How to check session expired when user is idle codeigniter - codeigniter

Question

i would like to check if the user is idle for more than 5 minutes, they will be redirected to login page. i have no idea the best practices to do this. gimme solution. i code with codeigniter.

Answer 1

This can be done with combination of jQuery/javascript/Ajax and a Codeigniter function.
JS
<script type="text/javascript">
var currentSessionValue = 1;
// pseudo code
setTimeout(checkSession, 5000);
function checkSession() {
$.ajax({
url: "CheckSession/check_session", //Change this URL as per your settings
success: function(newVal) {
if (newVal != currentSessionValue);
currentSessionValue = newVal;
alert('Session expired.');
window.location = 'Your redirect login URL goes here.';
}
});
}
</script>
Codeigniter
class CheckSession extends Controller{
public function __construct(){
session_start();
}
public function check_session(){
//Below last_visited should be updated everytime a page is accessed.
$lastVisitTime = $this->session->userdata("last_visited");
$fiveMinutesBefore = date("YmdHi", "-5 minutes");
echo date("YmdHi", strtotime($lastVisitTime)) > $fiveMinutesBefore > 1 : 0;
}
}

Answer 2

Simply store the last_visited timestamp as a session variable. Next time when the user visits, check for difference in current timestamp against the one in session. If it is more than 5 minutes, sign out user.
$this->load->library('session');
$this->session->set_userdata(array(
'last_visited' => time()
));

Answer 3

I check session expiry by simply try to read a variable I stored on login
I placed this in My_Controller in the folder application/core, and extend all my other controller based on this.
in the class, I have this function
function _is_logged_in()
{
return !empty($this->session->userdata('user_id'));
}
in my class, in the __construct i do this
if (!$this->_is_logged_in()) {
$this->_log_out("Session Expired", base_url("login"));
}
so when i make a request, if the session has expired, it redirects to login, no need to check every 5 minutes.