Description:
------------
In php 5.0.4 and prior, this code snippet worked.  In php 5.0.5, it now returns an error.

A work around is to change the code to:

$obj = unserialize($data);
echo array_pop($obj);

Reproduce code:
---------------
<?

$data = serialize(array('test', 'test2'));
echo array_pop(unserialize($data));

?>


Expected result:
----------------
test2

Actual result:
--------------
Fatal error: Only variables can be passed by reference in /var/www/bountysource/public/test.php on line 4