xpath php

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
$target_url = "http://www.crazyant.net/1973.html"; $ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$target_url);
curl_setopt($ch, CURLOPT_FAILONERROR, true);
//curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_AUTOREFERER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
$html = curl_exec($ch); if (!$html) {
echo "<br />cURL error number:" .curl_errno($ch);
echo "<br />cURL error:" . curl_error($ch);
exit;
} //创建一个DomDocument对象,用于处理一个HTML
$dom = new DOMDocument();
//从一个字符串加载HTML
@$dom->loadHTML($html);
//使该HTML规范化
$dom->normalize();
//*[@id="post-1980"]/div/header/h2/a
//用DOMXpath加载DOM,用于查询
$xpath = new DOMXPath($dom);
#获取所有的a标签的地址
$hrefs = $xpath->evaluate("/html/body//a//@href"); for ($i = 0; $i < $hrefs->length; $i++) {
$href = $hrefs->item($i);
$linktext = $href->nodeValue;
echo $linktext;
echo "<br />"; }
?>

  

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