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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2F'>php-8.4.5</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2FZend%2F'>Zend</a>/<a href='?path=%2Fbig%2FSRC%2Fphp-8.4.5%2FZend%2Ftests%2F'>tests</a>/</p><hr><h3>✏️ Editing: iterator_key_by_ref.phpt</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'>--TEST--
Iterator::key() with by-ref return
--FILE--
&lt;?php
class Test extends ArrayIterator {
    #[ReturnTypeWillChange]
    function &amp;key() {
        return $foo;
    }
}
foreach (new Test([0]) as $k =&gt; $v) {
    var_dump($k);
}
?&gt;
--EXPECT--
NULL
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