Xpath 在解析基本 html 时不适合我 [英] Xpath not behaving for me in parsing basic html

问题描述

我正在尝试使用 xpath 解析一些基本的 html 并遇到问题.使用我正在阅读的 xpath 文档所说的工作，返回的输出始终为空.下面是我第一次尝试做这项工作.一如既往地感谢任何帮助.

I am trying to parse some basic html using xpath and running into issues. The returned output is always empty using what I am reading the xpath docs to say works. Below is my first attempt at making this work. Any help is appreciated as always guys and gals.

$html  = '<ul>';
$html .= '  <li id="stuff-12345"> some content here </li>';
$html .= '  <li id="stuff-54321"> some other content here </li>';
$html .= '</ul>';

    $dom = new DOMDocument(); 
    $dom->loadHTML($html);  
    $xpath = new DOMXPath($dom); 
    $result = $xpath->query('//ul/li'); 
    foreach($result as $e){
        echo $e->item(0)->nodeValue . "\n";
    }

推荐答案

DOMXPath::query 返回一个 DOMNodeList.当你在做

DOMXPath::query returns a DOMNodeList. When you are doing

foreach($result as $e){

您正在遍历 DOMElement 项和 DOMNodeList.DOMElement 没有 item() 方法.只有 DOMNodeList 有.试试

you are iterating over the DOMElement items a DOMNodeList. DOMElement does not have an item() method. Only DOMNodeList has that. Try with

foreach($result as $e){
    echo $e->nodeValue, PHP_EOL;
}

这篇关于Xpath 在解析基本 html 时不适合我的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！