Lithe Events

Lithe Events is a lightweight event handling library designed for PHP applications. It provides a straightforward way to create and manage events, supporting a decoupled architecture that enhances the maintainability and flexibility of your applications.

Table of Contents

• Installation
• Usage
  • Using the EventDispatcher Class
    • Creating an Event
    • Registering Listeners
    • Emitting Events
    • Removing Listeners
  • Using Orbis Event Functions
• Example
• License

Installation

To install lithemod/events, use Composer. Run the following command in your project directory:

composer require lithemod/events

This command will download the package and update your composer.json file accordingly.

Usage

Using the EventDispatcher Class

The EventDispatcher class serves as the core for managing events and listeners. Here's how to use it effectively:

Creating an Event

To create an event, instantiate the Event class:

use Lithe\Events\Event;

$event = new Event('event.name', ['key' => 'value']);

• Parameters:
  • event.name: A string that identifies the event.
  • ['key' => 'value']: An optional associative array to store additional event data.

Registering Listeners

You can create an instance of EventDispatcher and register a listener for an event using the on method. A listener is a callable executed when the event is emitted.

use Lithe\Events\EventDispatcher;

$dispatcher = new EventDispatcher();

$listener = function ($data) {
    echo "Event data: " . json_encode($data);
};

// Register the listener
$dispatcher->on('event.name', $listener);

Emitting Events

To emit an event and trigger all registered listeners, use the emit method:

$event = new Event('event.name', ['key' => 'value']);
$dispatcher->emit($event);

Removing Listeners

If you need to remove a listener from an event, use the off method:

$dispatcher->off('event.name', $listener);

Using Orbis Event Functions

In addition to using the EventDispatcher, you can utilize helper functions provided by the Orbis namespace for convenient event management.

Registering Listeners

To register a listener for an event using Orbis, use the on function:

use Lithe\Orbis\Events;

$listener = function ($data) {
    echo "Event data: " . json_encode($data);
};

// Register the listener
Events\on('event.name', $listener);

Emitting Events

To emit an event using Orbis, call the emit function:

use Lithe\Orbis\Events;
use Lithe\Events\Event;

$event = new Event('event.name', ['key' => 'value']);
Events\emit($event);

Removing Listeners

To remove a registered listener with Orbis, use the off function:

Events\off('event.name', $listener);

Example

Here's a complete example of how to use lithemod/events with the Orbis event functions:

use Lithe\Events\Event;
use Lithe\Orbis\Events;

// Create a listener
$listener = function ($data) {
    echo "Event received with data: " . json_encode($data) . "\n";
};

// Register the listener
Events\on('my.event', $listener);

// Emit the event
$data = ['msg' => 'Hello, world!'];
Events\emit(new Event('my.event', $data));

// Remove the listener
Events\off('my.event', $listener);

License

This project is licensed under the MIT License.