关于php的数据库模查询疑问，拜托了

<?php
header('Content-Type: text/xml');
header("cache-control:no-cache,must-revalidate");
$xml="<?xml version='1.0' encoding='gb2312'?>";
$xml=$xml."<contents>";    

$name="北京";

$sql="select name from location where name like'".$name."%'";
mysql_query("SET NAMES gb2312");
$result=mysql_query($sql);

while($row =mysql_fetch_array($result))
{
   $content=$content."<name>"+$row['name']+"</name>";
}
$xml=$xml.$content."</contents>";
echo $xml;
mysql_close();
?>

$content=$content."<name>"+$row['name']+"</name>";
//修改为
$content .= "<name>{$row['name']}</name>";