php读xml

php文件

<?php
 class xpathExtension{
   public static function getNodes($domDoc, $xpathString) {
        $xp = new DOMXPath($domDoc);
        $xp->registerNamespace('x', 'http://www.w3.org/1999/xhtml');
        $xp->registerNamespace('xhtml', 'http://www.w3.org/1999/xhtml');
        $xp->registerNamespace('i18n', 'http://apache.org/cocoon/i18n/2.1');

        $ret = array();
        $nodes = $xp->query($xpathString);
        foreach ($nodes as $node) {
            array_push($ret, $node);
        }
        return $ret;
    }
}
$domDoc = new DOMDocument();
$domDoc->load("x1.xml");
$xpathString = "//xml/products/product/description";
$domNodeList = xpathExtension::getNodes($domDoc, $xpathString);
//echo count($domNodeList);
foreach($domNodeList as $domNode){
   echo $domNode->nodeValue;
}

?>

xml

<?xml version="1.0" encoding="utf-8" ?>
<xml>
  <products>
    <product>
        <description>
            abcd
        </description>
    </product>
  </products>
</xml>