- var_dump: documentation ( source)
<?php declare(strict_types = 1);
$document = new DOMDocument();
$document->loadXML('<x a="foo"/>');
/** @var DOMElement $element */
$element = $document->documentElement;
$attribute = $element->getAttributeNode('a');
$element->removeAttributeNode($attribute);
var_dump($document->saveHTML());