how to keep the session when browser closed in codeigniter3?

Currently i am using codeigniter3 which i am storing my session driver in database.
Session should not destroy on browser close.
When user clicks the logout button only then should the session get destroyed.
How to achieve it in codeigniter3?
Please give me any solutions.
This is my config file

Code:

$config['sess_driver'] = 'database';
$config['sess_use_database']    = TRUE;
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 0;
$config['sess_save_path'] = 'ci_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 0;
$config['sess_regenerate_destroy'] = FALSE;

In the previous version, Codeigniter had

Code:

sess_expire_on_close

in the config file but now they have removed it. https://codeigniter.com/user_guide/libra...sions.html