These are chat archives for codeigniter-id/codeigniter-id.github.io
So if i am right i think there are two possible solutions:
you can let the one controller handle the information he gets and save them afterwards in an database. Than you just need to retrieve them by the other controller after redirecting to him.
first controller is handling the information and after finishing you open the next controller/method with arguments (redirect or something else). So without a db.
But which of both makes sense depends on what you want to do. I just can recommend to read the CI docs and focus on their logic so without that what you've done.