Cookies not working on different pages

Question

Ok I have a cookie set, and I can clearly see it if I go to private data in Firefox... ok so when I echo it on one page in a certain directory it works, (www.example.com/dir

Answer 1

setcookie('cookie_username', $cookie_username, time() + (86400 * 30), "/"); // 86400 = 1 day,  '/' denotes cookie available in entire directory.

and in another page:

$username = $_COOKIE['cookie_username'];

also make sure that browser is not blocking cookies.

If you want to use cookies in sub domain also:

setcookie('cookie_username', $cookie_username, time() + (86400 * 30), "/", ".subdomain.com"); // 86400 = 1 day,  '/' denotes cookie available in entire directory.