.
 			 */
 			return apply_filters( 'check_password', $check, $password, $hash, $user_id );
 		}
 
 		// If the stored hash is longer than an MD5,
 		// presume the new style phpass portable hash.
 		if ( empty( $wp_hasher ) ) {
 			require_once ABSPATH . WPINC . '/class-phpass.php';
 			// By default, use the portable hash from phpass.
 			$wp_hasher = new PasswordHash( 8, true );
 		}
 
 		$check = $wp_hasher->CheckPassword( $password, $hash );
 
 		/** This filter is documented in wp-includes/pluggable.php */
 		return apply_filters( 'check_password', $check, $password, $hash, $user_id );
 	}
 endif;
 
 if ( ! function_exists( 'wp_generate_password' ) ) :
 	/**
 	 * Generates a random password drawn from the defined set of characters.
 	 *
 	 * Uses wp_rand() is used to create passwords with far less predictability
 	 * than similar native PHP functions like `rand()` or `mt_rand()`.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param int  $length              Optional. The length of password to generate. Default 12.
 	 * @param bool $special_chars       Optional. Whether to include standard special characters.
 	 *                                  Default true.
 	 * @param bool $extra_special_chars Optional. Whether to include other special characters.
 	 *                                  Used when generating secret keys and salts. Default false.
 	 * @return string The random password.
 	 */
 	function wp_generate_password( $length = 12, $special_chars = true, $extra_special_chars = false ) {
 		$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
 		if ( $special_chars ) {
 			$chars .= '!@#$%^&*()';
 		}
 		if ( $extra_special_chars ) {
 			$chars .= '-_ []{}<>~`+=,.;:/?|';
 		}
 
 		$password = '';
 		for ( $i = 0; $i < $length; $i++ ) {
 			$password .= substr( $chars, wp_rand( 0, strlen( $chars ) - 1 ), 1 );
 		}
 
 		/**
 		 * Filters the randomly-generated password.
 		 *
 		 * @since 3.0.0
 		 * @since 5.3.0 Added the `$length`, `$special_chars`, and `$extra_special_chars` parameters.
 		 *
 		 * @param string $password            The generated password.
 		 * @param int    $length              The length of password to generate.
 		 * @param bool   $special_chars       Whether to include standard special characters.
 		 * @param bool   $extra_special_chars Whether to include other special characters.
 		 */
 		return apply_filters( 'random_password', $password, $length, $special_chars, $extra_special_chars );
 	}
 endif;
 
 if ( ! function_exists( 'wp_rand' ) ) :
 	/**
 	 * Generates a random number.
 	 *
 	 * @since 2.6.2
 	 * @since 4.4.0 Uses PHP7 random_int() or the random_compat library if available.
 	 *
 	 * @global string $rnd_value
 	 *
 	 * @param int $min Lower limit for the generated number
 	 * @param int $max Upper limit for the generated number
 	 * @return int A random number between min and max
 	 */
 	function wp_rand( $min = 0, $max = 0 ) {
 		global $rnd_value;
 
 		// Some misconfigured 32-bit environments (Entropy PHP, for example)
 		// truncate integers larger than PHP_INT_MAX to PHP_INT_MAX rather than overflowing them to floats.
 		$max_random_number = 3000000000 === 2147483647 ? (float) '4294967295' : 4294967295; // 4294967295 = 0xffffffff
 
 		// We only handle ints, floats are truncated to their integer value.
 		$min = (int) $min;
 		$max = (int) $max;
 
 		// Use PHP's CSPRNG, or a compatible method.
 		static $use_random_int_functionality = true;
 		if ( $use_random_int_functionality ) {
 			try {
 				$_max = ( 0 != $max ) ? $max : $max_random_number;
 				// wp_rand() can accept arguments in either order, PHP cannot.
 				$_max = max( $min, $_max );
 				$_min = min( $min, $_max );
 				$val  = random_int( $_min, $_max );
 				if ( false !== $val ) {
 					return absint( $val );
 				} else {
 					$use_random_int_functionality = false;
 				}
 			} catch ( Error $e ) {
 				$use_random_int_functionality = false;
 			} catch ( Exception $e ) {
 				$use_random_int_functionality = false;
 			}
 		}
 
 		// Reset $rnd_value after 14 uses.
 		// 32 (md5) + 40 (sha1) + 40 (sha1) / 8 = 14 random numbers from $rnd_value.
 		if ( strlen( $rnd_value ) < 8 ) {
 			if ( defined( 'WP_SETUP_CONFIG' ) ) {
 				static $seed = '';
 			} else {
 				$seed = get_transient( 'random_seed' );
 			}
 			$rnd_value  = md5( uniqid( microtime() . mt_rand(), true ) . $seed );
 			$rnd_value .= sha1( $rnd_value );
 			$rnd_value .= sha1( $rnd_value . $seed );
 			$seed       = md5( $seed . $rnd_value );
 			if ( ! defined( 'WP_SETUP_CONFIG' ) && ! defined( 'WP_INSTALLING' ) ) {
 				set_transient( 'random_seed', $seed );
 			}
 		}
 
 		// Take the first 8 digits for our value.
 		$value = substr( $rnd_value, 0, 8 );
 
 		// Strip the first eight, leaving the remainder for the next call to wp_rand().
 		$rnd_value = substr( $rnd_value, 8 );
 
 		$value = abs( hexdec( $value ) );
 
 		// Reduce the value to be within the min - max range.
 		if ( 0 != $max ) {
 			$value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 );
 		}
 
 		return abs( (int) $value );
 	}
 endif;
 
 if ( ! function_exists( 'wp_set_password' ) ) :
 	/**
 	 * Updates the user's password with a new encrypted one.
 	 *
 	 * For integration with other applications, this function can be overwritten to
 	 * instead use the other package password checking algorithm.
 	 *
 	 * Please note: This function should be used sparingly and is really only meant for single-time
 	 * application. Leveraging this improperly in a plugin or theme could result in an endless loop
 	 * of password resets if precautions are not taken to ensure it does not execute on every page load.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
 	 * @param string $password The plaintext new user password
 	 * @param int    $user_id  User ID
 	 */
 	function wp_set_password( $password, $user_id ) {
 		global $wpdb;
 
 		$hash = wp_hash_password( $password );
 		$wpdb->update(
 			$wpdb->users,
 			array(
 				'user_pass'           => $hash,
 				'user_activation_key' => '',
 			),
 			array( 'ID' => $user_id )
 		);
 
 		clean_user_cache( $user_id );
 	}
 endif;
 
 if ( ! function_exists( 'get_avatar' ) ) :
 	/**
 	 * Retrieve the avatar `<img>` tag for a user, email address, MD5 hash, comment, or post.
 	 *
 	 * @since 2.5.0
 	 * @since 4.2.0 Optional `$args` parameter added.
 	 *
 	 * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
 	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
 	 * @param int    $size        Optional. Height and width of the avatar image file in pixels. Default 96.
 	 * @param string $default     Optional. URL for the default image or a default type. Accepts '404'
 	 *                            (return a 404 instead of a default image), 'retro' (8bit), 'monsterid'
 	 *                            (monster), 'wavatar' (cartoon face), 'indenticon' (the "quilt"),
 	 *                            'mystery', 'mm', or 'mysteryman' (The Oyster Man), 'blank' (transparent GIF),
 	 *                            or 'gravatar_default' (the Gravatar logo). Default is the value of the
 	 *                            'avatar_default' option, with a fallback of 'mystery'.
 	 * @param string $alt         Optional. Alternative text to use in img tag. Default empty.
 	 * @param array  $args {
 	 *     Optional. Extra arguments to retrieve the avatar.
 	 *
 	 *     @type int          $height        Display height of the avatar in pixels. Defaults to $size.
 	 *     @type int          $width         Display width of the avatar in pixels. Defaults to $size.
 	 *     @type bool         $force_default Whether to always show the default image, never the Gravatar. Default false.
 	 *     @type string       $rating        What rating to display avatars up to. Accepts 'G', 'PG', 'R', 'X', and are
 	 *                                       judged in that order. Default is the value of the 'avatar_rating' option.
 	 *     @type string       $scheme        URL scheme to use. See set_url_scheme() for accepted values.
 	 *                                       Default null.
 	 *     @type array|string $class         Array or string of additional classes to add to the img element.
 	 *                                       Default null.
 	 *     @type bool         $force_display Whether to always show the avatar - ignores the show_avatars option.
 	 *                                       Default false.
 	 *     @type string       $loading       Value for the `loading` attribute.
 	 *                                       Default null.
 	 *     @type string       $extra_attr    HTML attributes to insert in the IMG element. Is not sanitized. Default empty.
 	 * }
 	 * @return string|false `<img>` tag for the user's avatar. False on failure.
 	 */
 	function get_avatar( $id_or_email, $size = 96, $default = '', $alt = '', $args = null ) {
 		$defaults = array(
 			// get_avatar_data() args.
 			'size'          => 96,
 			'height'        => null,
 			'width'         => null,
 			'default'       => get_option( 'avatar_default', 'mystery' ),
 			'force_default' => false,
 			'rating'        => get_option( 'avatar_rating' ),
 			'scheme'        => null,
 			'alt'           => '',
 			'class'         => null,
 			'force_display' => false,
 			'loading'       => null,
 			'extra_attr'    => '',
 		);
 
 		if ( wp_lazy_loading_enabled( 'img', 'get_avatar' ) ) {
 			$defaults['loading'] = 'lazy';
 		}
 
 		if ( empty( $args ) ) {
 			$args = array();
 		}
 
 		$args['size']    = (int) $size;
 		$args['default'] = $default;
 		$args['alt']     = $alt;
 
 		$args = wp_parse_args( $args, $defaults );
 
 		if ( empty( $args['height'] ) ) {
 			$args['height'] = $args['size'];
 		}
 		if ( empty( $args['width'] ) ) {
 			$args['width'] = $args['size'];
 		}
 
 		if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
 			$id_or_email = get_comment( $id_or_email );
 		}
 
 		/**
 		 * Allows the HTML for a user's avatar to be returned early.
 		 *
 		 * Passing a non-null value will effectively short-circuit get_avatar(), passing
 		 * the value through the {@see 'get_avatar'} filter and returning early.
 		 *
 		 * @since 4.2.0
 		 *
 		 * @param string|null $avatar      HTML for the user's avatar. Default null.
 		 * @param mixed       $id_or_email The avatar to retrieve. Accepts a user_id, Gravatar MD5 hash,
 		 *                                 user email, WP_User object, WP_Post object, or WP_Comment object.
 		 * @param array       $args        Arguments passed to get_avatar_url(), after processing.
 		 */
 		$avatar = apply_filters( 'pre_get_avatar', null, $id_or_email, $args );
 
 		if ( ! is_null( $avatar ) ) {
 			/** This filter is documented in wp-includes/pluggable.php */
 			return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
 		}
 
 		if ( ! $args['force_display'] && ! get_option( 'show_avatars' ) ) {
 			return false;
 		}
 
 		$url2x = get_avatar_url( $id_or_email, array_merge( $args, array( 'size' => $args['size'] * 2 ) ) );
 
 		$args = get_avatar_data( $id_or_email, $args );
 
 		$url = $args['url'];
 
 		if ( ! $url || is_wp_error( $url ) ) {
 			return false;
 		}
 
 		$class = array( 'avatar', 'avatar-' . (int) $args['size'], 'photo' );
 
 		if ( ! $args['found_avatar'] || $args['force_default'] ) {
 			$class[] = 'avatar-default';
 		}
 
 		if ( $args['class'] ) {
 			if ( is_array( $args['class'] ) ) {
 				$class = array_merge( $class, $args['class'] );
 			} else {
 				$class[] = $args['class'];
 			}
 		}
 
 		// Add `loading` attribute.
 		$extra_attr = $args['extra_attr'];
 		$loading    = $args['loading'];
 
 		if ( in_array( $loading, array( 'lazy', 'eager' ), true ) && ! preg_match( '/\bloading\s*=/', $extra_attr ) ) {
 			if ( ! empty( $extra_attr ) ) {
 				$extra_attr .= ' ';
 			}
 
 			$extra_attr .= "loading='{$loading}'";
 		}
 
 		$avatar = sprintf(
 			"<img alt='%s' src='%s' srcset='%s' class='%s' height='%d' width='%d' %s/>",
 			esc_attr( $args['alt'] ),
 			esc_url( $url ),
 			esc_url( $url2x ) . ' 2x',
 			esc_attr( implode( ' ', $class ) ),
 			(int) $args['height'],
 			(int) $args['width'],
 			$extra_attr
 		);
 
 		/**
 		 * Filters the HTML for a user's avatar.
 		 *
 		 * @since 2.5.0
 		 * @since 4.2.0 The `$args` parameter was added.
 		 *
 		 * @param string $avatar      HTML for the user's avatar.
 		 * @param mixed  $id_or_email The avatar to retrieve. Accepts a user_id, Gravatar MD5 hash,
 		 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
 		 * @param int    $size        Square avatar width and height in pixels to retrieve.
 		 * @param string $default     URL for the default image or a default type. Accepts '404', 'retro', 'monsterid',
 		 *                            'wavatar', 'indenticon', 'mystery', 'mm', 'mysteryman', 'blank', or 'gravatar_default'.
 		 *                            Default is the value of the 'avatar_default' option, with a fallback of 'mystery'.
 		 * @param string $alt         Alternative text to use in the avatar image tag. Default empty.
 		 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
 		 */
 		return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
 	}
 endif;
 
 if ( ! function_exists( 'wp_text_diff' ) ) :
 	/**
 	 * Displays a human readable HTML representation of the difference between two strings.
 	 *
 	 * The Diff is available for getting the changes between versions. The output is
 	 * HTML, so the primary use is for displaying the changes. If the two strings
 	 * are equivalent, then an empty string will be returned.
 	 *
 	 * @since 2.6.0
 	 *
 	 * @see wp_parse_args() Used to change defaults to user defined settings.
 	 * @uses Text_Diff
 	 * @uses WP_Text_Diff_Renderer_Table
 	 *
 	 * @param string       $left_string  "old" (left) version of string
 	 * @param string       $right_string "new" (right) version of string
 	 * @param string|array $args {
 	 *     Associative array of options to pass to WP_Text_Diff_Renderer_Table().
 	 *
 	 *     @type string $title           Titles the diff in a manner compatible
 	 *                                   with the output. Default empty.
 	 *     @type string $title_left      Change the HTML to the left of the title.
 	 *                                   Default empty.
 	 *     @type string $title_right     Change the HTML to the right of the title.
 	 *                                   Default empty.
 	 *     @type bool   $show_split_view True for split view (two columns), false for
 	 *                                   un-split view (single column). Default true.
 	 * }
 	 * @return string Empty string if strings are equivalent or HTML with differences.
 	 */
 	function wp_text_diff( $left_string, $right_string, $args = null ) {
 		$defaults = array(
 			'title'           => '',
 			'title_left'      => '',
 			'title_right'     => '',
 			'show_split_view' => true,
 		);
 		$args     = wp_parse_args( $args, $defaults );
 
 		if ( ! class_exists( 'WP_Text_Diff_Renderer_Table', false ) ) {
 			require ABSPATH . WPINC . '/wp-diff.php';
 		}
 
 		$left_string  = normalize_whitespace( $left_string );
 		$right_string = normalize_whitespace( $right_string );
 
 		$left_lines  = explode( "\n", $left_string );
 		$right_lines = explode( "\n", $right_string );
 		$text_diff   = new Text_Diff( $left_lines, $right_lines );
 		$renderer    = new WP_Text_Diff_Renderer_Table( $args );
 		$diff        = $renderer->render( $text_diff );
 
 		if ( ! $diff ) {
 			return '';
 		}
 
 		$is_split_view       = ! empty( $args['show_split_view'] );
 		$is_split_view_class = $is_split_view ? ' is-split-view' : '';
 
 		$r = "<table class='diff$is_split_view_class'>\n";
 
 		if ( $args['title'] ) {
 			$r .= "<caption class='diff-title'>$args[title]</caption>\n";
 		}
 
 		if ( $args['title_left'] || $args['title_right'] ) {
 			$r .= '<thead>';
 		}
 
 		if ( $args['title_left'] || $args['title_right'] ) {
 			$th_or_td_left  = empty( $args['title_left'] ) ? 'td' : 'th';
 			$th_or_td_right = empty( $args['title_right'] ) ? 'td' : 'th';
 
 			$r .= "<tr class='diff-sub-title'>\n";
 			$r .= "\t<$th_or_td_left>$args[title_left]</$th_or_td_left>\n";
 			if ( $is_split_view ) {
 				$r .= "\t<$th_or_td_right>$args[title_right]</$th_or_td_right>\n";
 			}
 			$r .= "</tr>\n";
 		}
 
 		if ( $args['title_left'] || $args['title_right'] ) {
 			$r .= "</thead>\n";
 		}
 
 		$r .= "<tbody>\n$diff\n</tbody>\n";
 		$r .= '</table>';
 
 		return $r;
 	}
 endif;