--TEST--
Bug #72051 (The reference in CallbackFilterIterator doesn't work as expected)
--FILE--
<?php

$data = [
    [1,2]
];

$callbackTest = new CallbackFilterIterator(new ArrayIterator($data), function (&$current) {
    $current['message'] = 'Test message';
    return true;
});

$callbackTest->rewind();
$data = $callbackTest->current();
$callbackTest->next();
print_r($data);
?>
--EXPECTF--
Warning: {closure}(): Argument #1 ($current) must be passed by reference, value given in %s on line %d
Array
(
    [0] => 1
    [1] => 2
)