PHP DOMDocument：如何选择特定标记下的所有链接 [英] PHP DOMDocument : how to select all links under a specific tag

问题描述

我刚开始使用php DOMDocument，但遇到了一些麻烦。
我将如何选择特定节点下的所有链接节点

I'm just getting started with using php DOMDocument and am having a little trouble. How would I select all link nodes under a specific node lets say

在jquery中我可以简单地执行。.$（'h5> a'）
，这将为我提供h5下的所有链接。

in jquery i could simply do.. $('h5 > a') and this would give me all the links under h5.

我将如何使用DOMDocument方法在php中做到这一点？
我尝试使用 phpquery ，但由于某种原因，它无法读取html页面我正在尝试解析。

how would i do this in php using DOMDocument methods? I tried using phpquery but for some reason it can't read the html page i'm trying to parse.

推荐答案

据我所知，jQuery将选择器查询重写为XPath。

As far as I know, jQuery rewrites the selector queries to XPath. Any node jQuery can select, XPath also can.

h5> a 表示选择任何直接父节点为 h5 的 a 节点。可以轻松地将其转换为XPath查询： // h5 / a 。

h5 > a means select any a node for which the direct parent node is h5. This can easily be translated to a XPath query: //h5/a.

因此，使用DOMDocument：

So, using DOMDocument:

$dom = new DOMDocument;
$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
$nodes = $xpath->query('//h5/a');

foreach ($nodes as $node) {
   // do stuff
}

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