在 PHP 中可以使用 Ratchet 库来进行 WebSocket 编程。Ratchet 是一个用于 PHP 5.3+ 的基于标准的 WebSocket 库,可以与任何 Web 服务器配合使用。
以下是使用 Ratchet 进行 WebSocket 编程的步骤:
- 安装 Ratchet
可以使用 Composer 进行安装:
composer require cboden/ratchet
- 创建 WebSocket Server
use RatchetMessageComponentInterface;
use RatchetConnectionInterface;
require "vendor/autoload.php";
class WebSocketServer implements MessageComponentInterface {
private $clients;
public function __construct() {
$this->clients = new SplObjectStorage;
}
public function onOpen(ConnectionInterface $conn) {
$this->clients->attach($conn);
echo "New connection! ({$conn->resourceId})
";
}
public function onMessage(ConnectionInterface $from, $msg) {
foreach ($this->clients as $client) {
if ($from !== $client) {
$client->send($msg);
}
}
}
public function onClose(ConnectionInterface $conn) {
$this->clients->detach($conn);
echo "Connection {$conn->resourceId} has disconnected
";
}
public function onError(ConnectionInterface $conn, Exception $e) {
echo "An error has occurred: {$e->getMessage()}
";
$conn->close();
}
}
$server = new RatchetApp("localhost", 8080, "0.0.0.0");
$server->route("/websocket", new WebSocketServer);
$server->run();
- 运行 WebSocket Server
可以在命令行中运行以下命令来启动 WebSocket Server:
php websocket_server.php
- 使用客户端连接 WebSocket Server
可以使用 JavaScript WebSocket API 来连接 WebSocket Server,并发送和接收消息。
var socket = new WebSocket("ws://localhost:8080/websocket");
socket.onopen = function() {
console.log("Connected!");
socket.send("Hello, server!");
};
socket.onmessage = function(e) {
console.log("Message received: " + e.data);
};
socket.onclose = function() {
console.log("Disconnected!");
};
以上就是使用 Ratchet 进行 WebSocket 编程的基本步骤。