Description:
------------
Redeclare makes my apache2 hang with php 5.1.2

I heard of others that their 5.1.2 CLI bailed out with a SIGSEGV.

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

class foobar extends ArrayObject
{
    public function count()
    {
        return count($this);
    }
}

$foobar = new foobar();
$foobar[] = 1;
$foobar[] = 2;
$foobar[] = 3;

echo $foobar->count();

?>

Expected result:
----------------
3