change status to 0 when user close browser - php

Question

I'am trying to build a simple system to indicate weather the user is online or not. but I have one issue
when the user close the tap or the browser, the ajax code can't refresh the page that handles user track activity.
my php code that change the value to 0 if the user was inactive for 2 minutes
if (isset($_SESSION['LAST_ACTIVITY']) && (time() - $_SESSION['LAST_ACTIVITY'] > 61)) {
$query = "UPDATE [ccc].[users] SET active = 0 WHERE ldap ='$ldap'";
sqlsrv_query($conn,$query);
}
jquery code to check every 5 seconds
$(document).ready(function () {
/*check existing users*/
function session_checking() {
$.post("../ajax-session.php", function (data) {
});
}
setInterval(session_checking, 5000);
});
How can I change the status to 0 if the user closed the browser ?

Answer 1

As far as I know, there is no way to notify the server when the user closes the tab/window.
Maybe you could create a task who constantly checks the activity of your users, inactivating them:
UPDATE users SET is_online = 0 WHERE is_online = 1 AND last_activity <= [WHAT YOU NEED]
Remember to create the proper indexes on your table, considering that you will run the above query frequently.

Answer 2

use setcookie for this
setcookie('newtest', 'newtest', 0);

Answer 3

Simply set a variable which has the session data at login process. So you may check whether user is active or not later. like:
$_SESSION["user"] = array(
"s_name" => "user1#email.com",
"login_time" => time()
);
if($_SESSION["user"]["login_time"] < time()+2*60){ unset($_SESSION["user"]); }
in application:
if(isset($_SESSION["user"])){ ... }