php 读取xml

<?php
$filename='test.xml';
$data=simplexml_load_file($filename);
if($data===false){
die("读取{$filename}文件失败");
}
$data=get_object_vars($data);
foreach ($data as $key => $v) {
if(is_object($v)){
$data[$key]=get_object_vars($v);
}
}
echo "<Pre>";
print_r($data);die;