', __( 'Please contact your host for assistance with investigating this issue further.' ) );

		/**
		 * Filters the debug information included in the fatal error protection email.
		 *
		 * @since 5.3.0
		 *
		 * @param array $message An associative array of debug information.
		 */
		$debug = apply_filters( 'recovery_email_debug_info', $this->get_debug( $extension ) );

		/* translators: Do not translate LINK, EXPIRES, CAUSE, DETAILS, SITEURL, PAGEURL, SUPPORT. DEBUG: those are placeholders. */
		$message = __(
			'Howdy!

WordPress has a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.
###CAUSE###
First, visit your website (###SITEURL###) and check for any visible issues. Next, visit the page where the error was caught (###PAGEURL###) and check for any visible issues.

###SUPPORT###

If your site appears broken and you can\'t access your dashboard normally, WordPress now has a special "recovery mode". This lets you safely login to your dashboard and investigate further.

###LINK###

To keep your site safe, this link will expire in ###EXPIRES###. Don\'t worry about that, though: a new link will be emailed to you if the error occurs again after it expires.

When seeking help with this issue, you may be asked for some of the following information:
###DEBUG###

###DETAILS###'
		);
		$message = str_replace(
			array(
				'###LINK###',
				'###EXPIRES###',
				'###CAUSE###',
				'###DETAILS###',
				'###SITEURL###',
				'###PAGEURL###',
				'###SUPPORT###',
				'###DEBUG###',
			),
			array(
				$url,
				human_time_diff( time() + $rate_limit ),
				$cause ? "\n{$cause}\n" : "\n",
				$details,
				home_url( '/' ),
				home_url( $_SERVER['REQUEST_URI'] ),
				$support,
				implode( "\r\n", $debug ),
			),
			$message
		);

		$email = array(
			'to'          => $this->get_recovery_mode_email_address(),
			/* translators: %s: Site title. */
			'subject'     => __( '[%s] Your Site is Experiencing a Technical Issue' ),
			'message'     => $message,
			'headers'     => '',
			'attachments' => '',
		);

		/**
		 * Filters the contents of the Recovery Mode email.
		 *
		 * @since 5.2.0
		 * @since 5.6.0 The `$email` argument includes the `attachments` key.
		 *
		 * @param array  $email {
		 *     Used to build a call to wp_mail().
		 *
		 *     @type string|array $to          Array or comma-separated list of email addresses to send message.
		 *     @type string       $subject     Email subject
		 *     @type string       $message     Message contents
		 *     @type string|array $headers     Optional. Additional headers.
		 *     @type string|array $attachments Optional. Files to attach.
		 * }
		 * @param string $url   URL to enter recovery mode.
		 */
		$email = apply_filters( 'recovery_mode_email', $email, $url );

		$sent = wp_mail(
			$email['to'],
			wp_specialchars_decode( sprintf( $email['subject'], $blogname ) ),
			$email['message'],
			$email['headers'],
			$email['attachments']
		);

		if ( $switched_locale ) {
			restore_previous_locale();
		}

		return $sent;
	}

	/**
	 * Gets the email address to send the recovery mode link to.
	 *
	 * @since 5.2.0
	 *
	 * @return string Email address to send recovery mode link to.
	 */
	private function get_recovery_mode_email_address() {
		if ( defined( 'RECOVERY_MODE_EMAIL' ) && is_email( RECOVERY_MODE_EMAIL ) ) {
			return RECOVERY_MODE_EMAIL;
		}

		return get_option( 'admin_email' );
	}

	/**
	 * Gets the description indicating the possible cause for the error.
	 *
	 * @since 5.2.0
	 *
	 * @param array $extension {
	 *     The extension that caused the error.
	 *
	 *     @type string $slug The extension slug. The directory of the plugin or theme.
	 *     @type string $type The extension type. Either 'plugin' or 'theme'.
	 * }
	 * @return string Message about which extension caused the error.
	 */
	private function get_cause( $extension ) {

		if ( 'plugin' === $extension['type'] ) {
			$plugin = $this->get_plugin( $extension );

			if ( false === $plugin ) {
				$name = $extension['slug'];
			} else {
				$name = $plugin['Name'];
			}

			/* translators: %s: Plugin name. */
			$cause = sprintf( __( 'In this case, WordPress caught an error with one of your plugins, %s.' ), $name );
		} else {
			$theme = wp_get_theme( $extension['slug'] );
			$name  = $theme->exists() ? $theme->display( 'Name' ) : $extension['slug'];

			/* translators: %s: Theme name. */
			$cause = sprintf( __( 'In this case, WordPress caught an error with your theme, %s.' ), $name );
		}

		return $cause;
	}

	/**
	 * Return the details for a single plugin based on the extension data from an error.
	 *
	 * @since 5.3.0
	 *
	 * @param array $extension {
	 *     The extension that caused the error.
	 *
	 *     @type string $slug The extension slug. The directory of the plugin or theme.
	 *     @type string $type The extension type. Either 'plugin' or 'theme'.
	 * }
	 * @return array|false A plugin array {@see get_plugins()} or `false` if no plugin was found.
	 */
	private function get_plugin( $extension ) {
		if ( ! function_exists( 'get_plugins' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		$plugins = get_plugins();

		// Assume plugin main file name first since it is a common convention.
		if ( isset( $plugins[ "{$extension['slug']}/{$extension['slug']}.php" ] ) ) {
			return $plugins[ "{$extension['slug']}/{$extension['slug']}.php" ];
		} else {
			foreach ( $plugins as $file => $plugin_data ) {
				if ( str_starts_with( $file, "{$extension['slug']}/" ) || $file === $extension['slug'] ) {
					return $plugin_data;
				}
			}
		}

		return false;
	}

	/**
	 * Return debug information in an easy to manipulate format.
	 *
	 * @since 5.3.0
	 *
	 * @param array $extension {
	 *     The extension that caused the error.
	 *
	 *     @type string $slug The extension slug. The directory of the plugin or theme.
	 *     @type string $type The extension type. Either 'plugin' or 'theme'.
	 * }
	 * @return array An associative array of debug information.
	 */
	private function get_debug( $extension ) {
		$theme      = wp_get_theme();
		$wp_version = get_bloginfo( 'version' );

		if ( $extension ) {
			$plugin = $this->get_plugin( $extension );
		} else {
			$plugin = null;
		}

		$debug = array(
			'wp'    => sprintf(
				/* translators: %s: Current WordPress version number. */
				__( 'WordPress version %s' ),
				$wp_version
			),
			'theme' => sprintf(
				/* translators: 1: Current active theme name. 2: Current active theme version. */
				__( 'Active theme: %1$s (version %2$s)' ),
				$theme->get( 'Name' ),
				$theme->get( 'Version' )
			),
		);

		if ( null !== $plugin ) {
			$debug['plugin'] = sprintf(
				/* translators: 1: The failing plugins name. 2: The failing plugins version. */
				__( 'Current plugin: %1$s (version %2$s)' ),
				$plugin['Name'],
				$plugin['Version']
			);
		}

		$debug['php'] = sprintf(
			/* translators: %s: The currently used PHP version. */
			__( 'PHP version %s' ),
			PHP_VERSION
		);

		return $debug;
	}
}
on wp_restore_post_revision( $revision, $fields = null ) {
	$revision = wp_get_post_revision( $revision, ARRAY_A );

	if ( ! $revision ) {
		return $revision;
	}

	if ( ! is_array( $fields ) ) {
		$fields = array_keys( _wp_post_revision_fields( $revision ) );
	}

	$update = array();
	foreach ( array_intersect( array_keys( $revision ), $fields ) as $field ) {
		$update[ $field ] = $revision[ $field ];
	}

	if ( ! $update ) {
		return false;
	}

	$update['ID'] = $revision['post_parent'];

	$update = wp_slash( $update ); // Since data is from DB.

	$post_id = wp_update_post( $update );

	if ( ! $post_id || is_wp_error( $post_id ) ) {
		return $post_id;
	}

	// Update last edit user.
	update_post_meta( $post_id, '_edit_last', get_current_user_id() );

	/**
	 * Fires after a post revision has been restored.
	 *
	 * @since 2.6.0
	 *
	 * @param int $post_id     Post ID.
	 * @param int $revision_id Post revision ID.
	 */
	do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] );

	return $post_id;
}

/**
 * Deletes a revision.
 *
 * Deletes the row from the posts table corresponding to the specified revision.
 *
 * @since 2.6.0
 *
 * @param int|WP_Post $revision Revision ID or revision object.
 * @return WP_Post|false|null Null or false if error, deleted post object if success.
 */
function wp_delete_post_revision( $revision ) {
	$revision = wp_get_post_revision( $revision );

	if ( ! $revision ) {
		return $revision;
	}

	$delete = wp_delete_post( $revision->ID );

	if ( $delete ) {
		/**
		 * Fires once a post revision has been deleted.
		 *
		 * @since 2.6.0
		 *
		 * @param int     $revision_id Post revision ID.
		 * @param WP_Post $revision    Post revision object.
		 */
		do_action( 'wp_delete_post_revision', $revision->ID, $revision );
	}

	return $delete;
}

/**
 * Returns all revisions of specified post.
 *
 * @since 2.6.0
 *
 * @see get_children()
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @param array|null  $args Optional. Arguments for retrieving post revisions. Default null.
 * @return WP_Post[]|int[] Array of revision objects or IDs, or an empty array if none.
 */
function wp_get_post_revisions( $post = 0, $args = null ) {
	$post = get_post( $post );

	if ( ! $post || empty( $post->ID ) ) {
		return array();
	}

	$defaults = array(
		'order'         => 'DESC',
		'orderby'       => 'date ID',
		'check_enabled' => true,
	);
	$args     = wp_parse_args( $args, $defaults );

	if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) ) {
		return array();
	}

	$args = array_merge(
		$args,
		array(
			'post_parent' => $post->ID,
			'post_type'   => 'revision',
			'post_status' => 'inherit',
		)
	);

	$revisions = get_children( $args );

	if ( ! $revisions ) {
		return array();
	}

	return $revisions;
}

/**
 * Returns the latest revision ID and count of revisions for a post.
 *
 * @since 6.1.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return array|WP_Error {
 *     Returns associative array with latest revision ID and total count,
 *     or a WP_Error if the post does not exist or revisions are not enabled.
 *
 *     @type int $latest_id The latest revision post ID or 0 if no revisions exist.
 *     @type int $count     The total count of revisions for the given post.
 * }
 */
function wp_get_latest_revision_id_and_total_count( $post = 0 ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return new WP_Error( 'invalid_post', __( 'Invalid post.' ) );
	}

	if ( ! wp_revisions_enabled( $post ) ) {
		return new WP_Error( 'revisions_not_enabled', __( 'Revisions not enabled.' ) );
	}

	$args = array(
		'post_parent'         => $post->ID,
		'fields'              => 'ids',
		'post_type'           => 'revision',
		'post_status'         => 'inherit',
		'order'               => 'DESC',
		'orderby'             => 'date ID',
		'posts_per_page'      => 1,
		'ignore_sticky_posts' => true,
	);

	$revision_query = new WP_Query();
	$revisions      = $revision_query->query( $args );

	if ( ! $revisions ) {
		return array(
			'latest_id' => 0,
			'count'     => 0,
		);
	}

	return array(
		'latest_id' => $revisions[0],
		'count'     => $revision_query->found_posts,
	);
}

/**
 * Returns the url for viewing and potentially restoring revisions of a given post.
 *
 * @since 5.9.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return string|null The URL for editing revisions on the given post, otherwise null.
 */
function wp_get_post_revisions_url( $post = 0 ) {
	$post = get_post( $post );

	if ( ! $post instanceof WP_Post ) {
		return null;
	}

	// If the post is a revision, return early.
	if ( 'revision' === $post->post_type ) {
		return get_edit_post_link( $post );
	}

	if ( ! wp_revisions_enabled( $post ) ) {
		return null;
	}

	$revisions = wp_get_latest_revision_id_and_total_count( $post->ID );

	if ( is_wp_error( $revisions ) || 0 === $revisions['count'] ) {
		return null;
	}

	return get_edit_post_link( $revisions['latest_id'] );
}

/**
 * Determines whether revisions are enabled for a given post.
 *
 * @since 3.6.0
 *
 * @param WP_Post $post The post object.
 * @return bool True if number of revisions to keep isn't zero, false otherwise.
 */
function wp_revisions_enabled( $post ) {
	return wp_revisions_to_keep( $post ) !== 0;
}

/**
 * Determines how many revisions to retain for a given post.
 *
 * By default, an infinite number of revisions are kept.
 *
 * The constant WP_POST_REVISIONS can be set in wp-config to specify the limit
 * of revisions to keep.
 *
 * @since 3.6.0
 *
 * @param WP_Post $post The post object.
 * @return int The number of revisions to keep.
 */
function wp_revisions_to_keep( $post ) {
	$num = WP_POST_REVISIONS;

	if ( true === $num ) {
		$num = -1;
	} else {
		$num = (int) $num;
	}

	if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {
		$num = 0;
	}

	/**
	 * Filters the number of revisions to save for the given post.
	 *
	 * Overrides the value of WP_POST_REVISIONS.
	 *
	 * @since 3.6.0
	 *
	 * @param int     $num  Number of revisions to store.
	 * @param WP_Post $post Post object.
	 */
	$num = apply_filters( 'wp_revisions_to_keep', $num, $post );

	/**
	 * Filters the number of revisions to save for the given post by its post type.
	 *
	 * Overrides both the value of WP_POST_REVISIONS and the {@see 'wp_revisions_to_keep'} filter.
	 *
	 * The dynamic portion of the hook name, `$post->post_type`, refers to
	 * the post type slug.
	 *
	 * Possible hook names include:
	 *
	 *  - `wp_post_revisions_to_keep`
	 *  - `wp_page_revisions_to_keep`
	 *
	 * @since 5.8.0
	 *
	 * @param int     $num  Number of revisions to store.
	 * @param WP_Post $post Post object.
	 */
	$num = apply_filters( "wp_{$post->post_type}_revisions_to_keep", $num, $post );

	return (int) $num;
}

/**
 * Sets up the post object for preview based on the post autosave.
 *
 * @since 2.7.0
 * @access private
 *
 * @param WP_Post $post
 * @return WP_Post|false
 */
function _set_preview( $post ) {
	if ( ! is_object( $post ) ) {
		return $post;
	}

	$preview = wp_get_post_autosave( $post->ID );

	if ( is_object( $preview ) ) {
		$preview = sanitize_post( $preview );

		$post->post_content = $preview->post_content;
		$post->post_title   = $preview->post_title;
		$post->post_excerpt = $preview->post_excerpt;
	}

	add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 );
	add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 );

	return $post;
}

/**
 * Filters the latest content for preview from the post autosave.
 *
 * @since 2.7.0
 * @access private
 */
function _show_post_preview() {
	if ( isset( $_GET['preview_id'] ) && isset( $_GET['preview_nonce'] ) ) {
		$id = (int) $_GET['preview_id'];

		if ( false === wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) ) {
			wp_die( __( 'Sorry, you are not allowed to preview drafts.' ), 403 );
		}

		add_filter( 'the_preview', '_set_preview' );
	}
}

/**
 * Filters terms lookup to set the post format.
 *
 * @since 3.6.0
 * @access private
 *
 * @param array  $terms
 * @param int    $post_id
 * @param string $taxonomy
 * @return array
 */
function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) {
	$post = get_post();

	if ( ! $post ) {
		return $terms;
	}

	if ( empty( $_REQUEST['post_format'] ) || $post->ID != $post_id
		|| 'post_format' !== $taxonomy || 'revision' === $post->post_type
	) {
		return $terms;
	}

	if ( 'standard' === $_REQUEST['post_format'] ) {
		$terms = array();
	} else {
		$term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' );
		if ( $term ) {
			$terms = array( $term ); // Can only have one post format.
		}
	}

	return $terms;
}

/**
 * Filters post thumbnail lookup to set the post thumbnail.
 *
 * @since 4.6.0
 * @access private
 *
 * @param null|array|string $value    The value to return - a single metadata value, or an array of values.
 * @param int               $post_id  Post ID.
 * @param string            $meta_key Meta key.
 * @return null|array The default return value or the post thumbnail meta array.
 */
function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) {
	$post = get_post();

	if ( ! $post ) {
		return $value;
	}

	if ( empty( $_REQUEST['_thumbnail_id'] ) ||
		empty( $_REQUEST['preview_id'] ) ||
		$post->ID != $post_id ||
		'_thumbnail_id' !== $meta_key ||
		'revision' === $post->post_type ||
		$post_id != $_REQUEST['preview_id'] ) {

		return $value;
	}

	$thumbnail_id = (int) $_REQUEST['_thumbnail_id'];

	if ( $thumbnail_id <= 0 ) {
		return '';
	}

	return (string) $thumbnail_id;
}

/**
 * Gets the post revision version.
 *
 * @since 3.6.0
 * @access private
 *
 * @param WP_Post $revision
 * @return int|false
 */
function _wp_get_post_revision_version( $revision ) {
	if ( is_object( $revision ) ) {
		$revision = get_object_vars( $revision );
	} elseif ( ! is_array( $revision ) ) {
		return false;
	}

	if ( preg_match( '/^\d+-(?:autosave|revision)-v(\d+)$/', $revision['post_name'], $matches ) ) {
		return (int) $matches[1];
	}

	return 0;
}

/**
 * Upgrades the revisions author, adds the current post as a revision and sets the revisions version to 1.
 *
 * @since 3.6.0
 * @access private
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param WP_Post $post      Post object.
 * @param array   $revisions Current revisions of the post.
 * @return bool true if the revisions were upgraded, false if problems.
 */
function _wp_upgrade_revisions_of_post( $post, $revisions ) {
	global $wpdb;

	// Add post option exclusively.
	$lock   = "revision-upgrade-{$post->ID}";
	$now    = time();
	$result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'no') /* LOCK */", $lock, $now ) );

	if ( ! $result ) {
		// If we couldn't get a lock, see how old the previous lock is.
		$locked = get_option( $lock );

		if ( ! $locked ) {
			/*
			 * Can't write to the lock, and can't read the lock.
			 * Something broken has happened.
			 */
			return false;
		}

		if ( $locked > $now - HOUR_IN_SECONDS ) {
			// Lock is not too old: some other process may be upgrading this post. Bail.
			return false;
		}

		// Lock is too old - update it (below) and continue.
	}

	// If we could get a lock, re-"add" the option to fire all the correct filters.
	update_option( $lock, $now );

	reset( $revisions );
	$add_last = true;

	do {
		$this_revision = current( $revisions );
		$prev_revision = next( $revisions );

		$this_revision_version = _wp_get_post_revision_version( $this_revision );

		// Something terrible happened.
		if ( false === $this_revision_version ) {
			continue;
		}

		/*
		 * 1 is the latest revision version, so we're already up to date.
		 * No need to add a copy of the post as latest revision.
		 */
		if ( 0 < $this_revision_version ) {
			$add_last = false;
			continue;
		}

		// Always update the revision version.
		$update = array(
			'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ),
		);

		/*
		 * If this revision is the oldest revision of the post, i.e. no $prev_revision,
		 * the correct post_author is probably $post->post_author, but that's only a good guess.
		 * Update the revision version only and Leave the author as-is.
		 */
		if ( $prev_revision ) {
			$prev_revision_version = _wp_get_post_revision_version( $prev_revision );

			// If the previous revision is already up to date, it no longer has the information we need :(
			if ( $prev_revision_version < 1 ) {
				$update['post_author'] = $prev_revision->post_author;
			}
		}

		// Upgrade this revision.
		$result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) );

		if ( $result ) {
			wp_cache_delete( $this_revision->ID, 'posts' );
		}
	} while ( $prev_revision );

	delete_option( $lock );

	// Add a copy of the post as latest revision.
	if ( $add_last ) {
		wp_save_post_revision( $post->ID );
	}

	return true;
}
a ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$options = $this->get_registered_options();

		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => 'settings',
			'type'       => 'object',
			'properties' => array(),
		);

		foreach ( $options as $option_name => $option ) {
			$schema['properties'][ $option_name ]                = $option['schema'];
			$schema['properties'][ $option_name ]['arg_options'] = array(
				'sanitize_callback' => array( $this, 'sanitize_callback' ),
			);
		}

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}

	/**
	 * Custom sanitize callback used for all options to allow the use of 'null'.
	 *
	 * By default, the schema of settings will throw an error if a value is set to
	 * `null` as it's not a valid value for something like "type => string". We
	 * provide a wrapper sanitizer to allow the use of `null`.
	 *
	 * @since 4.7.0
	 *
	 * @param mixed           $value   The value for the setting.
	 * @param WP_REST_Request $request The request object.
	 * @param string          $param   The parameter name.
	 * @return mixed|WP_Error
	 */
	public function sanitize_callback( $value, $request, $param ) {
		if ( is_null( $value ) ) {
			return $value;
		}

		return rest_parse_request_arg( $value, $request, $param );
	}

	/**
	 * Recursively add additionalProperties = false to all objects in a schema
	 * if no additionalProperties setting is specified.
	 *
	 * This is needed to restrict properties of objects in settings values to only
	 * registered items, as the REST API will allow additional properties by
	 * default.
	 *
	 * @since 4.9.0
	 * @deprecated 6.1.0 Use {@see rest_default_additional_properties_to_false()} instead.
	 *
	 * @param array $schema The schema array.
	 * @return array
	 */
	protected function set_additional_properties_to_false( $schema ) {
		_deprecated_function( __METHOD__, '6.1.0', 'rest_default_additional_properties_to_false()' );

		return rest_default_additional_properties_to_false( $schema );
	}
}