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Thanks for your response!
I see what you are saying...
maybe I can get the functionality I want by creating helper functions and then calling them from within the twig. I will try that.

I know a few solutions. One is HMVC.
Another is widgets: https://github.com/kenjis/codeigniter-widgets

If you really need to call another controller, I don't recommend to use HMVC.
Because it brings complexity to CodeIgniter. But HMVC is very popular library for CodeIgniter.

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