PHP操作xml

/*擷取圖片新聞列表*/function getPicNews($number=5){    require_once 'include/content_class.php';    $Content=new Content();    $sql='select contentid as id,title,pic,typeid from `cms_content` where pic<>"" order by input_time desc';    $rows=$Content->getRowsBySQL($sql,$number);    $dom=new DOMDocument('1.0','GBK');    $root=$dom->createElement('slider');    $dom->appendChild($root);    foreach($rows as $val){      $item=$dom->createElement('item');      $root->appendChild($item);           $title=$dom->createAttribute('title');      $title_text=$dom->createTextNode($val['title']);      $title->appendChild($title_text);      $item->appendChild($title);      $href=$dom->createAttribute('href');      $href_text=$dom->createTextNode('show.php?newsid='.$val['id'].'&classid='.$val['typeid']);      $href->appendChild($href_text);      $item->appendChild($href);      $imageurl=$dom->createAttribute('imageurl');      $imageurl_text=$dom->createTextNode($val['pic']);      $imageurl->appendChild($imageurl_text);      $item->appendChild($imageurl);    }    return $dom->saveXML();}