public static function get($key, $secondKey = false)
    {
        self::setPrefix();

        if ($secondKey == true) {

            if (isset($_SESSION[self::$_sessionPrefix . $key][$secondKey])) {
                return $_SESSION[self::$_sessionPrefix . $key][$secondKey];
            }

        } else {

            if (isset($_SESSION[self::$_sessionPrefix . $key])) {
                return $_SESSION[self::$_sessionPrefix . $key];
            }

        }

        return false;
    }