session_start();
$_SESSION['id'] = 98321;
$_SESSION['user'] = "chewbacca";
echo $_SESSION['id'] . "<br>";
echo $_SESSION['user'] . "<br>";
session_unset();
echo $_SESSION['id'];
echo $_SESSION['user'];
/*
run:
Undefined index: id in C:\xampp\htdocs\website\test.php on line 559
Undefined index: user in C:\xampp\htdocs\website\test.php on line 560
*/