WebSocket服务器

程序代码

ws_server.php

//创建websocket服务器对象，监听0.0.0.0:9502端口
$ws = new Swoole\WebSocket\Server("0.0.0.0", 9502);

//监听WebSocket连接打开事件
$ws->on('open', function ($ws, $request) {
    var_dump($request->fd, $request->get, $request->server);
    $ws->push($request->fd, "hello, welcome\n");
});

//监听WebSocket消息事件
$ws->on('message', function ($ws, $frame) {
    echo "Message: {$frame->data}\n";
    $ws->push($frame->fd, "server: {$frame->data}");
});

//监听WebSocket连接关闭事件
$ws->on('close', function ($ws, $fd) {
    echo "client-{$fd} is closed\n";
});

$ws->start();

• 客户端向服务器端发送信息时，服务器端触发onMessage事件回调
• 服务器端可以调用$server->push()向某个客户端（使用$fd标识符）发送消息

运行程序

php ws_server.php

可以使用Chrome浏览器进行测试，JS代码为：

var wsServer = 'ws://127.0.0.1:9502';
var websocket = new WebSocket(wsServer);
websocket.onopen = function (evt) {
    console.log("Connected to WebSocket server.");
};

websocket.onclose = function (evt) {
    console.log("Disconnected");
};

websocket.onmessage = function (evt) {
    console.log('Retrieved data from server: ' + evt.data);
};

websocket.onerror = function (evt, e) {
    console.log('Error occured: ' + evt.data);
};

Comet

WebSocket服务器除了提供WebSocket功能之外，实际上也可以处理Http长连接。只需要增加onRequest事件监听即可实现Comet方案Http长轮询。

!> 详细使用方法参考Swoole\Websocket