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Socket.io messages from PHP
What does it do?
This package allows you to transfer socket message to a Node.js process via Redis. Socket.io has a redis adapter to allow scaling a Node.js cluster to send socket messages to any client connected to any process. We can use this to send messages straight from PHP.
This package provides a Socketio\Socketio class with similar methods as the socket.io server in Node.js such as
emit, in, to, of and adapter.
Usage
First we can create a Socketio\Socketio object.
$io = new Socketio\Socketio;
It has some of the same methods as in Node.js:
Namespace
$chats = $io->of('/chats');
$io->emit('general', $message);
$chats->emit('user.connected', $user);
Setup a server object with a different namespace. The $io object keeps the same namespace.
Or use a callback:
$io->of('/chats', function ($chats) {
$chats->emit('user.connected', $user);
});
$io->emit('general', $message);
Rooms
Send to specific room(s):
$io->to('room-a')->emit('event', $message);
$io->to('room-a')->to('room-b')->emit('event', $message);
$io->in('room-c')->emit('event', $message);
Where in is an alias of to. You can send to several rooms at the same time by chaining to calls.
The rooms are reset after every emit call. This is similar behaviour as in Node.js.
Adapters
By default, the Socketio\Socketio object configures a Memory adapter.
This adapter fakes socket message delivery and can be useful for testing/stubbing.
To setup the Redis adapter you need to configure some dependencies first.
$predis = new Predis\Client;
$msgpack = new Socketio\Utils\Msgpack;
$adapter = new Socketio\Adapters\Redis($predis, $msgpack);
$io->adapter($adapter);
If you have ext-msgpack installed, the Socketio\Utils\Msgpack will use the native
msgpack_pack and msgpack_unpack methods which are supposed to be the fastest around.
If not, you can pass it Msgpack\Encoder and Msgpack\Decoder objects to do the encoding/decoding.
These come pre-installed with composer if you require this package.
$msgpack = new Socketio\Utils\Msgpack(new Msgpack\Encoder, new Msgpack\Decoder);
The Node.js process
var app = require('express')();
var socketio = require('socket.io');
var adapter = require('socket.io-redis');
var server = app.listen(process.env.NODE_PORT || 9000);
io = socketio(server);
io.adapter(adapter());
Right now, you're good to go!
Contributing
Stick to PSR-2 Coding Standards and be nice in communication.