简单的xpath查询不起作用 [英] simple xpath query not working

问题描述

此代码段不起作用：

Notice: Trying to get property of non-object in test.php on line 13

但是xpath查询显然是正确的...并且提供的url显然有一个标记。
我试图用 // html替换查询，但是没有运气。
我总是使用xpath，这是一个奇怪的行为。

but the xpath query seems obviously correct... and the url provided obviously have a tag . I tried to replace the query even with '//html' but no luck. I always use xpath and this is a strange behaviour.

<?php
$_url = 'http://www.portaleaste.com/it/Aste/Detail/876989';

$ch2 = curl_init();
curl_setopt($ch2, CURLOPT_URL, $_url);
curl_setopt($ch2, CURLOPT_RETURNTRANSFER, true);
$result2 = curl_exec($ch2);
curl_close($ch2);

$doc2 = new DOMDocument();
@$doc2->load($result2);
$xpath2 = new DOMXpath($doc2);
$txt = $xpath2->query('//p[@id="descrizione"]')->item(0)->nodeValue;
echo $txt;
?>

推荐答案

xpath查询没有问题正确的语法，并且该节点确实存在。有问题的行是这样的：

There is nothing wrong with your xpath query as it is correct syntax and the node does exist. The problematic line is this:

@$doc2->load($result2);
// DOMDocument::load — Load XML from a file

加载XML您从curl请求正确获得的结果页。要加载响应，

You are not loading the result page that you got from your curl request properly. To load the response,

请改用此命令：

@$doc2->loadHTML($result2);
// DOMDocument::loadHTML — Load HTML from a string

这是您期望的示例输出

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