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();
}