CodeIgniter, set_flashdata not working after redirect - codeigniter

Question

set_flashdata is not working directly after redirect with only one redirect.
I am using one controller in this process - Profilers' Controller. It handles the member confirmation process and also displays the login page on the redirect. The process is as follows:
this session set_flashdata ('topic', 'newmember')
redirect ('login')
route ['login'] = 'profilers/signIn'
topic = $this session flashdata ('topic')
I have turned off all database session configuration for cleaner debugging and even though session library is turned on in configs, I have started calling it anyways which doesn't seem to work either.
Here is my code. As you can see, I am sending path info to a log file path.log:
in controller Profilers, function confirmMember:
public function confirmMember()
{
//use_ssl();
$this->form_validation->set_rules('handle', 'Unique Member Name', 'trim|xss_clean|required|min_length[5]|max_length[30]');
$this->form_validation->set_rules('confirmation', 'Confirmation Code', 'trim|xss_clean|required|min_length[20]|max_length[20]|alpha_numeric');
if ($this->form_validation->run() === FALSE) {echo "here";exit;
$data['handle']=$this->input->post('handle');
$data['confirmation']=$this->input->post('confirmation');
$this->load->view('signing/defaults/header',$data);
$this->load->view('defaults/heading',$data);
$this->load->view('defaults/banner');
$this->load->view('defaults/banner_right');
$this->load->view('member/temp/index',$data);
$this->load->view('defaults/footer',$data);
} else {
$post = $this->input->post(NULL,TRUE);
$data['member'] = $this->Signing_model->model_confirmMember($post);
if ($data['member']['confirmed']!==FALSE) {
/* PATH CHECK */
error_log("member confirmation not false\n",3, LOG_DIR.'path.log');
unset($post);
$this->session->sess_destroy();
$this->session->set_flashdata('topic', 'newmember');
// $this->session->keep_flashdata('topic');
redirect('login','refresh');
} else {
/* PATH CHECK */
error_log("member confirmation IS FALSE\n",3, LOG_DIR.'path.log');
$this->load->view('member/temp/index',$data);
}
My log file shows that the path is using the correct path and showing "member confirmation not false".
I have tried with keep_flash data on (which I assumed wouldn't work since there are no other redirects) and off.
I have also tried redirect without 'refresh'.
In config/routes.php:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
$route['join'] = 'profilers/joinUp';
$route['login'] = 'profilers/signIn';
...
Login page uses Profilers Controller, signIn function as show above:
public function signIn()
{
$topic = $this->session->flashdata('topic');
if (isset($topic)) {
$message = "topic is set. topic = ".$topic."\n";
if ($topic!==FALSE) {
error_log("flash var topic is not false\n", 3, LOG_DIR.'path.log');
} else {
error_log("flash var topic is FALSE\n", 3, LOG_DIR.'path.log');
}
} else {
$message = "topic is NOT set\n";
}
error_log($message,3,LOG_DIR.'path.log');
exit;
...
...
}
log file is showing that topic is set but is false.
"flash var topic is FALSE"
"topic is set. topic = "
Of course topic var not set since it is FALSE.
As you can see, I have moved the get flash data function to the beginning of my controller function to bypass anything that may be corrupting data.

Answer 1

You may need to start the session again after you have destroyed it.
Try adding this after your call to sess_destory():
$this->session->sess_create()
Alternatively you could avoid destroying the session, and unset() the values you wish to get rid of.