public static function listOrderByKeys()
    {
        $classMethods = get_class_methods(get_class());
        $calledClassMethods = get_class_methods(get_called_class());

        $filteredMethods = array_filter(
            $calledClassMethods, function ($calledClassMethod) use ($classMethods) {
                return !in_array($calledClassMethod, $classMethods, true);
            }
        );

        $list = [];
        foreach ($filteredMethods as $k => $v) {
            $list[$v] = $v;
        }

        return $list;
    }