Description:
------------
Seems assignment-and-passing by reference becomes broken in PHP 5.1.

PHP 4.x and 5.0 work as expected. See sample below.

Seems PHP assigns value to $x AFTER calling function f(), but NOT before it. Or - only copy of $x passed to f(), not $x itself (as in 4.0 & 5.0).

Reproduce code:
---------------
<?php
function f(&$m)
{
	$m = 123;
}
f($x=0);
var_dump($x);
?>

Expected result:
----------------
int(123)

Actual result:
--------------
int(0)