source: tags/5.2.1/src/wp-admin/includes/plugin.php

<?php
/**
 * WordPress Plugin Administration API
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Parses the plugin contents to retrieve plugin's metadata.
 *
 * The metadata of the plugin's data searches for the following in the plugin's
 * header. All plugin data must be on its own line. For plugin description, it
 * must not have any newlines or only parts of the description will be displayed
 * and the same goes for the plugin data. The below is formatted for printing.
 *
 *     /*
 *     Plugin Name: Name of Plugin
 *     Plugin URI: Link to plugin information
 *     Description: Plugin Description
 *     Author: Plugin author's name
 *     Author URI: Link to the author's web site
 *     Version: Must be set in the plugin for WordPress 2.3+
 *     Text Domain: Optional. Unique identifier, should be same as the one used in
 *          load_plugin_textdomain()
 *     Domain Path: Optional. Only useful if the translations are located in a
 *          folder above the plugin's base path. For example, if .mo files are
 *          located in the locale folder then Domain Path will be "/locale/" and
 *          must have the first slash. Defaults to the base folder the plugin is
 *          located in.
 *     Network: Optional. Specify "Network: true" to require that a plugin is activated
 *          across all sites in an installation. This will prevent a plugin from being
 *          activated on a single site when Multisite is enabled.
 *      * / # Remove the space to close comment
 *
 * Some users have issues with opening large files and manipulating the contents
 * for want is usually the first 1kiB or 2kiB. This function stops pulling in
 * the plugin contents when it has all of the required plugin data.
 *
 * The first 8kiB of the file will be pulled in and if the plugin data is not
 * within that first 8kiB, then the plugin author should correct their plugin
 * and move the plugin data headers to the top.
 *
 * The plugin file is assumed to have permissions to allow for scripts to read
 * the file. This is not checked however and the file is only opened for
 * reading.
 *
 * @since 1.5.0
 *
 * @param string $plugin_file Absolute path to the main plugin file.
 * @param bool   $markup      Optional. If the returned data should have HTML markup applied.
 *                            Default true.
 * @param bool   $translate   Optional. If the returned data should be translated. Default true.
 * @return array {
 *     Plugin data. Values will be empty if not supplied by the plugin.
 *
 *     @type string $Name        Name of the plugin. Should be unique.
 *     @type string $Title       Title of the plugin and link to the plugin's site (if set).
 *     @type string $Description Plugin description.
 *     @type string $Author      Author's name.
 *     @type string $AuthorURI   Author's website address (if set).
 *     @type string $Version     Plugin version.
 *     @type string $TextDomain  Plugin textdomain.
 *     @type string $DomainPath  Plugins relative directory path to .mo files.
 *     @type bool   $Network     Whether the plugin can only be activated network-wide.
 * }
 */
function get_plugin_data( $plugin_file, $markup = true, $translate = true ) {

        $default_headers = array(
                'Name'        => 'Plugin Name',
                'PluginURI'   => 'Plugin URI',
                'Version'     => 'Version',
                'Description' => 'Description',
                'Author'      => 'Author',
                'AuthorURI'   => 'Author URI',
                'TextDomain'  => 'Text Domain',
                'DomainPath'  => 'Domain Path',
                'Network'     => 'Network',
                // Site Wide Only is deprecated in favor of Network.
                '_sitewide'   => 'Site Wide Only',
        );

        $plugin_data = get_file_data( $plugin_file, $default_headers, 'plugin' );

        // Site Wide Only is the old header for Network
        if ( ! $plugin_data['Network'] && $plugin_data['_sitewide'] ) {
                /* translators: 1: Site Wide Only: true, 2: Network: true */
                _deprecated_argument( __FUNCTION__, '3.0.0', sprintf( __( 'The %1$s plugin header is deprecated. Use %2$s instead.' ), '<code>Site Wide Only: true</code>', '<code>Network: true</code>' ) );
                $plugin_data['Network'] = $plugin_data['_sitewide'];
        }
        $plugin_data['Network'] = ( 'true' == strtolower( $plugin_data['Network'] ) );
        unset( $plugin_data['_sitewide'] );

        // If no text domain is defined fall back to the plugin slug.
        if ( ! $plugin_data['TextDomain'] ) {
                $plugin_slug = dirname( plugin_basename( $plugin_file ) );
                if ( '.' !== $plugin_slug && false === strpos( $plugin_slug, '/' ) ) {
                        $plugin_data['TextDomain'] = $plugin_slug;
                }
        }

        if ( $markup || $translate ) {
                $plugin_data = _get_plugin_data_markup_translate( $plugin_file, $plugin_data, $markup, $translate );
        } else {
                $plugin_data['Title']      = $plugin_data['Name'];
                $plugin_data['AuthorName'] = $plugin_data['Author'];
        }

        return $plugin_data;
}

/**
 * Sanitizes plugin data, optionally adds markup, optionally translates.
 *
 * @since 2.7.0
 *
 * @see get_plugin_data()
 *
 * @access private
 *
 * @param string $plugin_file Path to the main plugin file.
 * @param array  $plugin_data An array of plugin data. See `get_plugin_data()`.
 * @param bool   $markup      Optional. If the returned data should have HTML markup applied.
 *                            Default true.
 * @param bool   $translate   Optional. If the returned data should be translated. Default true.
 * @return array {
 *     Plugin data. Values will be empty if not supplied by the plugin.
 *
 *     @type string $Name        Name of the plugin. Should be unique.
 *     @type string $Title       Title of the plugin and link to the plugin's site (if set).
 *     @type string $Description Plugin description.
 *     @type string $Author      Author's name.
 *     @type string $AuthorURI   Author's website address (if set).
 *     @type string $Version     Plugin version.
 *     @type string $TextDomain  Plugin textdomain.
 *     @type string $DomainPath  Plugins relative directory path to .mo files.
 *     @type bool   $Network     Whether the plugin can only be activated network-wide.
 * }
 */
function _get_plugin_data_markup_translate( $plugin_file, $plugin_data, $markup = true, $translate = true ) {

        // Sanitize the plugin filename to a WP_PLUGIN_DIR relative path
        $plugin_file = plugin_basename( $plugin_file );

        // Translate fields
        if ( $translate ) {
                if ( $textdomain = $plugin_data['TextDomain'] ) {
                        if ( ! is_textdomain_loaded( $textdomain ) ) {
                                if ( $plugin_data['DomainPath'] ) {
                                        load_plugin_textdomain( $textdomain, false, dirname( $plugin_file ) . $plugin_data['DomainPath'] );
                                } else {
                                        load_plugin_textdomain( $textdomain, false, dirname( $plugin_file ) );
                                }
                        }
                } elseif ( 'hello.php' == basename( $plugin_file ) ) {
                        $textdomain = 'default';
                }
                if ( $textdomain ) {
                        foreach ( array( 'Name', 'PluginURI', 'Description', 'Author', 'AuthorURI', 'Version' ) as $field ) {
                                // phpcs:ignore WordPress.WP.I18n.LowLevelTranslationFunction,WordPress.WP.I18n.NonSingularStringLiteralText,WordPress.WP.I18n.NonSingularStringLiteralDomain
                                $plugin_data[ $field ] = translate( $plugin_data[ $field ], $textdomain );
                        }
                }
        }

        // Sanitize fields
        $allowed_tags_in_links = array(
                'abbr'    => array( 'title' => true ),
                'acronym' => array( 'title' => true ),
                'code'    => true,
                'em'      => true,
                'strong'  => true,
        );

        $allowed_tags      = $allowed_tags_in_links;
        $allowed_tags['a'] = array(
                'href'  => true,
                'title' => true,
        );

        // Name is marked up inside <a> tags. Don't allow these.
        // Author is too, but some plugins have used <a> here (omitting Author URI).
        $plugin_data['Name']   = wp_kses( $plugin_data['Name'], $allowed_tags_in_links );
        $plugin_data['Author'] = wp_kses( $plugin_data['Author'], $allowed_tags );

        $plugin_data['Description'] = wp_kses( $plugin_data['Description'], $allowed_tags );
        $plugin_data['Version']     = wp_kses( $plugin_data['Version'], $allowed_tags );

        $plugin_data['PluginURI'] = esc_url( $plugin_data['PluginURI'] );
        $plugin_data['AuthorURI'] = esc_url( $plugin_data['AuthorURI'] );

        $plugin_data['Title']      = $plugin_data['Name'];
        $plugin_data['AuthorName'] = $plugin_data['Author'];

        // Apply markup
        if ( $markup ) {
                if ( $plugin_data['PluginURI'] && $plugin_data['Name'] ) {
                        $plugin_data['Title'] = '<a href="' . $plugin_data['PluginURI'] . '">' . $plugin_data['Name'] . '</a>';
                }

                if ( $plugin_data['AuthorURI'] && $plugin_data['Author'] ) {
                        $plugin_data['Author'] = '<a href="' . $plugin_data['AuthorURI'] . '">' . $plugin_data['Author'] . '</a>';
                }

                $plugin_data['Description'] = wptexturize( $plugin_data['Description'] );

                if ( $plugin_data['Author'] ) {
                        $plugin_data['Description'] .= ' <cite>' . sprintf( __( 'By %s.' ), $plugin_data['Author'] ) . '</cite>';
                }
        }

        return $plugin_data;
}

/**
 * Get a list of a plugin's files.
 *
 * @since 2.8.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return array List of files relative to the plugin root.
 */
function get_plugin_files( $plugin ) {
        $plugin_file = WP_PLUGIN_DIR . '/' . $plugin;
        $dir         = dirname( $plugin_file );

        $plugin_files = array( plugin_basename( $plugin_file ) );

        if ( is_dir( $dir ) && WP_PLUGIN_DIR !== $dir ) {

                /**
                 * Filters the array of excluded directories and files while scanning the folder.
                 *
                 * @since 4.9.0
                 *
                 * @param string[] $exclusions Array of excluded directories and files.
                 */
                $exclusions = (array) apply_filters( 'plugin_files_exclusions', array( 'CVS', 'node_modules', 'vendor', 'bower_components' ) );

                $list_files = list_files( $dir, 100, $exclusions );
                $list_files = array_map( 'plugin_basename', $list_files );

                $plugin_files = array_merge( $plugin_files, $list_files );
                $plugin_files = array_values( array_unique( $plugin_files ) );
        }

        return $plugin_files;
}

/**
 * Check the plugins directory and retrieve all plugin files with plugin data.
 *
 * WordPress only supports plugin files in the base plugins directory
 * (wp-content/plugins) and in one directory above the plugins directory
 * (wp-content/plugins/my-plugin). The file it looks for has the plugin data
 * and must be found in those two locations. It is recommended to keep your
 * plugin files in their own directories.
 *
 * The file with the plugin data is the file that will be included and therefore
 * needs to have the main execution for the plugin. This does not mean
 * everything must be contained in the file and it is recommended that the file
 * be split for maintainability. Keep everything in one file for extreme
 * optimization purposes.
 *
 * @since 1.5.0
 *
 * @param string $plugin_folder Optional. Relative path to single plugin folder.
 * @return array Key is the plugin file path and the value is an array of the plugin data.
 */
function get_plugins( $plugin_folder = '' ) {

        $cache_plugins = wp_cache_get( 'plugins', 'plugins' );
        if ( ! $cache_plugins ) {
                $cache_plugins = array();
        }

        if ( isset( $cache_plugins[ $plugin_folder ] ) ) {
                return $cache_plugins[ $plugin_folder ];
        }

        $wp_plugins  = array();
        $plugin_root = WP_PLUGIN_DIR;
        if ( ! empty( $plugin_folder ) ) {
                $plugin_root .= $plugin_folder;
        }

        // Files in wp-content/plugins directory
        $plugins_dir  = @ opendir( $plugin_root );
        $plugin_files = array();
        if ( $plugins_dir ) {
                while ( ( $file = readdir( $plugins_dir ) ) !== false ) {
                        if ( substr( $file, 0, 1 ) == '.' ) {
                                continue;
                        }
                        if ( is_dir( $plugin_root . '/' . $file ) ) {
                                $plugins_subdir = @ opendir( $plugin_root . '/' . $file );
                                if ( $plugins_subdir ) {
                                        while ( ( $subfile = readdir( $plugins_subdir ) ) !== false ) {
                                                if ( substr( $subfile, 0, 1 ) == '.' ) {
                                                        continue;
                                                }
                                                if ( substr( $subfile, -4 ) == '.php' ) {
                                                        $plugin_files[] = "$file/$subfile";
                                                }
                                        }
                                        closedir( $plugins_subdir );
                                }
                        } else {
                                if ( substr( $file, -4 ) == '.php' ) {
                                        $plugin_files[] = $file;
                                }
                        }
                }
                closedir( $plugins_dir );
        }

        if ( empty( $plugin_files ) ) {
                return $wp_plugins;
        }

        foreach ( $plugin_files as $plugin_file ) {
                if ( ! is_readable( "$plugin_root/$plugin_file" ) ) {
                        continue;
                }

                $plugin_data = get_plugin_data( "$plugin_root/$plugin_file", false, false ); //Do not apply markup/translate as it'll be cached.

                if ( empty( $plugin_data['Name'] ) ) {
                        continue;
                }

                $wp_plugins[ plugin_basename( $plugin_file ) ] = $plugin_data;
        }

        uasort( $wp_plugins, '_sort_uname_callback' );

        $cache_plugins[ $plugin_folder ] = $wp_plugins;
        wp_cache_set( 'plugins', $cache_plugins, 'plugins' );

        return $wp_plugins;
}

/**
 * Check the mu-plugins directory and retrieve all mu-plugin files with any plugin data.
 *
 * WordPress only includes mu-plugin files in the base mu-plugins directory (wp-content/mu-plugins).
 *
 * @since 3.0.0
 * @return array Key is the mu-plugin file path and the value is an array of the mu-plugin data.
 */
function get_mu_plugins() {
        $wp_plugins = array();
        // Files in wp-content/mu-plugins directory
        $plugin_files = array();

        if ( ! is_dir( WPMU_PLUGIN_DIR ) ) {
                return $wp_plugins;
        }
        if ( $plugins_dir = @ opendir( WPMU_PLUGIN_DIR ) ) {
                while ( ( $file = readdir( $plugins_dir ) ) !== false ) {
                        if ( substr( $file, -4 ) == '.php' ) {
                                $plugin_files[] = $file;
                        }
                }
        } else {
                return $wp_plugins;
        }

        @closedir( $plugins_dir );

        if ( empty( $plugin_files ) ) {
                return $wp_plugins;
        }

        foreach ( $plugin_files as $plugin_file ) {
                if ( ! is_readable( WPMU_PLUGIN_DIR . "/$plugin_file" ) ) {
                        continue;
                }

                $plugin_data = get_plugin_data( WPMU_PLUGIN_DIR . "/$plugin_file", false, false ); //Do not apply markup/translate as it'll be cached.

                if ( empty( $plugin_data['Name'] ) ) {
                        $plugin_data['Name'] = $plugin_file;
                }

                $wp_plugins[ $plugin_file ] = $plugin_data;
        }

        if ( isset( $wp_plugins['index.php'] ) && filesize( WPMU_PLUGIN_DIR . '/index.php' ) <= 30 ) { // silence is golden
                unset( $wp_plugins['index.php'] );
        }

        uasort( $wp_plugins, '_sort_uname_callback' );

        return $wp_plugins;
}

/**
 * Callback to sort array by a 'Name' key.
 *
 * @since 3.1.0
 *
 * @access private
 *
 * @param array $a array with 'Name' key.
 * @param array $b array with 'Name' key.
 * @return int Return 0 or 1 based on two string comparison.
 */
function _sort_uname_callback( $a, $b ) {
        return strnatcasecmp( $a['Name'], $b['Name'] );
}

/**
 * Check the wp-content directory and retrieve all drop-ins with any plugin data.
 *
 * @since 3.0.0
 * @return array Key is the file path and the value is an array of the plugin data.
 */
function get_dropins() {
        $dropins      = array();
        $plugin_files = array();

        $_dropins = _get_dropins();

        // These exist in the wp-content directory
        if ( $plugins_dir = @ opendir( WP_CONTENT_DIR ) ) {
                while ( ( $file = readdir( $plugins_dir ) ) !== false ) {
                        if ( isset( $_dropins[ $file ] ) ) {
                                $plugin_files[] = $file;
                        }
                }
        } else {
                return $dropins;
        }

        @closedir( $plugins_dir );

        if ( empty( $plugin_files ) ) {
                return $dropins;
        }

        foreach ( $plugin_files as $plugin_file ) {
                if ( ! is_readable( WP_CONTENT_DIR . "/$plugin_file" ) ) {
                        continue;
                }
                $plugin_data = get_plugin_data( WP_CONTENT_DIR . "/$plugin_file", false, false ); //Do not apply markup/translate as it'll be cached.
                if ( empty( $plugin_data['Name'] ) ) {
                        $plugin_data['Name'] = $plugin_file;
                }
                $dropins[ $plugin_file ] = $plugin_data;
        }

        uksort( $dropins, 'strnatcasecmp' );

        return $dropins;
}

/**
 * Returns drop-ins that WordPress uses.
 *
 * Includes Multisite drop-ins only when is_multisite()
 *
 * @since 3.0.0
 * @return array Key is file name. The value is an array, with the first value the
 *  purpose of the drop-in and the second value the name of the constant that must be
 *  true for the drop-in to be used, or true if no constant is required.
 */
function _get_dropins() {
        $dropins = array(
                'advanced-cache.php'      => array( __( 'Advanced caching plugin.' ), 'WP_CACHE' ), // WP_CACHE
                'db.php'                  => array( __( 'Custom database class.' ), true ), // auto on load
                'db-error.php'            => array( __( 'Custom database error message.' ), true ), // auto on error
                'install.php'             => array( __( 'Custom installation script.' ), true ), // auto on installation
                'maintenance.php'         => array( __( 'Custom maintenance message.' ), true ), // auto on maintenance
                'object-cache.php'        => array( __( 'External object cache.' ), true ), // auto on load
                'php-error.php'           => array( __( 'Custom PHP error message.' ), true ), // auto on error
                'fatal-error-handler.php' => array( __( 'Custom PHP fatal error handler.' ), true ), // auto on error
        );

        if ( is_multisite() ) {
                $dropins['sunrise.php']        = array( __( 'Executed before Multisite is loaded.' ), 'SUNRISE' ); // SUNRISE
                $dropins['blog-deleted.php']   = array( __( 'Custom site deleted message.' ), true ); // auto on deleted blog
                $dropins['blog-inactive.php']  = array( __( 'Custom site inactive message.' ), true ); // auto on inactive blog
                $dropins['blog-suspended.php'] = array( __( 'Custom site suspended message.' ), true ); // auto on archived or spammed blog
        }

        return $dropins;
}

/**
 * Determines whether a plugin is active.
 *
 * Only plugins installed in the plugins/ folder can be active.
 *
 * Plugins in the mu-plugins/ folder can't be "activated," so this function will
 * return false for those plugins.
 *
 * 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 2.5.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return bool True, if in the active plugins list. False, not in the list.
 */
function is_plugin_active( $plugin ) {
        return in_array( $plugin, (array) get_option( 'active_plugins', array() ) ) || is_plugin_active_for_network( $plugin );
}

/**
 * Determines whether the plugin is inactive.
 *
 * Reverse of is_plugin_active(). Used as a callback.
 *
 * 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 3.1.0
 * @see is_plugin_active()
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return bool True if inactive. False if active.
 */
function is_plugin_inactive( $plugin ) {
        return ! is_plugin_active( $plugin );
}

/**
 * Determines whether the plugin is active for the entire network.
 *
 * Only plugins installed in the plugins/ folder can be active.
 *
 * Plugins in the mu-plugins/ folder can't be "activated," so this function will
 * return false for those plugins.
 *
 * 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 3.0.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return bool True if active for the network, otherwise false.
 */
function is_plugin_active_for_network( $plugin ) {
        if ( ! is_multisite() ) {
                return false;
        }

        $plugins = get_site_option( 'active_sitewide_plugins' );
        if ( isset( $plugins[ $plugin ] ) ) {
                return true;
        }

        return false;
}

/**
 * Checks for "Network: true" in the plugin header to see if this should
 * be activated only as a network wide plugin. The plugin would also work
 * when Multisite is not enabled.
 *
 * Checks for "Site Wide Only: true" for backward compatibility.
 *
 * @since 3.0.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return bool True if plugin is network only, false otherwise.
 */
function is_network_only_plugin( $plugin ) {
        $plugin_data = get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin );
        if ( $plugin_data ) {
                return $plugin_data['Network'];
        }
        return false;
}

/**
 * Attempts activation of plugin in a "sandbox" and redirects on success.
 *
 * A plugin that is already activated will not attempt to be activated again.
 *
 * The way it works is by setting the redirection to the error before trying to
 * include the plugin file. If the plugin fails, then the redirection will not
 * be overwritten with the success message. Also, the options will not be
 * updated and the activation hook will not be called on plugin error.
 *
 * It should be noted that in no way the below code will actually prevent errors
 * within the file. The code should not be used elsewhere to replicate the
 * "sandbox", which uses redirection to work.
 * {@source 13 1}
 *
 * If any errors are found or text is outputted, then it will be captured to
 * ensure that the success redirection will update the error redirection.
 *
 * @since 2.5.0
 * @since 5.2.0 Test for WordPress version and PHP version compatibility.
 *
 * @param string $plugin       Path to the plugin file relative to the plugins directory.
 * @param string $redirect     Optional. URL to redirect to.
 * @param bool   $network_wide Optional. Whether to enable the plugin for all sites in the network
 *                             or just the current site. Multisite only. Default false.
 * @param bool   $silent       Optional. Whether to prevent calling activation hooks. Default false.
 * @return WP_Error|null WP_Error on invalid file or null on success.
 */
function activate_plugin( $plugin, $redirect = '', $network_wide = false, $silent = false ) {
        $plugin = plugin_basename( trim( $plugin ) );

        if ( is_multisite() && ( $network_wide || is_network_only_plugin( $plugin ) ) ) {
                $network_wide        = true;
                $current             = get_site_option( 'active_sitewide_plugins', array() );
                $_GET['networkwide'] = 1; // Back compat for plugins looking for this value.
        } else {
                $current = get_option( 'active_plugins', array() );
        }

        $valid = validate_plugin( $plugin );
        if ( is_wp_error( $valid ) ) {
                return $valid;
        }

        $requirements = validate_plugin_requirements( $plugin );
        if ( is_wp_error( $requirements ) ) {
                return $requirements;
        }

        if ( ( $network_wide && ! isset( $current[ $plugin ] ) ) || ( ! $network_wide && ! in_array( $plugin, $current ) ) ) {
                if ( ! empty( $redirect ) ) {
                        wp_redirect( add_query_arg( '_error_nonce', wp_create_nonce( 'plugin-activation-error_' . $plugin ), $redirect ) ); // we'll override this later if the plugin can be included without fatal error
                }

                ob_start();
                wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $plugin );
                $_wp_plugin_file = $plugin;
                if ( ! defined( 'WP_SANDBOX_SCRAPING' ) ) {
                        define( 'WP_SANDBOX_SCRAPING', true );
                }
                include_once( WP_PLUGIN_DIR . '/' . $plugin );
                $plugin = $_wp_plugin_file; // Avoid stomping of the $plugin variable in a plugin.

                if ( ! $silent ) {
                        /**
                         * Fires before a plugin is activated.
                         *
                         * If a plugin is silently activated (such as during an update),
                         * this hook does not fire.
                         *
                         * @since 2.9.0
                         *
                         * @param string $plugin       Path to the plugin file relative to the plugins directory.
                         * @param bool   $network_wide Whether to enable the plugin for all sites in the network
                         *                             or just the current site. Multisite only. Default is false.
                         */
                        do_action( 'activate_plugin', $plugin, $network_wide );

                        /**
                         * Fires as a specific plugin is being activated.
                         *
                         * This hook is the "activation" hook used internally by register_activation_hook().
                         * The dynamic portion of the hook name, `$plugin`, refers to the plugin basename.
                         *
                         * If a plugin is silently activated (such as during an update), this hook does not fire.
                         *
                         * @since 2.0.0
                         *
                         * @param bool $network_wide Whether to enable the plugin for all sites in the network
                         *                           or just the current site. Multisite only. Default is false.
                         */
                        do_action( "activate_{$plugin}", $network_wide );
                }

                if ( $network_wide ) {
                        $current            = get_site_option( 'active_sitewide_plugins', array() );
                        $current[ $plugin ] = time();
                        update_site_option( 'active_sitewide_plugins', $current );
                } else {
                        $current   = get_option( 'active_plugins', array() );
                        $current[] = $plugin;
                        sort( $current );
                        update_option( 'active_plugins', $current );
                }

                if ( ! $silent ) {
                        /**
                         * Fires after a plugin has been activated.
                         *
                         * If a plugin is silently activated (such as during an update),
                         * this hook does not fire.
                         *
                         * @since 2.9.0
                         *
                         * @param string $plugin       Path to the plugin file relative to the plugins directory.
                         * @param bool   $network_wide Whether to enable the plugin for all sites in the network
                         *                             or just the current site. Multisite only. Default is false.
                         */
                        do_action( 'activated_plugin', $plugin, $network_wide );
                }

                if ( ob_get_length() > 0 ) {
                        $output = ob_get_clean();
                        return new WP_Error( 'unexpected_output', __( 'The plugin generated unexpected output.' ), $output );
                }
                ob_end_clean();
        }

        return null;
}

/**
 * Deactivate a single plugin or multiple plugins.
 *
 * The deactivation hook is disabled by the plugin upgrader by using the $silent
 * parameter.
 *
 * @since 2.5.0
 *
 * @param string|array $plugins Single plugin or list of plugins to deactivate.
 * @param bool $silent Prevent calling deactivation hooks. Default is false.
 * @param mixed $network_wide Whether to deactivate the plugin for all sites in the network.
 *  A value of null (the default) will deactivate plugins for both the site and the network.
 */
function deactivate_plugins( $plugins, $silent = false, $network_wide = null ) {
        if ( is_multisite() ) {
                $network_current = get_site_option( 'active_sitewide_plugins', array() );
        }
        $current = get_option( 'active_plugins', array() );
        $do_blog = $do_network = false;

        foreach ( (array) $plugins as $plugin ) {
                $plugin = plugin_basename( trim( $plugin ) );
                if ( ! is_plugin_active( $plugin ) ) {
                        continue;
                }

                $network_deactivating = false !== $network_wide && is_plugin_active_for_network( $plugin );

                if ( ! $silent ) {
                        /**
                         * Fires before a plugin is deactivated.
                         *
                         * If a plugin is silently deactivated (such as during an update),
                         * this hook does not fire.
                         *
                         * @since 2.9.0
                         *
                         * @param string $plugin               Path to the plugin file relative to the plugins directory.
                         * @param bool   $network_deactivating Whether the plugin is deactivated for all sites in the network
                         *                                     or just the current site. Multisite only. Default is false.
                         */
                        do_action( 'deactivate_plugin', $plugin, $network_deactivating );
                }

                if ( false !== $network_wide ) {
                        if ( is_plugin_active_for_network( $plugin ) ) {
                                $do_network = true;
                                unset( $network_current[ $plugin ] );
                        } elseif ( $network_wide ) {
                                continue;
                        }
                }

                if ( true !== $network_wide ) {
                        $key = array_search( $plugin, $current );
                        if ( false !== $key ) {
                                $do_blog = true;
                                unset( $current[ $key ] );
                        }
                }

                if ( $do_blog && wp_is_recovery_mode() ) {
                        list( $extension ) = explode( '/', $plugin );
                        wp_paused_plugins()->delete( $extension );
                }

                if ( ! $silent ) {
                        /**
                         * Fires as a specific plugin is being deactivated.
                         *
                         * This hook is the "deactivation" hook used internally by register_deactivation_hook().
                         * The dynamic portion of the hook name, `$plugin`, refers to the plugin basename.
                         *
                         * If a plugin is silently deactivated (such as during an update), this hook does not fire.
                         *
                         * @since 2.0.0
                         *
                         * @param bool $network_deactivating Whether the plugin is deactivated for all sites in the network
                         *                                   or just the current site. Multisite only. Default is false.
                         */
                        do_action( "deactivate_{$plugin}", $network_deactivating );

                        /**
                         * Fires after a plugin is deactivated.
                         *
                         * If a plugin is silently deactivated (such as during an update),
                         * this hook does not fire.
                         *
                         * @since 2.9.0
                         *
                         * @param string $plugin               Path to the plugin file relative to the plugins directory.
                         * @param bool   $network_deactivating Whether the plugin is deactivated for all sites in the network.
                         *                                     or just the current site. Multisite only. Default false.
                         */
                        do_action( 'deactivated_plugin', $plugin, $network_deactivating );
                }
        }

        if ( $do_blog ) {
                update_option( 'active_plugins', $current );
        }
        if ( $do_network ) {
                update_site_option( 'active_sitewide_plugins', $network_current );
        }
}

/**
 * Activate multiple plugins.
 *
 * When WP_Error is returned, it does not mean that one of the plugins had
 * errors. It means that one or more of the plugins file path was invalid.
 *
 * The execution will be halted as soon as one of the plugins has an error.
 *
 * @since 2.6.0
 *
 * @param string|array $plugins Single plugin or list of plugins to activate.
 * @param string $redirect Redirect to page after successful activation.
 * @param bool $network_wide Whether to enable the plugin for all sites in the network.
 * @param bool $silent Prevent calling activation hooks. Default is false.
 * @return bool|WP_Error True when finished or WP_Error if there were errors during a plugin activation.
 */
function activate_plugins( $plugins, $redirect = '', $network_wide = false, $silent = false ) {
        if ( ! is_array( $plugins ) ) {
                $plugins = array( $plugins );
        }

        $errors = array();
        foreach ( $plugins as $plugin ) {
                if ( ! empty( $redirect ) ) {
                        $redirect = add_query_arg( 'plugin', $plugin, $redirect );
                }
                $result = activate_plugin( $plugin, $redirect, $network_wide, $silent );
                if ( is_wp_error( $result ) ) {
                        $errors[ $plugin ] = $result;
                }
        }

        if ( ! empty( $errors ) ) {
                return new WP_Error( 'plugins_invalid', __( 'One of the plugins is invalid.' ), $errors );
        }

        return true;
}

/**
 * Remove directory and files of a plugin for a list of plugins.
 *
 * @since 2.6.0
 *
 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
 *
 * @param string[] $plugins    List of plugin paths to delete, relative to the plugins directory.
 * @param string   $deprecated Not used.
 * @return bool|null|WP_Error True on success, false if `$plugins` is empty, `WP_Error` on failure.
 *                            `null` if filesystem credentials are required to proceed.
 */
function delete_plugins( $plugins, $deprecated = '' ) {
        global $wp_filesystem;

        if ( empty( $plugins ) ) {
                return false;
        }

        $checked = array();
        foreach ( $plugins as $plugin ) {
                $checked[] = 'checked[]=' . $plugin;
        }

        $url = wp_nonce_url( 'plugins.php?action=delete-selected&verify-delete=1&' . implode( '&', $checked ), 'bulk-plugins' );

        ob_start();
        $credentials = request_filesystem_credentials( $url );
        $data        = ob_get_clean();

        if ( false === $credentials ) {
                if ( ! empty( $data ) ) {
                        include_once( ABSPATH . 'wp-admin/admin-header.php' );
                        echo $data;
                        include( ABSPATH . 'wp-admin/admin-footer.php' );
                        exit;
                }
                return;
        }

        if ( ! WP_Filesystem( $credentials ) ) {
                ob_start();
                request_filesystem_credentials( $url, '', true ); // Failed to connect, Error and request again.
                $data = ob_get_clean();

                if ( ! empty( $data ) ) {
                        include_once( ABSPATH . 'wp-admin/admin-header.php' );
                        echo $data;
                        include( ABSPATH . 'wp-admin/admin-footer.php' );
                        exit;
                }
                return;
        }

        if ( ! is_object( $wp_filesystem ) ) {
                return new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );
        }

        if ( is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) {
                return new WP_Error( 'fs_error', __( 'Filesystem error.' ), $wp_filesystem->errors );
        }

        // Get the base plugin folder.
        $plugins_dir = $wp_filesystem->wp_plugins_dir();
        if ( empty( $plugins_dir ) ) {
                return new WP_Error( 'fs_no_plugins_dir', __( 'Unable to locate WordPress plugin directory.' ) );
        }

        $plugins_dir = trailingslashit( $plugins_dir );

        $plugin_translations = wp_get_installed_translations( 'plugins' );

        $errors = array();

        foreach ( $plugins as $plugin_file ) {
                // Run Uninstall hook.
                if ( is_uninstallable_plugin( $plugin_file ) ) {
                        uninstall_plugin( $plugin_file );
                }

                /**
                 * Fires immediately before a plugin deletion attempt.
                 *
                 * @since 4.4.0
                 *
                 * @param string $plugin_file Path to the plugin file relative to the plugins directory.
                 */
                do_action( 'delete_plugin', $plugin_file );

                $this_plugin_dir = trailingslashit( dirname( $plugins_dir . $plugin_file ) );

                // If plugin is in its own directory, recursively delete the directory.
                if ( strpos( $plugin_file, '/' ) && $this_plugin_dir != $plugins_dir ) { //base check on if plugin includes directory separator AND that it's not the root plugin folder
                        $deleted = $wp_filesystem->delete( $this_plugin_dir, true );
                } else {
                        $deleted = $wp_filesystem->delete( $plugins_dir . $plugin_file );
                }

                /**
                 * Fires immediately after a plugin deletion attempt.
                 *
                 * @since 4.4.0
                 *
                 * @param string $plugin_file Path to the plugin file relative to the plugins directory.
                 * @param bool   $deleted     Whether the plugin deletion was successful.
                 */
                do_action( 'deleted_plugin', $plugin_file, $deleted );

                if ( ! $deleted ) {
                        $errors[] = $plugin_file;
                        continue;
                }

                // Remove language files, silently.
                $plugin_slug = dirname( $plugin_file );
                if ( '.' !== $plugin_slug && ! empty( $plugin_translations[ $plugin_slug ] ) ) {
                        $translations = $plugin_translations[ $plugin_slug ];

                        foreach ( $translations as $translation => $data ) {
                                $wp_filesystem->delete( WP_LANG_DIR . '/plugins/' . $plugin_slug . '-' . $translation . '.po' );
                                $wp_filesystem->delete( WP_LANG_DIR . '/plugins/' . $plugin_slug . '-' . $translation . '.mo' );

                                $json_translation_files = glob( WP_LANG_DIR . '/plugins/' . $plugin_slug . '-' . $translation . '-*.json' );
                                if ( $json_translation_files ) {
                                        array_map( array( $wp_filesystem, 'delete' ), $json_translation_files );
                                }
                        }
                }
        }

        // Remove deleted plugins from the plugin updates list.
        if ( $current = get_site_transient( 'update_plugins' ) ) {
                // Don't remove the plugins that weren't deleted.
                $deleted = array_diff( $plugins, $errors );

                foreach ( $deleted as $plugin_file ) {
                        unset( $current->response[ $plugin_file ] );
                }

                set_site_transient( 'update_plugins', $current );
        }

        if ( ! empty( $errors ) ) {
                if ( 1 === count( $errors ) ) {
                        /* translators: %s: plugin filename */
                        $message = __( 'Could not fully remove the plugin %s.' );
                } else {
                        /* translators: %s: comma-separated list of plugin filenames */
                        $message = __( 'Could not fully remove the plugins %s.' );
                }

                return new WP_Error( 'could_not_remove_plugin', sprintf( $message, implode( ', ', $errors ) ) );
        }

        return true;
}

/**
 * Validate active plugins
 *
 * Validate all active plugins, deactivates invalid and
 * returns an array of deactivated ones.
 *
 * @since 2.5.0
 * @return array invalid plugins, plugin as key, error as value
 */
function validate_active_plugins() {
        $plugins = get_option( 'active_plugins', array() );
        // Validate vartype: array.
        if ( ! is_array( $plugins ) ) {
                update_option( 'active_plugins', array() );
                $plugins = array();
        }

        if ( is_multisite() && current_user_can( 'manage_network_plugins' ) ) {
                $network_plugins = (array) get_site_option( 'active_sitewide_plugins', array() );
                $plugins         = array_merge( $plugins, array_keys( $network_plugins ) );
        }

        if ( empty( $plugins ) ) {
                return array();
        }

        $invalid = array();

        // Invalid plugins get deactivated.
        foreach ( $plugins as $plugin ) {
                $result = validate_plugin( $plugin );
                if ( is_wp_error( $result ) ) {
                        $invalid[ $plugin ] = $result;
                        deactivate_plugins( $plugin, true );
                }
        }
        return $invalid;
}

/**
 * Validate the plugin path.
 *
 * Checks that the main plugin file exists and is a valid plugin. See validate_file().
 *
 * @since 2.5.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return WP_Error|int 0 on success, WP_Error on failure.
 */
function validate_plugin( $plugin ) {
        if ( validate_file( $plugin ) ) {
                return new WP_Error( 'plugin_invalid', __( 'Invalid plugin path.' ) );
        }
        if ( ! file_exists( WP_PLUGIN_DIR . '/' . $plugin ) ) {
                return new WP_Error( 'plugin_not_found', __( 'Plugin file does not exist.' ) );
        }

        $installed_plugins = get_plugins();
        if ( ! isset( $installed_plugins[ $plugin ] ) ) {
                return new WP_Error( 'no_plugin_header', __( 'The plugin does not have a valid header.' ) );
        }
        return 0;
}

/**
 * Validate the plugin requirements for WP version and PHP version.
 *
 * @since 5.2.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return true|WP_Error True if requirements are met, WP_Error on failure.
 */
function validate_plugin_requirements( $plugin ) {
        $readme_file = WP_PLUGIN_DIR . '/' . dirname( $plugin ) . '/readme.txt';

        if ( file_exists( $readme_file ) ) {
                $plugin_data = get_file_data(
                        $readme_file,
                        array(
                                'requires'     => 'Requires at least',
                                'requires_php' => 'Requires PHP',
                        ),
                        'plugin'
                );
        } else {
                return true;
        }

        $plugin_data['wp_compatible']  = is_wp_version_compatible( $plugin_data['requires'] );
        $plugin_data['php_compatible'] = is_php_version_compatible( $plugin_data['requires_php'] );

        $plugin_data = array_merge( $plugin_data, get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin ) );

        if ( ! $plugin_data['wp_compatible'] && ! $plugin_data['php_compatible'] ) {
                return new WP_Error(
                        'plugin_wp_php_incompatible',
                        sprintf(
                                /* translators: %s: plugin name */
                                __( '<strong>Error:</strong> Current WordPress and PHP versions do not meet minimum requirements for %s.' ),
                                $plugin_data['Name']
                        )
                );
        } elseif ( ! $plugin_data['php_compatible'] ) {
                return new WP_Error(
                        'plugin_php_incompatible',
                        sprintf(
                                /* translators: %s: plugin name */
                                __( '<strong>Error:</strong> Current PHP version does not meet minimum requirements for %s.' ),
                                $plugin_data['Name']
                        )
                );
        } elseif ( ! $plugin_data['wp_compatible'] ) {
                return new WP_Error(
                        'plugin_wp_incompatible',
                        sprintf(
                                /* translators: %s: plugin name */
                                __( '<strong>Error:</strong> Current WordPress version does not meet minimum requirements for %s.' ),
                                $plugin_data['Name']
                        )
                );
        }

        return true;
}

/**
 * Whether the plugin can be uninstalled.
 *
 * @since 2.7.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return bool Whether plugin can be uninstalled.
 */
function is_uninstallable_plugin( $plugin ) {
        $file = plugin_basename( $plugin );

        $uninstallable_plugins = (array) get_option( 'uninstall_plugins' );
        if ( isset( $uninstallable_plugins[ $file ] ) || file_exists( WP_PLUGIN_DIR . '/' . dirname( $file ) . '/uninstall.php' ) ) {
                return true;
        }

        return false;
}

/**
 * Uninstall a single plugin.
 *
 * Calls the uninstall hook, if it is available.
 *
 * @since 2.7.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return true True if a plugin's uninstall.php file has been found and included.
 */
function uninstall_plugin( $plugin ) {
        $file = plugin_basename( $plugin );

        $uninstallable_plugins = (array) get_option( 'uninstall_plugins' );

        /**
         * Fires in uninstall_plugin() immediately before the plugin is uninstalled.
         *
         * @since 4.5.0
         *
         * @param string $plugin                Path to the plugin file relative to the plugins directory.
         * @param array  $uninstallable_plugins Uninstallable plugins.
         */
        do_action( 'pre_uninstall_plugin', $plugin, $uninstallable_plugins );

        if ( file_exists( WP_PLUGIN_DIR . '/' . dirname( $file ) . '/uninstall.php' ) ) {
                if ( isset( $uninstallable_plugins[ $file ] ) ) {
                        unset( $uninstallable_plugins[ $file ] );
                        update_option( 'uninstall_plugins', $uninstallable_plugins );
                }
                unset( $uninstallable_plugins );

                define( 'WP_UNINSTALL_PLUGIN', $file );
                wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $file );
                include( WP_PLUGIN_DIR . '/' . dirname( $file ) . '/uninstall.php' );

                return true;
        }

        if ( isset( $uninstallable_plugins[ $file ] ) ) {
                $callable = $uninstallable_plugins[ $file ];
                unset( $uninstallable_plugins[ $file ] );
                update_option( 'uninstall_plugins', $uninstallable_plugins );
                unset( $uninstallable_plugins );

                wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $file );
                include( WP_PLUGIN_DIR . '/' . $file );

                add_action( "uninstall_{$file}", $callable );

                /**
                 * Fires in uninstall_plugin() once the plugin has been uninstalled.
                 *
                 * The action concatenates the 'uninstall_' prefix with the basename of the
                 * plugin passed to uninstall_plugin() to create a dynamically-named action.
                 *
                 * @since 2.7.0
                 */
                do_action( "uninstall_{$file}" );
        }
}

//
// Menu
//

/**
 * Add a top-level menu page.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 1.5.0
 *
 * @global array $menu
 * @global array $admin_page_hooks
 * @global array $_registered_pages
 * @global array $_parent_pages
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by. Should be unique for this menu page and only
 *                             include lowercase alphanumeric, dashes, and underscores characters to be compatible
 *                             with sanitize_key().
 * @param callable $function   The function to be called to output the content for this page.
 * @param string   $icon_url   The URL to the icon to be used for this menu.
 *                             * Pass a base64-encoded SVG using a data URI, which will be colored to match
 *                               the color scheme. This should begin with 'data:image/svg+xml;base64,'.
 *                             * Pass the name of a Dashicons helper class to use a font icon,
 *                               e.g. 'dashicons-chart-pie'.
 *                             * Pass 'none' to leave div.wp-menu-image empty so an icon can be added via CSS.
 * @param int      $position   The position in the menu order this one should appear.
 * @return string The resulting page's hook_suffix.
 */
function add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $function = '', $icon_url = '', $position = null ) {
        global $menu, $admin_page_hooks, $_registered_pages, $_parent_pages;

        $menu_slug = plugin_basename( $menu_slug );

        $admin_page_hooks[ $menu_slug ] = sanitize_title( $menu_title );

        $hookname = get_plugin_page_hookname( $menu_slug, '' );

        if ( ! empty( $function ) && ! empty( $hookname ) && current_user_can( $capability ) ) {
                add_action( $hookname, $function );
        }

        if ( empty( $icon_url ) ) {
                $icon_url   = 'dashicons-admin-generic';
                $icon_class = 'menu-icon-generic ';
        } else {
                $icon_url   = set_url_scheme( $icon_url );
                $icon_class = '';
        }

        $new_menu = array( $menu_title, $capability, $menu_slug, $page_title, 'menu-top ' . $icon_class . $hookname, $hookname, $icon_url );

        if ( null === $position ) {
                $menu[] = $new_menu;
        } elseif ( isset( $menu[ "$position" ] ) ) {
                $position            = $position + substr( base_convert( md5( $menu_slug . $menu_title ), 16, 10 ), -5 ) * 0.00001;
                $menu[ "$position" ] = $new_menu;
        } else {
                $menu[ $position ] = $new_menu;
        }

        $_registered_pages[ $hookname ] = true;

        // No parent as top level
        $_parent_pages[ $menu_slug ] = false;

        return $hookname;
}

/**
 * Add a submenu page.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 1.5.0
 *
 * @global array $submenu
 * @global array $menu
 * @global array $_wp_real_parent_file
 * @global bool  $_wp_submenu_nopriv
 * @global array $_registered_pages
 * @global array $_parent_pages
 *
 * @param string   $parent_slug The slug name for the parent menu (or the file name of a standard
 *                              WordPress admin page).
 * @param string   $page_title  The text to be displayed in the title tags of the page when the menu
 *                              is selected.
 * @param string   $menu_title  The text to be used for the menu.
 * @param string   $capability  The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug   The slug name to refer to this menu by. Should be unique for this menu
 *                              and only include lowercase alphanumeric, dashes, and underscores characters
 *                              to be compatible with sanitize_key().
 * @param callable $function    The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        global $submenu, $menu, $_wp_real_parent_file, $_wp_submenu_nopriv,
                $_registered_pages, $_parent_pages;

        $menu_slug   = plugin_basename( $menu_slug );
        $parent_slug = plugin_basename( $parent_slug );

        if ( isset( $_wp_real_parent_file[ $parent_slug ] ) ) {
                $parent_slug = $_wp_real_parent_file[ $parent_slug ];
        }

        if ( ! current_user_can( $capability ) ) {
                $_wp_submenu_nopriv[ $parent_slug ][ $menu_slug ] = true;
                return false;
        }

        /*
         * If the parent doesn't already have a submenu, add a link to the parent
         * as the first item in the submenu. If the submenu file is the same as the
         * parent file someone is trying to link back to the parent manually. In
         * this case, don't automatically add a link back to avoid duplication.
         */
        if ( ! isset( $submenu[ $parent_slug ] ) && $menu_slug != $parent_slug ) {
                foreach ( (array) $menu as $parent_menu ) {
                        if ( $parent_menu[2] == $parent_slug && current_user_can( $parent_menu[1] ) ) {
                                $submenu[ $parent_slug ][] = array_slice( $parent_menu, 0, 4 );
                        }
                }
        }

        $submenu[ $parent_slug ][] = array( $menu_title, $capability, $menu_slug, $page_title );

        $hookname = get_plugin_page_hookname( $menu_slug, $parent_slug );
        if ( ! empty( $function ) && ! empty( $hookname ) ) {
                add_action( $hookname, $function );
        }

        $_registered_pages[ $hookname ] = true;

        /*
         * Backward-compatibility for plugins using add_management_page().
         * See wp-admin/admin.php for redirect from edit.php to tools.php.
         */
        if ( 'tools.php' == $parent_slug ) {
                $_registered_pages[ get_plugin_page_hookname( $menu_slug, 'edit.php' ) ] = true;
        }

        // No parent as top level.
        $_parent_pages[ $menu_slug ] = $parent_slug;

        return $hookname;
}

/**
 * Add submenu page to the Tools main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 1.5.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_management_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'tools.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Settings main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 1.5.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_options_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'options-general.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Appearance main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 2.0.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_theme_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'themes.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Plugins main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 3.0.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_plugins_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'plugins.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Users/Profile main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 2.1.3
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_users_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        if ( current_user_can( 'edit_users' ) ) {
                $parent = 'users.php';
        } else {
                $parent = 'profile.php';
        }
        return add_submenu_page( $parent, $page_title, $menu_title, $capability, $menu_slug, $function );
}
/**
 * Add submenu page to the Dashboard main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 2.7.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_dashboard_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'index.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Posts main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 2.7.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_posts_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'edit.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Media main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 2.7.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_media_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'upload.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Links main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 2.7.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_links_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'link-manager.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Pages main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 2.7.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_pages_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'edit.php?post_type=page', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Add submenu page to the Comments main menu.
 *
 * This function takes a capability which will be used to determine whether
 * or not a page is included in the menu.
 *
 * The function which is hooked in to handle the output of the page must check
 * that the user has the required capability as well.
 *
 * @since 2.7.0
 *
 * @param string   $page_title The text to be displayed in the title tags of the page when the menu is selected.
 * @param string   $menu_title The text to be used for the menu.
 * @param string   $capability The capability required for this menu to be displayed to the user.
 * @param string   $menu_slug  The slug name to refer to this menu by (should be unique for this menu).
 * @param callable $function   The function to be called to output the content for this page.
 * @return false|string The resulting page's hook_suffix, or false if the user does not have the capability required.
 */
function add_comments_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
        return add_submenu_page( 'edit-comments.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
 * Remove a top-level admin menu.
 *
 * @since 3.1.0
 *
 * @global array $menu
 *
 * @param string $menu_slug The slug of the menu.
 * @return array|bool The removed menu on success, false if not found.
 */
function remove_menu_page( $menu_slug ) {
        global $menu;

        foreach ( $menu as $i => $item ) {
                if ( $menu_slug == $item[2] ) {
                        unset( $menu[ $i ] );
                        return $item;
                }
        }

        return false;
}

/**
 * Remove an admin submenu.
 *
 * @since 3.1.0
 *
 * @global array $submenu
 *
 * @param string $menu_slug    The slug for the parent menu.
 * @param string $submenu_slug The slug of the submenu.
 * @return array|bool The removed submenu on success, false if not found.
 */
function remove_submenu_page( $menu_slug, $submenu_slug ) {
        global $submenu;

        if ( ! isset( $submenu[ $menu_slug ] ) ) {
                return false;
        }

        foreach ( $submenu[ $menu_slug ] as $i => $item ) {
                if ( $submenu_slug == $item[2] ) {
                        unset( $submenu[ $menu_slug ][ $i ] );
                        return $item;
                }
        }

        return false;
}

/**
 * Get the url to access a particular menu page based on the slug it was registered with.
 *
 * If the slug hasn't been registered properly no url will be returned
 *
 * @since 3.0.0
 *
 * @global array $_parent_pages
 *
 * @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
 * @param bool $echo Whether or not to echo the url - default is true
 * @return string the url
 */
function menu_page_url( $menu_slug, $echo = true ) {
        global $_parent_pages;

        if ( isset( $_parent_pages[ $menu_slug ] ) ) {
                $parent_slug = $_parent_pages[ $menu_slug ];
                if ( $parent_slug && ! isset( $_parent_pages[ $parent_slug ] ) ) {
                        $url = admin_url( add_query_arg( 'page', $menu_slug, $parent_slug ) );
                } else {
                        $url = admin_url( 'admin.php?page=' . $menu_slug );
                }
        } else {
                $url = '';
        }

        $url = esc_url( $url );

        if ( $echo ) {
                echo $url;
        }

        return $url;
}

//
// Pluggable Menu Support -- Private
//
/**
 * @global string $parent_file
 * @global array $menu
 * @global array $submenu
 * @global string $pagenow
 * @global string $typenow
 * @global string $plugin_page
 * @global array $_wp_real_parent_file
 * @global array $_wp_menu_nopriv
 * @global array $_wp_submenu_nopriv
 *
 * @return string
 */
function get_admin_page_parent( $parent = '' ) {
        global $parent_file, $menu, $submenu, $pagenow, $typenow,
                $plugin_page, $_wp_real_parent_file, $_wp_menu_nopriv, $_wp_submenu_nopriv;

        if ( ! empty( $parent ) && 'admin.php' != $parent ) {
                if ( isset( $_wp_real_parent_file[ $parent ] ) ) {
                        $parent = $_wp_real_parent_file[ $parent ];
                }
                return $parent;
        }

        if ( $pagenow == 'admin.php' && isset( $plugin_page ) ) {
                foreach ( (array) $menu as $parent_menu ) {
                        if ( $parent_menu[2] == $plugin_page ) {
                                $parent_file = $plugin_page;
                                if ( isset( $_wp_real_parent_file[ $parent_file ] ) ) {
                                        $parent_file = $_wp_real_parent_file[ $parent_file ];
                                }
                                return $parent_file;
                        }
                }
                if ( isset( $_wp_menu_nopriv[ $plugin_page ] ) ) {
                        $parent_file = $plugin_page;
                        if ( isset( $_wp_real_parent_file[ $parent_file ] ) ) {
                                        $parent_file = $_wp_real_parent_file[ $parent_file ];
                        }
                        return $parent_file;
                }
        }

        if ( isset( $plugin_page ) && isset( $_wp_submenu_nopriv[ $pagenow ][ $plugin_page ] ) ) {
                $parent_file = $pagenow;
                if ( isset( $_wp_real_parent_file[ $parent_file ] ) ) {
                        $parent_file = $_wp_real_parent_file[ $parent_file ];
                }
                return $parent_file;
        }

        foreach ( array_keys( (array) $submenu ) as $parent ) {
                foreach ( $submenu[ $parent ] as $submenu_array ) {
                        if ( isset( $_wp_real_parent_file[ $parent ] ) ) {
                                $parent = $_wp_real_parent_file[ $parent ];
                        }
                        if ( ! empty( $typenow ) && ( $submenu_array[2] == "$pagenow?post_type=$typenow" ) ) {
                                $parent_file = $parent;
                                return $parent;
                        } elseif ( $submenu_array[2] == $pagenow && empty( $typenow ) && ( empty( $parent_file ) || false === strpos( $parent_file, '?' ) ) ) {
                                $parent_file = $parent;
                                return $parent;
                        } elseif ( isset( $plugin_page ) && ( $plugin_page == $submenu_array[2] ) ) {
                                $parent_file = $parent;
                                return $parent;
                        }
                }
        }

        if ( empty( $parent_file ) ) {
                $parent_file = '';
        }
        return '';
}

/**
 * @global string $title
 * @global array $menu
 * @global array $submenu
 * @global string $pagenow
 * @global string $plugin_page
 * @global string $typenow
 *
 * @return string
 */
function get_admin_page_title() {
        global $title, $menu, $submenu, $pagenow, $plugin_page, $typenow;

        if ( ! empty( $title ) ) {
                return $title;
        }

        $hook = get_plugin_page_hook( $plugin_page, $pagenow );

        $parent = $parent1 = get_admin_page_parent();

        if ( empty( $parent ) ) {
                foreach ( (array) $menu as $menu_array ) {
                        if ( isset( $menu_array[3] ) ) {
                                if ( $menu_array[2] == $pagenow ) {
                                        $title = $menu_array[3];
                                        return $menu_array[3];
                                } elseif ( isset( $plugin_page ) && ( $plugin_page == $menu_array[2] ) && ( $hook == $menu_array[3] ) ) {
                                        $title = $menu_array[3];
                                        return $menu_array[3];
                                }
                        } else {
                                $title = $menu_array[0];
                                return $title;
                        }
                }
        } else {
                foreach ( array_keys( $submenu ) as $parent ) {
                        foreach ( $submenu[ $parent ] as $submenu_array ) {
                                if ( isset( $plugin_page ) &&
                                        ( $plugin_page == $submenu_array[2] ) &&
                                        (
                                                ( $parent == $pagenow ) ||
                                                ( $parent == $plugin_page ) ||
                                                ( $plugin_page == $hook ) ||
                                                ( $pagenow == 'admin.php' && $parent1 != $submenu_array[2] ) ||
                                                ( ! empty( $typenow ) && $parent == $pagenow . '?post_type=' . $typenow )
                                        )
                                        ) {
                                                $title = $submenu_array[3];
                                                return $submenu_array[3];
                                }

                                if ( $submenu_array[2] != $pagenow || isset( $_GET['page'] ) ) { // not the current page
                                        continue;
                                }

                                if ( isset( $submenu_array[3] ) ) {
                                        $title = $submenu_array[3];
                                        return $submenu_array[3];
                                } else {
                                        $title = $submenu_array[0];
                                        return $title;
                                }
                        }
                }
                if ( empty( $title ) ) {
                        foreach ( $menu as $menu_array ) {
                                if ( isset( $plugin_page ) &&
                                        ( $plugin_page == $menu_array[2] ) &&
                                        ( $pagenow == 'admin.php' ) &&
                                        ( $parent1 == $menu_array[2] ) ) {
                                                $title = $menu_array[3];
                                                return $menu_array[3];
                                }
                        }
                }
        }

        return $title;
}

/**
 * @since 2.3.0
 *
 * @param string $plugin_page The slug name of the plugin page.
 * @param string $parent_page The slug name for the parent menu (or the file name of a standard
 *                            WordPress admin page).
 * @return string|null Hook attached to the plugin page, null otherwise.
 */
function get_plugin_page_hook( $plugin_page, $parent_page ) {
        $hook = get_plugin_page_hookname( $plugin_page, $parent_page );
        if ( has_action( $hook ) ) {
                return $hook;
        } else {
                return null;
        }
}

/**
 * @global array $admin_page_hooks
 *
 * @param string $plugin_page The slug name of the plugin page.
 * @param string $parent_page The slug name for the parent menu (or the file name of a standard
 *                            WordPress admin page).
 * @return string Hook name for the plugin page.
 */
function get_plugin_page_hookname( $plugin_page, $parent_page ) {
        global $admin_page_hooks;

        $parent = get_admin_page_parent( $parent_page );

        $page_type = 'admin';
        if ( empty( $parent_page ) || 'admin.php' == $parent_page || isset( $admin_page_hooks[ $plugin_page ] ) ) {
                if ( isset( $admin_page_hooks[ $plugin_page ] ) ) {
                        $page_type = 'toplevel';
                } elseif ( isset( $admin_page_hooks[ $parent ] ) ) {
                        $page_type = $admin_page_hooks[ $parent ];
                }
        } elseif ( isset( $admin_page_hooks[ $parent ] ) ) {
                $page_type = $admin_page_hooks[ $parent ];
        }

        $plugin_name = preg_replace( '!\.php!', '', $plugin_page );

        return $page_type . '_page_' . $plugin_name;
}

/**
 * @global string $pagenow
 * @global array $menu
 * @global array $submenu
 * @global array $_wp_menu_nopriv
 * @global array $_wp_submenu_nopriv
 * @global string $plugin_page
 * @global array $_registered_pages
 *
 * @return bool Whether the current user can access the current admin page.
 */
function user_can_access_admin_page() {
        global $pagenow, $menu, $submenu, $_wp_menu_nopriv, $_wp_submenu_nopriv,
                $plugin_page, $_registered_pages;

        $parent = get_admin_page_parent();

        if ( ! isset( $plugin_page ) && isset( $_wp_submenu_nopriv[ $parent ][ $pagenow ] ) ) {
                return false;
        }

        if ( isset( $plugin_page ) ) {
                if ( isset( $_wp_submenu_nopriv[ $parent ][ $plugin_page ] ) ) {
                        return false;
                }

                $hookname = get_plugin_page_hookname( $plugin_page, $parent );

                if ( ! isset( $_registered_pages[ $hookname ] ) ) {
                        return false;
                }
        }

        if ( empty( $parent ) ) {
                if ( isset( $_wp_menu_nopriv[ $pagenow ] ) ) {
                        return false;
                }
                if ( isset( $_wp_submenu_nopriv[ $pagenow ][ $pagenow ] ) ) {
                        return false;
                }
                if ( isset( $plugin_page ) && isset( $_wp_submenu_nopriv[ $pagenow ][ $plugin_page ] ) ) {
                        return false;
                }
                if ( isset( $plugin_page ) && isset( $_wp_menu_nopriv[ $plugin_page ] ) ) {
                        return false;
                }
                foreach ( array_keys( $_wp_submenu_nopriv ) as $key ) {
                        if ( isset( $_wp_submenu_nopriv[ $key ][ $pagenow ] ) ) {
                                return false;
                        }
                        if ( isset( $plugin_page ) && isset( $_wp_submenu_nopriv[ $key ][ $plugin_page ] ) ) {
                                return false;
                        }
                }
                return true;
        }

        if ( isset( $plugin_page ) && ( $plugin_page == $parent ) && isset( $_wp_menu_nopriv[ $plugin_page ] ) ) {
                return false;
        }

        if ( isset( $submenu[ $parent ] ) ) {
                foreach ( $submenu[ $parent ] as $submenu_array ) {
                        if ( isset( $plugin_page ) && ( $submenu_array[2] == $plugin_page ) ) {
                                if ( current_user_can( $submenu_array[1] ) ) {
                                        return true;
                                } else {
                                        return false;
                                }
                        } elseif ( $submenu_array[2] == $pagenow ) {
                                if ( current_user_can( $submenu_array[1] ) ) {
                                        return true;
                                } else {
                                        return false;
                                }
                        }
                }
        }

        foreach ( $menu as $menu_array ) {
                if ( $menu_array[2] == $parent ) {
                        if ( current_user_can( $menu_array[1] ) ) {
                                return true;
                        } else {
                                return false;
                        }
                }
        }

        return true;
}

/* Whitelist functions */

/**
 * Refreshes the value of the options whitelist available via the 'whitelist_options' hook.
 *
 * See the {@see 'whitelist_options'} filter.
 *
 * @since 2.7.0
 *
 * @global array $new_whitelist_options
 *
 * @param array $options
 * @return array
 */
function option_update_filter( $options ) {
        global $new_whitelist_options;

        if ( is_array( $new_whitelist_options ) ) {
                $options = add_option_whitelist( $new_whitelist_options, $options );
        }

        return $options;
}

/**
 * Adds an array of options to the options whitelist.
 *
 * @since 2.7.0
 *
 * @global array $whitelist_options
 *
 * @param array        $new_options
 * @param string|array $options
 * @return array
 */
function add_option_whitelist( $new_options, $options = '' ) {
        if ( $options == '' ) {
                global $whitelist_options;
        } else {
                $whitelist_options = $options;
        }

        foreach ( $new_options as $page => $keys ) {
                foreach ( $keys as $key ) {
                        if ( ! isset( $whitelist_options[ $page ] ) || ! is_array( $whitelist_options[ $page ] ) ) {
                                $whitelist_options[ $page ]   = array();
                                $whitelist_options[ $page ][] = $key;
                        } else {
                                $pos = array_search( $key, $whitelist_options[ $page ] );
                                if ( $pos === false ) {
                                        $whitelist_options[ $page ][] = $key;
                                }
                        }
                }
        }

        return $whitelist_options;
}

/**
 * Removes a list of options from the options whitelist.
 *
 * @since 2.7.0
 *
 * @global array $whitelist_options
 *
 * @param array        $del_options
 * @param string|array $options
 * @return array
 */
function remove_option_whitelist( $del_options, $options = '' ) {
        if ( $options == '' ) {
                global $whitelist_options;
        } else {
                $whitelist_options = $options;
        }

        foreach ( $del_options as $page => $keys ) {
                foreach ( $keys as $key ) {
                        if ( isset( $whitelist_options[ $page ] ) && is_array( $whitelist_options[ $page ] ) ) {
                                $pos = array_search( $key, $whitelist_options[ $page ] );
                                if ( $pos !== false ) {
                                        unset( $whitelist_options[ $page ][ $pos ] );
                                }
                        }
                }
        }

        return $whitelist_options;
}

/**
 * Output nonce, action, and option_page fields for a settings page.
 *
 * @since 2.7.0
 *
 * @param string $option_group A settings group name. This should match the group name used in register_setting().
 */
function settings_fields( $option_group ) {
        echo "<input type='hidden' name='option_page' value='" . esc_attr( $option_group ) . "' />";
        echo '<input type="hidden" name="action" value="update" />';
        wp_nonce_field( "$option_group-options" );
}

/**
 * Clears the Plugins cache used by get_plugins() and by default, the Plugin Update cache.
 *
 * @since 3.7.0
 *
 * @param bool $clear_update_cache Whether to clear the Plugin updates cache
 */
function wp_clean_plugins_cache( $clear_update_cache = true ) {
        if ( $clear_update_cache ) {
                delete_site_transient( 'update_plugins' );
        }
        wp_cache_delete( 'plugins', 'plugins' );
}

/**
 * Load a given plugin attempt to generate errors.
 *
 * @since 3.0.0
 * @since 4.4.0 Function was moved into the `wp-admin/includes/plugin.php` file.
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 */
function plugin_sandbox_scrape( $plugin ) {
        if ( ! defined( 'WP_SANDBOX_SCRAPING' ) ) {
                define( 'WP_SANDBOX_SCRAPING', true );
        }
        wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $plugin );
        include( WP_PLUGIN_DIR . '/' . $plugin );
}

/**
 * Helper function for adding content to the Privacy Policy Guide.
 *
 * Plugins and themes should suggest text for inclusion in the site's privacy policy.
 * The suggested text should contain information about any functionality that affects user privacy,
 * and will be shown on the Privacy Policy Guide screen.
 *
 * A plugin or theme can use this function multiple times as long as it will help to better present
 * the suggested policy content. For example modular plugins such as WooCommerse or Jetpack
 * can add or remove suggested content depending on the modules/extensions that are enabled.
 * For more information see the Plugin Handbook:
 * https://developer.wordpress.org/plugins/privacy/suggesting-text-for-the-site-privacy-policy/.
 *
 * Intended for use with the `'admin_init'` action.
 *
 * @since 4.9.6
 *
 * @param string $plugin_name The name of the plugin or theme that is suggesting content for the site's privacy policy.
 * @param string $policy_text The suggested content for inclusion in the policy.
 */
function wp_add_privacy_policy_content( $plugin_name, $policy_text ) {
        if ( ! is_admin() ) {
                _doing_it_wrong(
                        __FUNCTION__,
                        sprintf(
                                /* translators: %s: admin_init */
                                __( 'The suggested privacy policy content should be added only in wp-admin by using the %s (or later) action.' ),
                                '<code>admin_init</code>'
                        ),
                        '4.9.7'
                );
                return;
        } elseif ( ! doing_action( 'admin_init' ) && ! did_action( 'admin_init' ) ) {
                _doing_it_wrong(
                        __FUNCTION__,
                        sprintf(
                                /* translators: %s: admin_init */
                                __( 'The suggested privacy policy content should be added by using the %s (or later) action. Please see the inline documentation.' ),
                                '<code>admin_init</code>'
                        ),
                        '4.9.7'
                );
                return;
        }

        if ( ! class_exists( 'WP_Privacy_Policy_Content' ) ) {
                require_once( ABSPATH . 'wp-admin/includes/misc.php' );
        }

        WP_Privacy_Policy_Content::add( $plugin_name, $policy_text );
}

/**
 * Determines whether a plugin is technically active but was paused while
 * loading.
 *
 * 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 5.2.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins directory.
 * @return bool True, if in the list of paused plugins. False, not in the list.
 */
function is_plugin_paused( $plugin ) {
        if ( ! isset( $GLOBALS['_paused_plugins'] ) ) {
                return false;
        }

        if ( ! is_plugin_active( $plugin ) ) {
                return false;
        }

        list( $plugin ) = explode( '/', $plugin );

        return array_key_exists( $plugin, $GLOBALS['_paused_plugins'] );
}

/**
 * Gets the error that was recorded for a paused plugin.
 *
 * @since 5.2.0
 *
 * @param string $plugin Path to the plugin file relative to the plugins
 *                       directory.
 * @return array|false Array of error information as it was returned by
 *                     `error_get_last()`, or false if none was recorded.
 */
function wp_get_plugin_error( $plugin ) {
        if ( ! isset( $GLOBALS['_paused_plugins'] ) ) {
                return false;
        }

        list( $plugin ) = explode( '/', $plugin );

        if ( ! array_key_exists( $plugin, $GLOBALS['_paused_plugins'] ) ) {
                return false;
        }

        return $GLOBALS['_paused_plugins'][ $plugin ];
}

/**
 * Tries to resume a single plugin.
 *
 * If a redirect was provided, we first ensure the plugin does not throw fatal
 * errors anymore.
 *
 * The way it works is by setting the redirection to the error before trying to
 * include the plugin file. If the plugin fails, then the redirection will not
 * be overwritten with the success message and the plugin will not be resumed.
 *
 * @since 5.2.0
 *
 * @param string $plugin       Single plugin to resume.
 * @param string $redirect     Optional. URL to redirect to. Default empty string.
 * @return bool|WP_Error True on success, false if `$plugin` was not paused,
 *                       `WP_Error` on failure.
 */
function resume_plugin( $plugin, $redirect = '' ) {
        /*
         * We'll override this later if the plugin could be resumed without
         * creating a fatal error.
         */
        if ( ! empty( $redirect ) ) {
                wp_redirect(
                        add_query_arg(
                                '_error_nonce',
                                wp_create_nonce( 'plugin-resume-error_' . $plugin ),
                                $redirect
                        )
                );

                // Load the plugin to test whether it throws a fatal error.
                ob_start();
                plugin_sandbox_scrape( $plugin );
                ob_clean();
        }

        list( $extension ) = explode( '/', $plugin );

        $result = wp_paused_plugins()->delete( $extension );

        if ( ! $result ) {
                return new WP_Error(
                        'could_not_resume_plugin',
                        __( 'Could not resume the plugin.' )
                );
        }

        return true;
}

/**
 * Renders an admin notice in case some plugins have been paused due to errors.
 *
 * @since 5.2.0
 */
function paused_plugins_notice() {
        if ( 'plugins.php' === $GLOBALS['pagenow'] ) {
                return;
        }

        if ( ! current_user_can( 'resume_plugins' ) ) {
                return;
        }

        if ( ! isset( $GLOBALS['_paused_plugins'] ) || empty( $GLOBALS['_paused_plugins'] ) ) {
                return;
        }

        printf(
                '<div class="notice notice-error"><p><strong>%s</strong><br>%s</p><p><a href="%s">%s</a></p></div>',
                __( 'One or more plugins failed to load properly.' ),
                __( 'You can find more details and make changes on the Plugins screen.' ),
                esc_url( admin_url( 'plugins.php?plugin_status=paused' ) ),
                __( 'Go to the Plugins screen' )
        );
}