Description:
------------
Situation: The session array key is the same like the var name. 

After serialize() the argument is also serialized.




Reproduce code:
---------------
<?php
session_start();

$a[] = 'A';
$a[] = 'B';
$_SESSION['arr'] = $a;

echo '<pre>';
print_r($_SESSION['arr']);
$arr = serialize($_SESSION['arr']);
print_r($_SESSION['arr']);
echo '<br/>';
print_r($arr);
?>


Expected result:
----------------
Array
(
    [0] => A
    [1] => B
)
Array
(
    [0] => A
    [1] => B
)
a:2:{i:0;s:1:"A";i:1;s:1:"B";}

Actual result:
--------------
Array
(
    [0] => A
    [1] => B
)
a:2:{i:0;s:1:"A";i:1;s:1:"B";}
a:2:{i:0;s:1:"A";i:1;s:1:"B";}