PHP & MySQL User login and permissions system?

I would suggest you the logic as follows: if a user has "a" in one of his columns, then you treat him differently. That means that still one only row is coming up for every user. One only session.

Same data strusture. Same session. But basing on what is the value of, say, column "permissions" you open him more "doors" in your application.

Where everything you gonna have to do is to check if the "permission" of his session is set to "a" or whatever identifies him as admin.

First of all, you are using deprecated session_register,session_is_registered. Php manual recommends using $_SESSION. Session_is_registered expects string, but you don't pass string - it should be something like session_is_registered("admin"), not session_is_registered(admin).

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