Description:
------------
When keeping copyies of $_SESSION array its values are copied as references.

Bug has found in version 4.4.2 (FreeBSD)
In version 4.3.10 (Windows) this work correctly.

Reproduce code:
---------------
<?php
session_start();
$test_array = array();

$_SESSION['var'] = 'first';
$copy1 = $_SESSION;

$_SESSION['var'] = 'second';
$copy2 = $_SESSION;

var_dump($copy1);
var_dump($copy2);
?>

Expected result:
----------------
array(1) {
  ["var"]=>
  string(5) "first"
}
array(1) {
  ["var"]=>
  string(6) "second"
}

Actual result:
--------------
array(1) {
  ["var"]=>
  &string(6) "second"
}
array(1) {
  ["var"]=>
  &string(6) "second"
}