I wanted user to log again to the site whenever they close the browser. i searched everywhere and i found the easiest  way.     application/config/config.php     sess_expire_on_close = TRUE       Easy      Session Preferences  You'll find the following Session related preferences in your  file:      Preference   Default   Options   Description     sess_cookie_name   ci_session   None   The name you want the session cookie saved as.     sess_expiration   7200   None   The number of seconds you would like the session to  last. The default value is 2 hours (7200 seconds). If you would like a  non-expiring session set the value to zero: 0     sess_expire_on_close   FALSE   TRUE/FALSE (boolean)   Whether to cause the session to expire automatically when the browser window is closed.     sess_encrypt_cookie   FALSE   TRUE/FALSE (boolean)   Whether to encrypt the session data.     sess_use_database   FALSE   TRUE/FALSE (boolean)   Whether to save the session data to a database.  You must...
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