How to root permissions effectively? (CI 3.11)

I don’t see why all the controllers extends the level underneath them (admin -> mod -> user...). Why can’t they just extend your CommonController?

In an old CI3 project I made some time ago, my approach was a library to deal with the user’s authorization. The user’s info are in the session. The constructor in the common controller call a function from that lib to see if the user is logged in and has the right permission. If not it redirect to the login page or an error page.

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