private static function __domain()
 {
     if (!is_array(self::$_parts)) {
         $config = cmsms()->GetConfig();
         self::$_parts = parse_url($config['root_url']);
     }
     if (!isset(self::$_parts['host']) || self::$_parts['host'] == '') {
         self::$_parts['host'] = $config['root_url'];
     }
     return self::$_parts['host'];
 }