How to upgrade CodeIgniter 2.X to 3.0?

You also need to check the app folder files beacause a lot of them had changed also.

The Sessions also change in CodeIgniter 3 so make sure you copy the new session folder over also.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )