> (c)  Obviously, this won't prevent someone from
>     faking a username via the querystring, so you have to
>     specify that it's a cookie:
>     if(!isset($_COOKIE["username"])) {
>         header("Location: http://www.mysite.com/login.php";);
>         exit;
>     }

Note that nothing prevents users from faking a username via their own
cookie either.


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