Server-Sent Events in PHP

A server implementation of server-sent events, written in PHP. It can be used to stream events back to the client. All event-driven features are highly customizable, even custom emitters can be used. The library also provides a PSR-7 compliant event stream implementation.

🚀 Features

• Server implementation of server-sent events (SSE)
• Highly customizable via interface implementations
• Self-emitting event stream
• PSR-7 compliant event stream

🔥 Installation

composer require eliashaeussler/sse

⚡ Usage

use EliasHaeussler\SSE;

// Open event stream
$eventStream = SSE\Stream\SelfEmittingEventStream::create();
$eventStream->open();

// Send event
$eventStream->sendEvent(new MyCustomEvent($eventData));

// Send message
$eventStream->sendMessage('myCustomEvent', $eventData);

// Close event stream
$eventStream->close();

🎢 Architecture

Event stream

All events are sent through event streams. The library provides an interface Stream\EventStream that abstracts all stream parts during the whole event streaming progress.

The following event stream implementations are currently available:

• Stream\SelfEmittingEventStream sends all stream data to an emitter that takes care of writing data into an active resource. This is the best working solution in most cases.
• Stream\Psr7EventStream creates a PSR-7 compliant response during the whole event streaming progress. Note that this response is not emitted on real time.

Emitter

All data of a self-emitting event stream is handed over to a given emitter. The library provides an interface Stream\Emitter\Emitter that takes care of all passed data.

The following emitter implementations are currently available:

• Stream\Emitter\RealtimeEmitter writes all stream data directly to the active standard output.

Event

There are two ways how data can be sent through an active event stream:

1. By sending a prebuilt event by calling Stream\EventStream::sendEvent().
2. By sending a plain message by calling Stream\EventStream::sendMessage().

Events can be generated by implementing the Event\Event interface. Each event must provide an event name and JSON-serializable event data.

🧑‍💻 Contributing

Please have a look at CONTRIBUTING.md.

⭐ License

This project is licensed under GNU General Public License 3.0 (or later).