// Create a new event with a description $event = new Event("my_event", Event::READ, function() { // Event callback function }); $event->setDescription("This event is triggered when a user reads a file."); // Register the event with the event loop $event_base = new EventBase(); $event->setBase($event_base); $event->add();In this example, we create a new event object and set its type to READ. We then use the setDescription method to provide a description of the event, which will be displayed when the event is triggered. Finally, we add the event to an event loop using the add method. The package library for this code example is most likely the "Event" extension for PHP, which provides an object-oriented interface for creating and managing events in PHP applications.