cookie question

[firelior]

Hi,
I was wondering, if I do login system with this code:
[code]
if(!isset($_COOKIE['password']) || !isset($_COOKIE['username'])){
exit("Wrong Username Or password");
}
[/code]
is it good to do this in every page?
so it will check if the user is logged in or not...or is there
another way to do this?
with session or something?

[onlyican]

You can place a session
when logging the user in, place a session
logged in user
YOu can do the same for coockies, just create on cookie, holding the username
and place that if there logged in