But I don't know what might happen if you use setcookie() to expire a cookie and then use setcookie() later on to set the same cookie.
www.php.net/set_cookie :
In PHP 3, multiple calls to setcookie() in the same script will be performed in reverse order. If you are trying to delete one cookie before inserting another you should put the insert before the delete. In PHP 4, multiple calls to setcookie() are performed in the order called.
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