ORM::clear_cache PHP Method

    public static function clear_cache($table_name = null, $connection_name = self::DEFAULT_CONNECTION)
    {
        self::$_query_cache = array();
        if (isset(self::$_config[$connection_name]['clear_cache']) and is_callable(self::$_config[$connection_name]['clear_cache'])) {
            return call_user_func_array(self::$_config[$connection_name]['clear_cache'], array($table_name, $connection_name));
        }
    }

 public static function clear_cache()
 {
     return \ORM::clear_cache();
 }