title: How to destroy session with browser closing in codeigniter
body: <p>Recently I have developed a web application with codeigniter. I am facing a session related problem there badly.</p>
  
  <p><strong>Problem scenario:</strong> </p>
  
  <p>If user A logged into the application then the user id set in session. After doing task user A closed his browser and leave the computer. A little while later user B came and open browser and see the application was in logged in state. or when user B write down the url and press enter it directly redirected into the application without any authentication by using the previous session.</p>
  
  <p>I used the following configuration for session:</p>
  
  <pre><code>$config['sess_cookie_name']     = 'ci_session';
  $config['sess_expiration']      = 1800;
  $config['sess_expire_on_close'] = FALSE;
  $config['sess_encrypt_cookie']  = FALSE;
  $config['sess_use_database']    = FALSE;
  $config['sess_table_name']      = 'ci_sessions';
  $config['sess_match_ip']        = FALSE;
  $config['sess_match_useragent'] = TRUE;
  $config['sess_time_to_update']  = 300;
  </code></pre>
  
  <p>Now my question is how can i destroy all the session with closing browser or browser tab in codeigniter? </p>