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<?php $html = <<<HTML <div class="image"> <img src="https://www.gravatar.com/avatar/" alt="test" width="50" height="50"> </div> HTML; $dom = new DOMDocument; $dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); $xpath = new DOMXPath($dom); // using a loop in case there are multiple occurrences foreach ($xpath->query("//div[contains(@class, 'image')]/img") as $node) { $node->setAttribute('data-mfp-src', $node->getAttribute('src')); } echo $dom->saveHTML();
Output for git.master, git.master_jit, rfc.property-hooks
<div class="image"> <img src="https://www.gravatar.com/avatar/" alt="test" width="50" height="50" data-mfp-src="https://www.gravatar.com/avatar/"> </div>

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