give_cookie.php
i think the time you are setting is still in the past
currently
time() = 1348584550 100 * 60 * 60 * 24 * 30 = 259200000
so try
setcookie("muffin", "55", time() + (100 * 60 * 60 * 24 * 30)); if($_COOKIE["muffin"]) echo "open";