PHP操作xml代码

/*获取图片新闻列表*/
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();
}