note 24457 deleted from function.unset by sniper

Note Submitter: till.krullmann@gmx.net ---- [Editor's note: this note is partially correct, you can destroy session a variable using session_unregister(), and then you can safely unset() it.] If you unset session variables with unset($_SESSION['foo']) the variables will only be unset from the $_SESSION array inside the calling script. Calling isset($_SESSION['foo']) on the next page will return true! It seems that it is impossible to delete only certain session variables permanently. You can, however, delete all variables with session_unset().