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

You don't necessarily need to do that. Simply put the login check code in the constructor and you're all set!

class Book extends CI_Controller
{
    public function __construct()
    {
        if ($this->is_logged_in())
        {
            // redirect to home
        }
    }

    public function get_book()
    {
        ...
    }

    // The rest of the code...
}