Codeigniter inherit a existing $_SESSION

Question

I am attempting to capture exiting sessions from a NONE codeigniter site, the site has a variable called $_SESSION['username'] , now when the current user is logged from that site and attempt to visit the codeigniter site the controller will just transfer the current $_SESSION to set_userdata, so far below is my code but i have no luck trying to print_r if its successfully captured, any help would be great!

I am using the $this->session->set_userdata.

    <?php

    class Pages extends CI_Controller{

        public function view($page = 'home'){



                if(!file_exists(APPPATH.'views/pages/'.$page.'.php')){
                        show_404();
                }

        $this->session->set_userdata('CI_Username',$_SESSION['username']);           
        $data['user'] = $this->session->userdata('CI_Username');


                $data['title'] = ucfirst($page);

                $this->load->view('templates/header');
                $this->load->view('templates/nav');
                $this->load->view('pages/'.$page, $data);
                $this->load->view('templates/footer');

                print_r($data);

        }

}

Answer 1

When set the sessions

$sessionoptions = array('username', 'John');

$this->session->set_userdata($sessionoptions);

https://www.codeigniter.com/user_guide/libraries/sessions.html#adding-session-data

Make sure on the config.php you have set the session save path correct.

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = APPPATH . 'cache/sessions/';
$config['sess_match_ip'] = TRUE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = TRUE;

Set session folder permission 0700.

Then

$data['user'] = $this->session->userdata('username');

Answer 2

If you want to get data of sessions, you should try this:

$data['user'] = $this->session->userdata('CI_Username');

Because

$this->session->set_userdata(...);

is used to assign value to your session.

Here is the link: Link