how to make logout in php code example

Example 1: logout in php

<?php
if(isset($_GET['logout'])) {
    session_destroy();
    unset($_SESSION['uname']);
    header('location:login.php');
}
?>

Example 2: logout in php

if(isset($_GET['logout'])) {
    session_destroy();
    unset($_SESSION['username']);
    header('location:login.php');
}