Filters & Helper Controller load

Well, I solved my problem by using a library that does the different tests. And i call my library in my filter.

In fact, in Codeigniter, I always have trouble understanding where to put my methods. Between services, helpers, libraries... It's never very clear in my head.

Create self layer service. 
UserController->show($user_id) init $UserService
This run $UserService->getUser($user_id) with some function, helper, libraries, model..
In service use $UserModel->find($user_id)
Profit!
In controller one line: 

PHP Code:

$user = $UserService->getUser($user_id) 


Next step, use this service method in other controller types: api, cli. Anywhere one line reuse for get User