Needed: Summary of Security and Sessions versus standard PHP

[eluser]Lick[/eluser]
LoginPage:

Code:

class MyLoginPage extends Controller {

   function MyLoginPage () {
      parent::Controller();

      $this->load->library('session'); // use this or Auto-Load

      if ( /* valid user login */ ) {
          $this->session->set_userdata('logged_in', TRUE);
      }
   }
  
   ...
}

SecretPages:

Code:

class MySecretPage extends Controller {

   function MySecretPage() {
      parent::Controller();

      $this->load->library('session'); // use this or Auto-Load

      if ($this->session->userdata('logged_in') !== TRUE) {
          redirect(site_url());
      }
   }
  
   ...
}

I'm pretty new to CodeIgniter so this might totally not work, at all.