CodeIgniter - How to check session to be used at every methods

Question

Let say at my controller named Book, I have many methods, such as get_book(); read_book(); remove_book();

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Answer 1

Create a file called MY_controller.php (the prefix can be edited in config file) in /application/core:

Then anytime you create a new controller, you decide what access it requires

    class Book extends Member_Controller {

        //Code that will be executed, no need to check anywhere if the user is logged in. 
        //The user is guaranteed to be logged in if we are executing code here.

//If you define a __construct() here, remember to call parent::__construct();
    }

This cuts code duplication a lot, since if you need another member controller other than Book you can just extend the Member_Controller. Instead of having to do the checks in all of them.