Help w/ Codeigniter __construct()

I'm checking if a user is logged in. If they are I开发者_JAVA技巧 want to set some variables that will be available to all my functions in that class here is the code thus far. Calling $logged_in or $user_name from my view results in an undefined variable? Please help :)

<?php
class Auth extends Controller {

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

$this->load->library('form_validation');
$this->load->model('Auth_model');

  if ($this->session->userdata('logged_in') == TRUE)
  {
  $this->user_name = $this->session->userdata('user_name');
  $this->logged_in = TRUE;
  }
  else
  {
  $this->logged_in = FALSE;
  }
}


function forgot()
{  
$data['title'] = "Forgot Password";
$data['main_content'] = "auth/forgot";

$this->load->view('template', $data);
}

    /* My view file */

    <?php echo $user_name; // results in undefined variables ?>

---

It is because you have passed $data in the view and $data does not contain $user_name

Just befor loading your view you should do something like below so that these variables are available in the view.

$data['user_name'] = $this->user_name;
$data['logged_in'] = $this->logged_in.
$this->load->view('template', $data);

Edit :

Declare $data as a global variable ie just before initializing constructor as shown below -

protected $data;

Then use $data as $this->data everywhere so if it is initialized with username in one function then it will be available in all functions too.

---

An even easier way to do this in your view, instead of using:

echo $user_name; // results in undefined variables

use:

$this->session->userdata('user_name') ? $this->session->userdata('user_name') : '';

In simple terms, the above statement checks if user_name is set in the session, and if it is, it displays the user_name straight from the session, or else displays blank. With this you will need to make sure that the session var user_name is destroyed once the user logs out.