<!--PHP编程实战-->
<!--XML -->
<!--14-9-->
<!--使用XPath匹配父与子-->
<?php
error_reporting(E_ALL);

$xml = <<<THE_XML
<animals>
    <dog>
        <name>snoopy</name>
        <color>brown</color>
        <breed>beagel cross</breed>
    </dog>
    <cat>
        <name>teddy</name>
        <color>brown</color>
        <breed>tabby</breed>
    </cat>
    <dog>
        <name>jade</name>
        <color>black</color>
        <breed>lab cross</breed>
    </dog>
</animals>
THE_XML;

$xml_object = simplexml_load_string($xml);

$names = $xml_object->xpath("*/name");
foreach ($names as $element) {
    $parent = $element->xpath("..");
    $type = $parent[0]->getName();
    echo "$element ($type)<br/>";
}
?>

使用XPath的*/name匹配<name>元素,而不考虑它是否被包含在<dog>或<cat>元素中.
使用查询..获取当前SimpleXMLElement的根.