SimpleXML infinite loop when getName() is called within foreach

[nielsdos]

Description

The following code:

<?php

$xml = "<root><a/><a/></root>";
$xml = simplexml_load_string($xml);

$a = $xml->a;

foreach ($a as $test) {
    var_dump($a->key());
    var_dump($a->getName());
}

Resulted in this output:
an infinite loop

But I expected this output instead:

string(1) "a"
string(1) "a"

This happens because getName() resets the iterator to the start. It should be fixed by restoring the iterator after fetching the name...

PHP Version

At least 8.1+, probably a very old bug

Operating System

Linux