CodeIgniter Session - i am not getting my userdata in other controller - codeigniter

Question

here is my code to set session
$login_data = array('logged_in'=>TRUE, 'user_id'=>$userid);
$this->session->set_userdata($login_data);
redirect('dashboard');
above code creates a new entry in ci_session table in my db and it has logged_in value
In dashboard controller i am checking session. Below is my code in dashboard controller
function __construct(){
parent::__construct();
$logged_in = $this->session->userdata('logged_in');
if(!$logged_in){
redirect("welcome");
}
}
In above constructor block i am not getting the value of logged_in.
I have also tried to print all my userdata using var_dump($this->session->all_userdata) but all I get is an empty string.
Please tell me what could be the reason behing it. I also searched for cookie but i didn't find that in my computer. below is my config detail
$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;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update'] = 300;

Answer 1

I have solved my problem. I just forgot to change my Cookie Related Variables in config. –

Answer 2

My first guess is being you're doing this in the __construct method which is executed when the class is initialized - before the page is even loaded and your sessions data is set.
$logged_in = $this->session->userdata('logged_in');
if(!$logged_in){
redirect("welcome");
}
Will work if you add in into the beginning of the page method.

Answer 3

Is the library being autoloaded? Check config/autoload.php:
$autoload['libraries'] = array('database', 'session', 'form_validation');
Or call $this->load->library('session'); right before using the class.