php Xpath arrested by the site's content

<?php

$url = 'http://www.hao6v.com/gvod/zx.html';
$outPageTxt = file_get_contents($url);
$dom = new DOMDocument();
@$dom->loadHTML($outPageTxt);
$dom->normalize();
$xpath = new DOMXPath($dom);
$data = $xpath->query('//*[@id="main"]/div[1]/div/ul/li/a');
//取值方式一
foreach ($data as $val) {
	echo $val->nodeValue;
	echo '-------';
	echo 'http://www.hao6v.com/'.$val->getAttribute('href');
	echo '<br/>';
}