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<?php $html = '<div id="one-id" class="someClassName">Some text <a href="#" title="Words" id="linkId" class="classLink">link</a> with only the class and id attrtibutes.</div>'; $dom = new DOMDocument(); $dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); foreach ($dom->getElementsByTagName('*') as $node) { for ($i = $node->attributes->length - 1; $i >= 0; --$i) { $attr = $node->attributes->item($i); if (!in_array($attr->name, ['id', 'class'])) { $node->removeAttribute($attr->name); } } } echo $dom->saveHTML();
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
<div id="one-id" class="someClassName">Some text <a id="linkId" class="classLink">link</a> with only the class and id attrtibutes.</div>

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