根据类或 id 获取图像的 src 属性 [英] get src attribute of an image based on class or id

问题描述

我想根据类或 id 获取图像中的 src.前任.在 html 页面上有很多 <img src="url"> 但只有一个有一个类或 id:如何获得具有特定类或 id 的正确 src 属性?请不要使用正则表达式

I want to get src in image based on class or id. Ex. On html page there are many <img src="url"> but only one have a class or id: <img src="url" class="image" or id="image"> How to get right src attribute wich have a specific class or id? Pls regex not dom

我将向您解释为什么我不想使用 dom 或其他库，因为我从其他站点获取 html 页面，该页面不允许 fopen 或 _file_get_contents 或 DOM 但只有 Curl 可以这样做.我当然有理由不使用像 simplehtmldom 这样的库，因为有时无法获取远程 html 页面，我应该自己制作一些脚本.

I gonna explain you why I dont want to use dom or other libraries because I'm getting a html page from an other site which not allow fopen or _file_get_contents or DOM but only Curl could do this. Sure I have a reason why I not use these libraries like simplehtmldom because sometimes is impossible to get remote html page and I should make by myself some scripts.

推荐答案

你说你不想使用 DOM 库，因为你需要使用 cURL.没关系——DOMDocument 和 simple_xml_load_string 都采用字符串参数.因此，您可以从 cURL 获取字符串并将其加载到您的 DOM 库中.

You say that you don't want to use DOM libraries because you need to use cURL. That's fine -- DOMDocument and simple_xml_load_string both take string arguments. So you can get your string from cURL and load it into your DOM library.

例如:

$html = curl_exec($ch); // assuming CURLOPT_RETURNTRANSFER

$dom = new DOMDocument;
$dom->loadHTML($html); // load the string from cURL into the DOMDocument object

// using an ID
$el = $dom->getElementById('image');

// using a class
$xpath = new DOMXPath($dom);
$els = $xpath->query('//img[@class="image"]');
$el = $els->item(0);

$src = $el->getAttribute('src');

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