php+xml编程之xpath的应用实例,xpath应用实例_PHP教程

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Release: 2016-07-13 10:09:05
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php+xml编程之xpath的应用实例,xpath应用实例

本文实例讲述了php+xml编程之xpath的应用。分享给大家供大家参考。具体如下:

xpath设计的核心思想:迅速定位到你所需要的元素(或者节点)。PHP 文件在载入xml文件和创建DOMDocument 对象后,就可以开始建立DOMXPath 对象。建立形式如下:

复制代码代码如下:
$xpath = new DOMXPath($xmldoc);

建立 DOMXPath 对象后,就可以开始使用 DOMXPath::query()方法,找到你需要的元素:

复制代码代码如下:
$item = $xpath->query("xpath路径表达式");//返回值为DOMNodList对象

实例:

xml文档:words.xml

复制代码代码如下:



boy
男孩


girl
女孩


teacher
老师


beauty
美女

xpath应用:index.php

复制代码代码如下:
$xmldoc = new DOMDocument();
//加载文件
$xmldoc->load("words.xml");
//使用xpath查询
$xpath = new DOMXPath($xmldoc);//创建DOMXPath对象
$node_list = $xpath->query("/words/word/ch");//查询ch这个元素,返回值为DOMNodeList对象
echo $node_list->item(0)->nodeValue;
?>

希望本文所述对大家的php+XML程序设计有所帮助。

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