Description:
------------
I found it can not save integer variable in session.
e.g:
  $_SESSION['TEST'] = 'SOMETHING'  // OK
  $_SESSION[1]      = 'SOMETHING'  // ERROR

My environment: FreeBSD + PHP 4.3.2
I think it must be a BIG bug.

Reproduce code:
---------------
<?php
session_start();
print_r($_SESSION); // always can not print $_SESSION[1]

$_SESSION[1]      = 'TEST';
$_SESSION['TEST'] = 'MY TEST';
print_r($_SESSION);
?>

Expected result:
----------------
Result (after refresh):
Array ( )
Array ( [1] => TEST [TEST] => MY TEST )


The correct result should be:
Array ( [1] => TEST [TEST] => MY TEST )
Array ( [1] => TEST [TEST] => MY TEST )