Description:
------------
When I'm trying to use session_destroy() functioni n the __destruct() function, PHP says:
"Warning: Trying to destroy uninitialized session"

I'v tested the code under Apache and IIS, but all the same mistake.

Reproduce code:
---------------
<?php
class test
{
	function __construct() {
		echo 'Initialize the session.';
		session_start();
	}

	function __destruct() {
		session_destroy();
		echo 'Finally, destroy the session.';
	}
}

$test = new test();
?> 

Expected result:
----------------
Initialize the session.
Warning: session_destroy() [function.session-destroy]: Trying to destroy uninitialized session in D:\wwwroot\sess.php on line 10
Finally, destroy the session.