How Can I Efficiently Select DOM Elements by Class Name in PHP?

Obtaining DOM Elements by Class Name

This question revolves around extracting sub-elements from a DOM node based on their class names.

PHP DOM Approach

One method involves utilizing PHP DOM's capability to traverse the DOM via CSS selectors. To select elements by class name, employ the following syntax:

$nodes = $document->getElementsByClassName('class-name');

Xpath Selector Approach

Alternatively, you can leverage Xpath selectors:

//*[contains(@class, 'class-name')]

Zend_Dom_Query Approach

For more complex queries, consider utilizing Zend_Dom_Query, which supports CSS selector syntax:

$finder = new Zend_Dom_Query($html);
$nodes = $finder->query('*[class~="class-name"]');

Updated Xpath Version of CSS Selector

By modifying the CSS selector, we can obtain a more efficient Xpath equivalent:

[contains(concat(' ', normalize-space(@class), ' '), ' class-name ')]

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