codeigniter check for user session in every contro

问题:

I have this private session in one of my controllers that checks if a user is logged in:

function _is_logged_in() {

   $user = $this->session->userdata('user_data');

   if (!isset($user)) { 
      return false; 
   } 
   else { 
      return true;
   }

}

Problem is that I have more than one Controller. How can I use this function in those other controllers? Redefining the function in every Controller isn't very 'DRY'.

Any ideas?

回答1:

Another option is to create a base controller. Place the function in the base controller and then inherit from this.

To achieve this in CodeIgniter, create a file called MY_Controller.php in the libraries folder of your application.

class MY_Controller extends Controller
{
    public function __construct()
    {
        parent::__construct();
    }

    public function is_logged_in()
    {
        $user = $this->session->userdata('user_data');
        return isset($user);
    }
}

Then make your controller inherit from this base controller.

class X extends MY_Controller
{
    public function __construct()
    {
        parent::__construct();
    }

    public function do_something()
    {
        if ($this->is_logged_in())
        {
            // User is logged in.  Do something.
        }
    }
}

回答2:

Put it in a helper and autoload it.

helpers/login_helper.php:

function is_logged_in() {
    // Get current CodeIgniter instance
    $CI =& get_instance();
    // We need to use $CI->session instead of $this->session
    $user = $CI->session->userdata('user_data');
    if (!isset($user)) { return false; } else { return true; }
}

config/autoload.php:

$autoload['helper'] = array('login');

Then in your controller you can call:

is_logged_in();

回答3:

You can achieve this using helper and CodeIgniter constructor.

1. You can create custom helper my_helper.php in that write your function

   function is_logged_in() {
     $user = $this->session->userdata('user_data');
     if (!isset($user)) { 
      return false; 
     } 
    else { 
      return true;
    }
   } 
   

2. In controller if its login.php

   class Login extends CI_Controller {
   
       public function __construct()
       {
           parent::__construct();
           if(!is_logged_in())  // if you add in constructor no need write each function in above controller. 
           {
            //redirect you login view
           }
       }
   

回答4:

Get all user's data from session.

In the Controller,

$userData = $this->session->all_userdata();

In the View,

print_r($userData);

回答5:

I think using hooks is pretty easy. Just create a hook to check $this->session->user. It will be called in every request.

回答6:

Just add this on your folder core file ci_controller at function __construct() to check all controller ():

function __construct() 
{
    parent::__construct();
    if(! $user = $this->session->userdata('user_data');)
    {
         return false;
    }
}

回答7:

I coded like this according to above answers.. And this is running for me Create file my_helper.php

<?php 
    function _is_logged_in() {
        if(isset($_SESSION['username'])){
            return true;        
        } else {
            return false;
        }
    }
?>

Edit in autoload.php file

$autoload['helper'] = array('my');

In your Controller file

class Welcome extends CI_Controller {

    public function __construct(){
        parent::__construct();

        if(!_is_logged_in())  
        {
            redirect("Login");
        }
    }
}