Having trouble making a PHP cookie stick

I'm trying to create a temporary login system for a site. I'm using cookies rather than a database as it is merely for FED testing but for some reason my cookies are not sticking :(

I know I'm posting fine because the header function works

if ($_POST['login'开发者_JAVA百科] == 1) {
    if (($user=="name") && ($pass=="secret")) {  
        setcookie("seeker", "1", time()+3600); 
        header('Location: ../index.php?');
    } else echo '<i>Incorrect username/password.</i>';
}

Try a full cookie setting with a larger expiry value:

setcookie('seeker', 1, time()+86400, '/', '.example.com');

The path setting may be the reason. If you're setting the cookie in a script in example.com/subdir/script.php, then the cookie will using /subdir as its path, and not show up for scripts running in different directories.

You should also consider using PHP Sessions. It will set the cookies for you automatically.