Are there any specific PHP libraries or frameworks that are commonly used for implementing internal messaging systems?

When implementing an internal messaging system in PHP, commonly used libraries or frameworks include Laravel's built-in notification system, Symfony Messenger component, and PHPMailer for sending emails. These tools provide functionality for sending and receiving messages, managing notifications, and handling email delivery within the application.

// Example using Laravel's notification system to send an internal message
$user->notify(new InternalMessage($message));