php XPath对XML文件查找及修改实现代码

<?php 
/* 
<?xml version="1.0" encoding="utf-8"?> 
<article> 
<item> 
<title name="t1">11</title> 
<content>content1</content> 
<pubdate>2009-10-11</pubdate> 
</item> 
<item> 
<title name="t2">title2</title> 
<content>content2</content> 
<pubdate>2009-11-11</pubdate> 
</item> 
</article> 
*/ 
if(!function_exists('l')) { 
function l() { 
echo '<br/>***********************************<br />'; 
} 
} 
if(file_exists('test10_12.xml')) { 
$xml = simplexml_load_file('test10_12.xml'); 

//利用xpath方法查找节点位置 
$query = $xml->xpath('//title[@name="t1"]/ancestor::item'); 

var_dump($query); 
l(); 

//测试在title节点下新增子节点new 
$query[0]->title->addChild('new','new'); 

//测试在title节点下新增属性fuck 
$query[0]->title->addAttribute('fuck','fuck you'); 

//测试修改content节点值为hello,world 
$query[0]->content = 'hello,world'; 

//不解释,你懂的 
$query[0]->asXML("10.xml"); 
} 
?>