Description:
------------
when using serialize on some large (not huge) array, it will take insane
amounts of memory.
look at the code , when using size array of 30,000 , the script works
as expected, indicating that the output is a mere 2MB in length,
while enlarging the array to 50,000 elements causes php to go crazy and
hit the 600MB i've allowed him to consume...


Reproduce code:
---------------
<?
$a = array();

for($i=0;$i<50000;$i++)
{
        $a[$i] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
}

$z = serialize($a);
print strlen($z);
?>