What are the best practices for error handling and debugging in PHP when working with sessionid values?

When working with sessionid values in PHP, it is important to handle errors and debug effectively to ensure the security and functionality of your application. One best practice is to always check if the sessionid value is valid before using it in any sensitive operations. Additionally, make sure to log any errors or exceptions related to session handling to aid in debugging.

// Check if sessionid value is valid before using it
if (isset($_SESSION['sessionid'])) {
    // Use the sessionid value in your code
} else {
    // Handle the case where sessionid is not set or invalid
}

// Log any errors or exceptions related to session handling
try {
    // Your session handling code here
} catch (Exception $e) {
    error_log('Session handling error: ' . $e->getMessage());
}