Definition: Session_unset () is used to remove all variables in a session. You must first open a session to use session_unset (). You should use this function instead of unset($_session) to remove the entire session, to avoid problems with global variables. It should usually be used with session_destroy() to more thoroughly remove the session, if that is your goal.
Also Known As: Remove Session Variables
Examples:
<?php
// you have to open the session to be able to modify or remove it
session_start();
// or this would remove all the variable in the session
session_unset();
//destroy the session
session_destroy();
?>
