Something
public php v1 · immutable<?phpsession_start();define('SELF', basename(__FILE__));if (isset($_SESSION['login'])) { echo 'Witaj ' . $_SESSION['login'] . '<br /> <a href="' . SELF . '?wyloguj=1">Wyloguj</a>';} elseif (isset($_GET['wyloguj'])) { session_destroy();} else { if (isset($_POST['login'])) { $_SESSION['login'] = $_POST['login']; header('Location: ' . SELF); } else { echo '<form action="' . SELF . '" method="post"> <input type="text" /> <input type="submit" value="Zaloguj" /> </form>'; }}?>