帮忙看一个小函数不懂,该怎么处理

    function CreateStatus($status)
    {
        $root = $this->dom->createElement('root');
        $this->dom->appendChild($root);
        //创建status标签
        $statusInfo = $this->dom->createElement('status');
        $root->appendChild($statusInfo);
        $statusInfoValue = $this->dom->createTextNode($status);
        $statusInfo->appendChild($statusInfoValue);
        
        //