How to get username with sessions in codeigniter

Question

I'm making a very simple login autenthication with Codeigniter(3) with two simple fields , username and password. I'm very new with this and I'm having some problems. This is my controller to verify if the User has entered correct credentials:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class VerifyLogin extends CI_Controller {

 function __construct()
 {
   parent::__construct();
   $this->load->model('user','',TRUE);
   $this->load->helper('url');

 }

 function index()
 {
   //This method will have the credentials validation
   $this->load->library('form_validation');

   $this->form_validation->set_rules('username', 'Username', 'trim|required');
   $this->form_validation->set_rules('password', 'Password', 'trim|required|callback_check_database');

   if($this->form_validation->run() == FALSE)
   {
     //Field validation failed.  User redirected to login page
     $this->load->view('login_view');
   }
   else
   {
// session data

      $session_data = $this->session->userdata('logged_in');
     $data['username'] = $session_data['username'];
     $this->load->view('admin/dashboard', $data);

   }

     redirect(site_url('admin/dashboard'), 'refresh');


 }

 function check_database($password)
 {
   //Field validation succeeded.  Validate against database
   $username = $this->input->post('username');

   //query the database
    $result = $this->user->login($username, $password);

   if($result)
   {

     $sess_array = array();
     foreach($result as $row)
     {
       $sess_array = array(
         'id' => $row->id,
         'username' => $row->username
       );

       $this->session->set_userdata('logged_in', $sess_array);
     }
     return TRUE;
   }
   else
   {
     $this->form_validation->set_message('check_database', 'Invalid username or password');
     return false;
   }
 }
}
?> 

While the model user.php is this one:

function login($username, $password)
 {

$this -> db -> select('id, username, password');
$this -> db -> from('users');
$this -> db -> where('username', $username);
$this -> db -> where('password', $password);
$this -> db -> limit(1);

   $query = $this -> db -> get();

   if($query -> num_rows() == 1)
   {
     return $query->result();
   }
   else
   {
     return false;
   }
 }

When in my View I type Welcome <?php echo $username; ?> <?php echo $username; ?> I got undefined variable username. What I'm wrong?

Answer 1

Your session is working fine as per your comments, you just need to remove redirection, don't know why are you using?

Remove this line:

redirect(site_url('admin/dashboard'), 'refresh');