DOMNode::isEqualNode() is incorrect when attribute order is different

[JoshyPHP]

Description

The spec says: "If A is an element, each attribute in its attribute list has an attribute that equals an attribute in B’s attribute list." The order in which the attributes are listed should not matter.

I double checked the expected behaviour in Gecko/Blink just in case.

<?php

$dom = new DOMDocument;

// <x a="a" b="b"/>
$el1 = $dom->createElement('x');
$el1->setAttribute('a', 'a');
$el1->setAttribute('b', 'b');

// <x b="b" a="a"/>
$el2 = $dom->createElement('x');
$el2->setAttribute('b', 'b');
$el2->setAttribute('a', 'a');

var_dump($el1->isEqualNode($el2));

Resulted in this output:

bool(false)

But I expected this output instead:

bool(true)

PHP Version

PHP 8.3.1

Operating System

No response