通过XPath查询XML中的数据

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我是靠谱客的博主俏皮小鸽子，最近开发中收集的这篇文章主要介绍通过XPath查询XML中的数据，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

一代码

<?php 
	class Message_XML extends DomDocument{
	private $Root;
	public function __construct() {
		parent:: __construct();
		$this->load("Rss.xml");}
public function select_message($Action){
	$Root  = $this->documentElement;
	$xpath = new DOMXPath($this);
	$node_Record = $xpath->query("//item[title='$Action']"); 
   	for($i=0;$i<$node_Record->length;$i++){		
	$g=0;
		foreach($node_Record->item($i)->childNodes as $node){
		 	$field[$g]=iconv("UTF-8","GB2312",$node->textContent);
			$g++;	}	
	print "<table width='750' height='75' border='1' cellpadding='1' cellspacing='1' bordercolor='#FFFFFF' bgcolor='#0099FF'>
  <tr>
    <td width='126' height='25' align='center'><span class='STYLE_select5'>标题</span></td>
    <td width='611'><input name='title' type='text' id='title' size='50' value='$field[0]'></td>
  </tr>
  <tr>
    <td height='25' align='center'><span class='STYLE_select5'>链接地址</span></td>
    <td><input name='link' type='text' id='link' size='60' value='$field[1]'></td>
  </tr>
  <tr>
    <td height='25' align='center'><span class='STYLE_select5'>内容摘要</span></td>
    <td><textarea name='description' cols='80' rows='5' id='description'>$field[2]</textarea></td>
  </tr>
</table>"; }	
  }
   }
?>
<title>查询XML文件</title>
<style type='text/css'>
<!--
.STYLE_select5 {font-size: 13px; font-weight: bold; color: #FFFFFF; }
-->
</style>
<style type="text/css">
<!--
body,td,th {
	font-size: 13px;
}
a:link {
	text-decoration: none;
}
a:visited {
	text-decoration: none;
}
a:hover {
	text-decoration: none;
}
a:active {
	text-decoration: none;
}
.STYLE2 {font-size: 18px}
-->
</style>
<body>
<table width=750 height=35 border=1 cellpadding=3 cellspacing=1 bordercolor="#FFFFFF" bgcolor="#0099FF">
  <form name="form1" method="post" action="index.php">
    <tr>
      <td height=35 align="center"><span class="STYLE_select5">请输入标题名称：</span>
        <input name="Action" type="text" id="Action">
      &nbsp;&nbsp;<input type="submit" name="Submit" value="提交">        </td>
    </tr>
  </form>
  <?php                                                                                                                      
	  if($_POST[Submit]==true){
		 $HawkXML = new Message_XML;   
		 $HawkXML->select_message(iconv("GB2312","UTF-8","$_POST[Action]"));	
	 }
?>
</table>
</body>

二运行结果