Rewritten CodeIngiter's session library that implements native PHP session functionality.
First of all you have to copy this session library file to your application library folder, for example, .application/libraries/Session.php. This will override the CodeIgniter's standart session class.
This session class uses configuration values from main config file .application/config/config.php. Below are listed config options required for this class:
$config['sess_expiration'] = 7200;
$config['sess_expire_on_close'] = TRUE;
$config['sess_match_ip'] = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update'] = 300;
Also, you can set the httponly option for session cookie, which wasn't available in standart CI session library:
$config['sess_cookie_httponly'] = TRUE;
Usage of this library is exactly the same as of CI standart library, so check out the user guide:
http://ellislab.com/codeigniter/user-guide/libraries/sessions.html