Description:
------------
I have confirmed that I have writable access to my session save path, but session variables are still not saved.



Reproduce code:
---------------
ini_set("session.save_path","C:\\WINDOWS\\temp");

session_start();

echo (($sp=ini_get('session.save_path'))?$sp:'Not set<br>'); 
echo is_writable($sp) ? ' writable<br>':' not writable<br>';

if (!isset($_SESSION['count'])) {
	$_SESSION['count'] = 0;
	}
else {
	$_SESSION['count']++;
	}
	
echo $_SESSION['count'];
?>



Expected result:
----------------
c:\windows\temp writable
0, 1, 2, 3 , 4...


Actual result:
--------------
c:\windows\temp writable
0, 0, 0, 0, 0...