session not closed after close the browser.

session not closed after close the browser. when i reopen the url,the session is active. i am string the sessions.

In config file
***********
config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_sessions';

$config['sess_expiration'] = 7200;

$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = TRUE;

$config['sess_expire_on_close'] = TRUE;
$config['sess_encrypt_cookie'] = FALSE;

Did you close all the browser windows, or just one tab?

Cookies are kept unless you close all the windows:
https://stackoverflow.com/a/805900

Also you may need to close and destroy the session.

PHP Code:

$this->session->unset_userdata('some_name');

// or

$array_items = array('username', 'email');

$this->session->unset_userdata($array_items);

$this->session->sess_destroy(); 


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