How can developers troubleshoot and debug session expiration issues in PHP applications?

Session expiration issues in PHP applications can be troubleshooted and debugged by checking the session configuration settings in the php.ini file, ensuring that the session expiration time is set correctly. Developers can also check for any code that might be destroying the session prematurely or not updating the session expiration time properly. Additionally, monitoring the session variables and debugging any errors related to session handling can help identify the root cause of the expiration issues.

// Check and update session expiration time
ini_set('session.gc_maxlifetime', 3600); // Set session expiration time to 1 hour

// Start the session
session_start();

// Check if session is active
if (isset($_SESSION['last_activity']) && (time() - $_SESSION['last_activity'] > 3600)) {
    // Destroy session if inactive for more than 1 hour
    session_unset();
    session_destroy();
}

// Update last activity time
$_SESSION['last_activity'] = time();