PHP registerXPathNamespace()函数讲解

<?php 
$xml=<<<XML
<book xmlns:chap="http://example.org/chapter-title"  
<title My Book</title  
<chapter id="1"  
<chap:title Chapter 1</chap:title  
<para Donec velit. Nullam eget tellus...</para  
</chapter  
<chapter id="2"  
<chap:title Chapter 2</chap:title  
<para Lorem ipsum dolor sit amet....</para  
</chapter  
</book  
XML;
$sxe=new SimpleXMLElement($xml); 
$sxe- registerXPathNamespace('c','http://example.org/chapter-title'); 
$result=$sxe- xpath('//c:title'); 
foreach ($result as $title) 
{ 
echo $title . "<br "; 
} 
? 

registerXPathNamespace( _prefix_ , _ns_ );