php应用xpath抽取网页超链接

php使用xpath抽取网页超链接

<?php$html=file_get_contents('http://www.163.com/');$doc=new DomDocument();$doc->loadHTML($html);$xpath=new DOMXpath($doc);foreach($xpath->query('//a/@href') as $node){        $link = $node->nodeValue;        echo $link . "\n";}?>