function trackUserLogin() { // Track user login event $event = new \Event('user.login'); $event->addProperty('username', $_POST['username']); $event->addProperty('ip_address', $_SERVER['REMOTE_ADDR']); $event->trigger(); } // Call the function when the user logs in if ($_POST['action'] == 'login') { trackUserLogin(); }This code creates a new Event object with the name "user.login" and adds two properties to it: the username of the user who logged in and their IP address. The trigger() method then sends the event to any listeners that are set up to listen for this type of event. To use the Event update feature in PHP, programmers may use a package library such as the Symfony EventDispatcher component or the Laravel Event system.