log out no me cierra session

[jonysi_d]

deberia quedar asi ???


if ((isset($_GET['doLogout'])) &&($_GET['doLogout']=="true")){
//to fully log out a visitor we need to clear the session varialbles
$_SESSION['MM_Username'] = NULL;
$_SESSION['MM_UserGroup'] = NULL;
$_SESSION['PrevUrl'] = NULL;
unset($_SESSION['MM_Username']);
unset($_SESSION['MM_UserGroup']);
unset($_SESSION['PrevUrl']);


$logoutGoTo = "../index.php";
if ($logoutGoTo) {
header("Location: $logoutGoTo");
exit;
}
}


?>
<?php
session_start();
session_unset();
session_destroy();
?>