Description:
------------
If i put values in $_SESSION array by inserting them as array elements such as this:

$_SESSION["a"]="test";

All does function ok; but if i prepare a whole array of values and put it in the session such as this:

$prep=array("test1","test2","test3","test4");
$_SESSION=$prep;

NOTHING gets written in the session, and any subsequest pages loading the session will get an empty session array.

Reproduce code:
---------------
This writes the session
<?php
	session_start();
	$tize=array("uno","due","tre","quattro","cinque","sei");
	$_SESSION=$tize;
	print_r($_SESSION);
?>

This tries to read the session:
<?php
	session_start();
	print_r($_SESSION);
?>

Expected result:
----------------
Output the content of $tize array!

Actual result:
--------------
Outputs an empty array!