DmitryDulepov\Realurl\Decoder\UrlDecoder::setLanguageFromQueryString PHP Method

    protected function setLanguageFromQueryString()
    {
        $language = GeneralUtility::_GP('L');
        if (MathUtility::canBeInterpretedAsInteger($language)) {
            $this->detectedLanguageId = (int) $language;
        }
    }