public static function bulk_archive($checked)
 {
     global $wp_filesystem;
     $plugins = get_plugins();
     $form_fields = $_REQUEST;
     $url = add_query_arg($form_fields, admin_url('plugins.php'));
     ob_start();
     $creds = request_filesystem_credentials($url, get_filesystem_method(), false, false);
     $output = ob_get_contents();
     ob_end_clean();
     if ($creds) {
         WP_Filesystem($creds);
         $archive_dir = trailingslashit($wp_filesystem->wp_content_dir() . self::$options['archive_dir']);
         $wp_filesystem->mkdir($archive_dir);
         $count = 0;
         foreach ($_REQUEST['checked'] as $plugin) {
             if (isset($plugins[$plugin])) {
                 $target_dir = self::plugin_basename($plugin, $archive_dir);
                 $plugin_dir = self::plugin_basename($plugin, WP_PLUGIN_DIR);
                 if (self::$options['deactivate']) {
                     deactivate_plugins($plugin);
                 }
                 $result = $wp_filesystem->move($plugin_dir, $target_dir);
                 if ($result) {
                     $count++;
                 }
             }
         }
         self::$count = $count;
     } else {
         unset($_REQUEST['success_action']);
         require_once ABSPATH . 'wp-admin/admin.php';
         require_once ABSPATH . 'wp-admin/admin-header.php';
         echo '<div class="wrap">';
         echo $output;
         echo '</div>';
         include ABSPATH . 'wp-admin/admin-footer.php';
         die('');
     }
 }