Contao\Template::__call PHP Method

    public function __call($strKey, $arrParams)
    {
        if (!isset($this->arrData[$strKey]) || !is_callable($this->arrData[$strKey])) {
            throw new \InvalidArgumentException("{$strKey} is not set or not a callable");
        }
        return call_user_func_array($this->arrData[$strKey], $arrParams);
    }