php操作XML、读取数据和写入数据的实现代码

<?xml version="1.0" encoding="utf-8"?>
 
<vip>
 <id>23</id>
 <username>开心的路飞</username>
 <sex>男</sex>
 <face>face/43.jpg</face>
 <email>[email protected]</email>
 <qq>1212121212</qq> 
</vip>
<?xml version="1.0"