SimpleXML infinite loop when a cast is used inside a foreach

[nielsdos]

Description

The following code:

<?php

$xml = "<root><a>1</a><a>2</a></root>";
$xml = simplexml_load_string($xml);

$a = $xml->a;

foreach ($a as $test) {
    var_dump((string) $a->current());
    var_dump((string) $a);
}

Resulted in this output:
an infinite loop

But I expected this output instead:

string(1) "1"
string(1) "1"
string(1) "2"
string(1) "1"

I think at least, because $a always refers to the first element implicitly, and only current points to the current iterated-over item?

This is basically the same as #12192, but triggered in a different yet similar way.

PHP Version

PHP 8.1+

Operating System

Linux