XML（Extensible Markup Language）即可扩展标记语言,一般有效的XML文档是指通过了DTD的验证的，具有良好结构的XML文档,例如config.xml:

<slides>
 
  <slide>
   <url>/Public/Images/01.jpg</url>
   <link>http://www.peakglasses.com/about/48.html</link> 
  </slide>
  
  <slide>
   <url>/Public/Images/02.jpg</url>
   <link>http://www.peakglasses.com/about/48.html</link> 
  </slide> 
  
  <slide>
   <url>/Public/Images/03.jpg</url>
   <link>http://www.peakglasses.com/about/48.html</link> 
  </slide>   
  
  <slide>
   <url>/Public/Images/04.jpg</url>
   <link target=\"_blank\">http://www.peakglasses.com/about/48.html </link> 
  </slide>

 </slides>

以下PHP代码可读取其中的内容：

$xmlarr=simplexml_load_file(\'config.xml\');
//print_r($xmlarr);
foreach($xmlarr->slide as $slide){
 echo \"url is $slide->url\\n\";
 echo \"link is $slide->link\\n\";
 }