Description:
------------
$_SESSION does not keep results when assigned an array variable.

Reproduce code:
---------------
test1.php

<?php

session_start();

echo("<a href=\"{$_SERVER['PHP_SELF']}\">click</a>");
print_r($_SESSION);
$_SESSION = array('id' => 1, 'user' => 'test');

session_write_close();

?>

test2.php

<?php

session_start();

echo("<a href=\"{$_SERVER['PHP_SELF']}\">click</a>");
print_r($_SESSION);
$row = array('id' => 1, 'user' => 'test');
$_SESSION = $row;

session_write_close();

?>

test3.php

<?php

session_start();

echo("<a href=\"{$_SERVER['PHP_SELF']}\">click</a>");
print_r($_SESSION);
$row = array('id' => 1, 'user' => 'test');
$_SESSION = $row + array();

session_write_close();

?>


Expected result:
----------------
Test1.php: Works
Test2.php: Fails
Test3.php: Works

Actual result:
--------------
Test1: clickArray ( [id] => 1 [user] => test )
Test2: clickArray ( )
Test3: clickArray ( [id] => 1 [user] => test )