I have problem with set cookie in codeigniter

[eluser]Narf[/eluser]
... and it's not PHP's problem either. Thats simply how cookies work:

Step 1: HTTP Client <request> HTTP Server
Step 2: HTTP Server <response> HTTP Client

This happens every time you visit a web page. When you call setcookie(), the cookie is sent in Step 2 as a part from the server's response. However, a cookie must be sent by the client (your browser) in Step 1, so that it's data can be available to the server, which happens on your next page load.