php写XML文件编码错误，求解答
我有一个video的表，数据结构如下：
我利用如下程序读取表中文件，生成XML文件：
include("conn.php");
include("crop.php");
$xmlFile = "123.xml";
$dom = new DomDocument('1.0','utf-8');
$dom->formatOutput=true;
$thumbnails = $dom->createElement("thumbnails");
mysql_select_db('hdm0910283_db', $lnk) or die ('Can\'t use hdm0910283_db : ' . mysql_error());
mysql_query("SET NAMES utf-8");
$sql="select * from video";
$query=mysql_query($sql);
while ($row = mysql_fetch_array($query)) {
//切割youku截图
$imageurl="../workshow/images/".$row[imgname];
cutphoto("$imageurl","$imageurl",200,113);
$dom -> appendChild($thumbnails);
$thumbnail = $dom->createElement("thumbnail");
$thumbnail->setAttribute('filename', $row[imgname]);
$thumbnail->setAttribute('label', $row[title]);
$thumbnail->setAttribute('url', $row[url]);
$thumbnails -> appendChild($thumbnail);
}
$dom->save($xmlFile);
运行的时候提示如下错误：
arning: DOMElement::setAttribute() [domelement.setattribute]: string is not in UTF-8 in D:\AppServ\www\rj\control\xml_do.php on line 20
Warning: DOMDocument::save() [domdocument.save]: output conversion failed due to conv error, bytes 0xCA 0xD3 0xC6 0xB5 in D:\AppServ\www\rj\control\xml_do.php on line 24
我测试过表中数据插入和读出均无问题，请高手帮助解决。
