Hoa is a modular, extensible and structured set of PHP libraries. Moreover, Hoa aims at being a bridge between industrial and research worlds.
This library allows to manipulate the WebSocket protocol and proposes a server and a client. It supports two specifications RFC6455 and Hybi (at the same time).
With Composer, to include this library into your
dependencies, you need to require
hoa/websocket:
{
"require": {
"hoa/websocket": "~3.0"
}
}Please, read the website to get more informations about how to install.
As a quick overview, we propose to start a websocket server and echo messages.
The class Hoa\Websocket\Server proposes six listeners: open, message,
binary-message, ping, close and error. Thus:
$websocket = new Hoa\Websocket\Server(
new Hoa\Socket\Server('ws://127.0.0.1:8889')
);
$websocket->on('open', function (Hoa\Event\Bucket $bucket) {
echo 'new connection', "\n";
return;
});
$websocket->on('message', function (Hoa\Event\Bucket $bucket) {
$data = $bucket->getData();
echo '> message ', $data['message'], "\n";
$bucket->getSource()->send($data['message']);
echo '< echo', "\n";
return;
});
$websocket->on('close', function (Hoa\Event\Bucket $bucket) {
echo 'connection closed', "\n";
return;
});
$websocket->run();Finally, we have to write a client in HTML and Javascript:
<input type="text" id="input" placeholder="Message…" />
<hr />
<pre id="output"></pre>
<script>
var host = 'ws://127.0.0.1:8889';
var socket = null;
var input = document.getElementById('input');
var output = document.getElementById('output');
var print = function (message) {
var samp = document.createElement('samp');
samp.innerHTML = message + '\n';
output.appendChild(samp);
return;
};
input.addEventListener('keyup', function (evt) {
if (13 === evt.keyCode) {
var msg = input.value;
if (!msg) {
return;
}
try {
socket.send(msg);
input.value = '';
input.focus();
} catch (e) {
console.log(e);
}
return;
}
});
try {
socket = new WebSocket(host);
socket.onopen = function () {
print('connection is opened');
input.focus();
return;
};
socket.onmessage = function (msg) {
print(msg.data);
return;
};
socket.onclose = function () {
print('connection is closed');
return;
};
} catch (e) {
console.log(e);
}
</script>Here we are. All sent messages are echoed.
The following awecodes show this library in action:
Hoa\Websocket: why and how to useHoa\Websocket\ServerandHoa\Websocket\Client? A simple example will illustrate the WebSocket protocol.
Different documentations can be found on the website: http://hoa-project.net/.
Hoa is under the New BSD License (BSD-3-Clause). Please, see
LICENSE.
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