Setting Flash Data When Session Expire Codeigniter

Question

What is the best way to set flash data messages when session have timed out and then be able to get message on login page.

I have a warning variable that would like to use but can not seem to get it working with sessions timed out I have it redirecting to the login page one sessions have timed out.

But not sure best way to set flash data using my error array, any idea's.

Login Controller:

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

class Login extends MX_Controller {

   private $error = array();

   public function __construct() {
      parent::__construct();
      $this->load->library('user');
      $this->load->library('form_validation');
      $this->lang->load('common/login', 'english');
   } 

   public function index() {
      $this->form_validation->set_rules('username', 'Username', 'required|min_length[4]|max_length[12]');
      $this->form_validation->set_rules('password', 'Password', 'required|xss_clean');

      if($this->form_validation->run($this) == false) {

         $data['title'] = $this->lang->line('heading_title');

         $data['text_heading'] = $this->lang->line('text_heading');

         if (array_key_exists('warning', $this->error)) {
            $data['error_warning'] = $this->error['warning'];
         } else {
            $data['error_warning'] = '';
         }

         if (null !==($this->session->flashdata('message_name'), $this->error)) {
            $data['message'] = $this->session->set_flashdata('message_name', 'This is my message');
         } else {
            $data['message'] = '';
         }

         $this->load->view('common/login', $data);

      } else{ 

         if($this->validate()) {

             redirect('dashboard');

            } else {

               $data['title'] = $this->lang->line('heading_title');

               $data['text_heading'] = $this->lang->line('text_heading');

               if (array_key_exists('warning', $this->error)) {
                  $data['error_warning'] = $this->error['warning'];
               } else {
                  $data['error_warning'] = '';
               }

               if (null !==($this->session->flashdata('message_name'), $this->error)) {
                  $data['message'] = $this->session->set_flashdata('message_name', 'This is my message');
               } else {
                  $data['message'] = '';
               }

               $this->load->view('common/login', $data);

         }
      }
   }

   function validate() {
      $username = $this->input->post('username');
      $password = $this->input->post('password');

      if ($this->user->login($username, $password)) {
          return true;
      } else {
         $this->error['warning'] = $this->lang->line('error_login');
         return !$this->error;
      }
   }
}

Login View

<?php echo modules::run('common/header/index');?>

<div class="container">
<div class="row">
<div class="col-lg-6 col-lg-offset-3 col-md-4 col-md-offset-4 col-sm-offset-2 col-sm-8">
<div class="panel panel-default">
<div class="panel-heading"><h2 class="panel-title"><i class="fa fa-key"></i> <?php echo $text_heading; ?></h2></div>
<div class="panel-body">

<?php if ($error_warning) { ?>
    <div class="alert alert-danger"><i class="fa fa-exclamation-circle"></i> <?php echo $error_warning; ?>
        <button type="button" class="close" data-dismiss="alert">&times;</button>
    </div>
<?php } ?>

<?php echo form_open('login');?>

<div class="form-group">
    <div class="input-group"><span class="input-group-addon"><i class="fa fa-user"></i> </span>
    <input type="text" name="username" value="" placeholder="Username"  class="form-control" size="50" />
    </div>
    <?php echo form_error('username', '<div class="text-danger">', '</div>'); ?>
</div>

<div class="form-group">
    <div class="input-group"><span class="input-group-addon"><i class="fa fa-lock"></i></span>
        <input type="password" name="password" value="" placeholder="Password"  class="form-control"/>
        </div>
        <?php echo form_error('password', '<div class="text-danger">', '</div>'); ?>
    </div>
<div class="form-group">
    <div class="text-right">
        <button type="submit" class="btn btn-primary"><i class="fa fa-key"></i> Login</button>
    </div>
</div>

</form>

</div><!--/. Panel Body -->
</div><!--/. Panel Panel Default -->
</div>
</div>
</div>
<?php echo modules::run('common/footer/index');?>

Answer 1

set_flshdat is codeigniter function that will only be available for next server request and then automatically cleared. you can see in detail here flashdata and search for set_flashdata in this link

so if you need message after redirect to other page or same page

set flashdata on first requested controller page

$this->session->set_flashdata('message_name', 'This is my message');

and on second server request or your redirection page will get this flash data using below

echo $this->session->flashdata('message_name');

So, basically if you don't want to redirect page and want to load view

//set data in controller 
$data['message_name'] = 'This is my message'
//and pass this to view
$this->load->view('yourview_name', $data);

And in your view page just write

echo $message_name;