查找body节点的子节点
<?php
$note=<<<XML
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body><span>Important!</span> Don't forget me this weekend!</body>
</note>
XML;
$xml=simplexml_load_string($note);
foreach ($xml->body[0]->children() as $child)
{
echo "Child node: " . $child . "<br>";
}