php - Using DOMDocument to extract from HTML document by class

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php - Using DOMDocument to extract from HTML document by class

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

In the DOMDocument class there are methods to get elements by by id and by tag name (getElementById & getElementsByTagName) but not by class. Is there a way to do this?

As an example, how would I select the div from the following markup?

<html>
...
<body>
...
<div class="foo">
...
</div>
...
</body>
</html>

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1 Answer

深蓝 · Answer 1 · 2021-10-23T19:39:46+0000

The simple answer is to use xpath:

$dom = new DomDocument();
$dom->loadHtml($html);
$xpath = new DomXpath($dom);
$div = $xpath->query('//*[@class="foo"]')->item(0);

But that won't accept spaces. So to select by space separated class, use this query:

//*[contains(concat(' ', normalize-space(@class), ' '), ' class ')

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