The Cookie class allows you to get, set and delete cookies.
item
Get cookie item.
cookie::item('username');
cookie::item('username', 'guest'); // return 'guest' if 'username' index doesn't exist
set
Create cookie.
cookie::set('username', 'john');
cookie::set('username', 'john', 60*60*24); // expiration in seconds
delete
Delete cookie item.
cookie::delete('username');
cookie::delete(array('user_id', 'username'));