php写xml文档的一种简单方式

header("content-type:text/xml;charset=utf-8");
$xml = new SimpleXMLElement("<?xml version=\"1.0\" encoding=\"utf-8\" ?><UserInfo />");
//			$item = $xml->addChild('name','xxx');
foreach($userData as $key=>$val){
$item = $xml->addChild("user");
$user = $item->addChild('name',$val['name']);
$user = $item->addChild('pwd',$val['pwd']);

}
echo $xml->asXML();
$xml->asXML("User.xml");