generating cookie

Hi
How can I generate a secure cookie that expires in 30 days
I want to set this cookie for coding an affiliate program
There are tutorial for setting cookies in different methods but I posted this thread to find the most secure.
and what should i store in that cookie? user id? username? what's your suggestion?
thanks

 

www.php.net/setcookie

There are a lot of examples. As for your other question, it doesn't matter I guess, but I'd use the user ID rather than the user name.

 

setcookie('userid', '$USER ID', '(60*60*24*30)', '.YOUR DOMAIN.co.uk', true);

PHP:

that should do it

 

^ Should, but won't.

Variables don't go between single quotes. Neither do mathematical expressions.

 

it was done quick to give the idea i missed out the curly braces.. .