Destroying a session with $_SESSION

Closing and destroy to session in PHP, is a hurt for me brain with this but I found the solution for it's works

//<?

// Initialize the session.

// If you are using session_name("something"), don't forget it now!

//session_start();

// Unset all of the session variables.

//$_SESSION = array();

// If it's desired to kill the session, also delete the session cookie.

// Note: This will destroy the session, and not just the session data!

//if (ini_get("session.use_cookies")) {

//    $params = session_get_cookie_params();

//    setcookie(session_name(), '', time() - 42000,

//        $params["path"], $params["domain"],

//        $params["secure"], $params["httponly"]

//    );

//}

// Finally, destroy the session.

//session_destroy();

//echo "<meta http-equiv='refresh' content='2; url=index.php?cod=2' />";

//?>