Piwik\DataTable\Renderer\Xml::areTableLabelsInvalidXmlTagNames PHP Метод

    private function areTableLabelsInvalidXmlTagNames($rowArray)
    {
        if (!empty($rowArray)) {
            foreach ($rowArray as $name => $value) {
                if (!self::isValidXmlTagName($name)) {
                    return true;
                }
            }
        }
        return false;
    }