Visitor::acceptedLanguageCode PHP Метод

    public static function acceptedLanguageCode()
    {
        if (!is_null(static::$acceptedLanguageCode)) {
            return static::$acceptedLanguageCode;
        }
        $detected = explode(',', static::acceptedLanguage());
        $detected = explode('-', $detected[0]);
        return static::$acceptedLanguageCode = strtolower($detected[0]);
    }