In what ways can PHP developers implement server-side checks to handle scenarios where users close tabs or lose connection in a live chat application?

When users close tabs or lose connection in a live chat application, PHP developers can implement server-side checks to handle these scenarios by using techniques like heartbeat checks or setting timeouts for inactive connections. By regularly checking the connection status and handling disconnect events gracefully, developers can ensure a smoother user experience.

// Check for user activity every 30 seconds
$timeout = 30;

// Handle disconnect events
function handleDisconnect() {
    // Code to handle user disconnect
}

// Check for user activity
while (true) {
    $last_activity = // Get last activity timestamp from database or session
    if (time() - $last_activity > $timeout) {
        handleDisconnect();
        break;
    }
    sleep(1);
}