在Codeigniter中检索会话数据

Question

I am creating an application which requires a login. The user is able to login, and the application will identify if the user has entered the correct credentials. From here the user will be presented with a dashboard containing information specific to them.

Once a user has entered the correct details, the following code executes:

$this->load->library('session');
$this->session->set_userdata('logged_in', true);
redirect('dashboard', 'refresh');

The application will direct the user to the correct location, which contains the following code:

$this->load->library('session');
print_r($this->session->all_userdata());

This will display the standard session information (session_id, ip_address etc.), but the data in which I stored is not shown.

How do I go about fixing this so that this session data is accessible on every page?

Any help would be greatly appreciated.

Edit:

Here are the current settings for sessions/cookies in config.php:

$config['sess_cookie_name']     = 'ci_session';
$config['sess_expiration']      = 7200;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie']  = TRUE;
$config['sess_use_database']    = TRUE;
$config['sess_table_name']      = 'ci_sessions';
$config['sess_match_ip']        = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update']  = 300;
$config['cookie_prefix']    = "";
$config['cookie_domain']    = "";
$config['cookie_path']      = "/";
$config['cookie_secure']    = FALSE;

Answer 1

When you log in to the controller, and if you are using CodeIgniter 2, you need to set sessions on the database:

$config['sess_cookie_name']     = 'ci_session';
$config['sess_expiration']      = 7200;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie']  = TRUE;
$config['sess_use_database']    = TRUE;
$config['sess_table_name']      = 'ci_sessions';
$config['sess_match_ip']        = TRUE; // Change FALSE TO TRUE
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update']  = 300;

config/autoload.php

$autoload['libraries'] = array(
    'database',
    'session'
);

In config/config.php, enter your own encryption_key

$config['encryption_key'] = 'FN3ig7JhmCeE9mWFc1BOetIt603qcr81';

Login

public function index() {
    $this->load->library('form_validation');
    $this->form_validation->set_rules('username', 'Username', 'required');
    $this->form_validation->set_rules('password', 'Password', 'required');

    if ($this->form_validation->run() == FALSE) {
        $this->load->view('common/login_view');
    }
    else {
        $set_userdata = array(
            'is_logged' => true,
            'username' => $this->input->post('username')
        );
        $this->session->set_userdata($set_userdata);
        redirect('success_page');
    }
}

On your parent part of controller.

<?php
    class dashboard extends CI_Controller {
        public function __construct() {
            parent::__construct();
            if ($this->session->userdata('is_logged') == FALSE) {
                redirect('your error page or login');
            }
        }

        public function index() {

        }
    }

View Dashboard

<pre>
    <?php print_r($this->session->all_userdata()); ?>
</pre>

Single
<?php echo $this->session->userdata('username'); ?>

I would recommend using CodeIgniter 3 now, http://www.codeigniter.com/.

The other option is you could create a core/MY_Controller.php file:

class MY_Controller extends CI_Controller {

    public function __construct() {

        parent::__construct();
        if ($this->session->userdata('is_logged') == FALSE) {
            redirect('your error page or login');
        }
    }
}

And then extend the controller you need sessions enabled:

<?php
    class dashboard extends MY_Controller {
        public function __construct() {
            parent::__construct();
        }

        public function index() {

        }
    }