php设置会话与cookie

Question

$_SESSION['user_id'] = $login;  
setcookie('user_id', '$login' , time()+86000);
header('Location: userindex.php');

function logged_in() {
return (isset($_SESSION['user_id']) || isset($_COOKIE['user_id']) ? true : false;
}

I have SESSION but I wonna include COOKIE too but I don't know how to restart SESSION with COOKIE. I don't have a idea how I can get that. I create COOKIE but can't logout and have problem with SESSION somebody can help me to fix my problem???? And in every page on top I have logged_in function for check if user is logged in or not I wonna these logged_in function to check if user has cookie to auto login to user cookie. I think it is in logged_in function must get write some code and...

Answer 1

I will note that this is not secure, as any one can create the cookie, using something like firebug.

@session_start();

function logged_in() {
    if(!isset($_SESSION['user_id']) && isset($_COOKIE['user_id'])) {
        $_SESSION['user_id'] = $_COOKIE['user_id'];
    }
    return isset($_SESSION['user_id']);
}

function logout() {
    unset($_SESSION['user_id']);
    setcookie("user_id", "", time() - 3600);
    header("Location: http://".$_SERVER['HTTP_HOST']);
    exit;
}

Edit: Added logout() - will remove both session and cookie 'user_id', then redirect to homepage