public static function functions($showInternal = false)
    {
        if (!self::isDebug()) {
            return false;
        }

        $functions = get_defined_functions();
        if ($showInternal) {
            $functions = $functions['internal'];
            $type      = 'internal';
        } else {
            $functions = $functions['user'];
            $type      = 'user';
        }

        return self::i()->dump($functions, '! functions (' . $type . ') !');
    }