Internal iterator functions can't handle UNDEF properties

[YuanchengJiang]

Description

The following code:

<?php
$dom = Dom\HTMLDocument::createFromString("<p>foo</p>", LIBXML_NOERROR);
$child = $dom->documentElement->appendChild($dom->createElement('html'));
$fusion = $child;
var_dump(reset($fusion));

Resulted in this output (JIT 1205):

/php-src/main/spprintf.c:376:14: runtime error: member access within null pointer of type 'zend_string' (aka 'struct _zend_string')

PHP Version

nightly

Operating System

ubuntu 22.04

[nielsdos]

Similar issue to that simplexml bug most likely.
Reduced to the following, which also works on 8.2:

<?php
$dom = new DOMDocument;
$child = $dom->appendChild($dom->createElement('html'));
var_dump(reset($child));

[nielsdos]

Actually, it's more broad than only DOM.
The reason it fails for DOM is because the get_properties handler is not implemented, returning an array of undef zvals.

However, the following fails too:

class X {
	public int $a;
}

$x = new X;
var_dump(reset($x));
var_dump(current($x));
var_dump(end($x));