Codeigniter重定向/加载视图

Question

I really want to understand whats the best use of both functions.

Controller: (After much processing, lets skip directly to creating the session)

$isLoggedin = array( 'user_name' => $row['username'] , 'user_type' => 'user' ,  'is_loggedin' => TRUE);
$this->session->set_user($isLoggedin); 
redirect('controller/index');

in the controller,

public function __construct()
{
parent::__construct();
    //should i check for the session here?
}

function index(){
 // or should i check here?
}

In the login controller, after creating the session, i passed it to the main controller, Before accessing the homepage, i want to verify if the session['is_loggedin'] == TRUE that signifies the session that was created = logged in.

My confusion is, since the constructor function is loaded first right everytime you call the controller. Please correct me if im wrong. So in the redirect in the log in controller, i shouldnt call the index?

should i just call the controller there then let the constructor handle, then in the constructor, like this.

public function __construct(){
parent::__construct();
if($session['is_loggedin'] == TRUE)
$this->load->view('homepage');
else
redirect('Login');
}

So i guess i wont need the index anymore right? Is it okay to call the controller that way? in the redirect, also do i have to pass the $session from controller to controller?

Answer 1

Use constructor to load common libraries and helpers which are needed for the other functions in that particular class. Index function works as a default function when there is no other function is mentioned. For example you can do like this

public function index(){
  $this->login();
}

public function login(){
  login code

}

so this way your base url/class name/ and base url/class name/ login both will work. If you autoload session library in your application/config/autoload.php file you don't need to worry about session, just you need to set an encryption key in config.php file

If you don't want to autoload session then you need to load session manually on every class's constructor where you need to maintain session.

Answer 2

You better check for the user if he has a logged in session in your constructor function before loading any libraries or helpers. but make sure session and database are loaded to check users login status. this can help you to prevent any other unauthorized access to the other functions and resources of your website, cause one might just type the name of some other functions into the URL directly!