websocket Php

以下是一个使用PHP实现WebSocket实时消息推送的示例：

<?php
class SocketService {
    private $address = '0.0.0.0';
    private $port = 8080;
    private $socket;

    public function __construct() {
        $this->createSocket();
        $this->bindSocket();
        $this->listenForConnections();
    }

    private function createSocket() {
        $this->socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
        if ($this->socket === false) {
            echo "Failed to create socket: " . socket_strerror(socket_last_error()) . "\n";
            exit(1);
        }
    }

    private function bindSocket() {
        if (!socket_bind($this->socket, $this->address, $this->port)) {
            echo "Failed to bind socket: " . socket_strerror(socket_last_error($this->socket)) . "\n";
            exit(1);
        }
    }

    private function listenForConnections() {
        if (!socket_listen($this->socket)) {
            echo "Failed to listen for connections: " . socket_strerror(socket_last_error($this->socket)) . "\n";
            exit(1);
        }

        echo "Server started. Listening for connections...\n";

        while (true) {
            $clientSocket = socket_accept($this->socket);
            if ($clientSocket === false) {
                echo "Failed to accept connection: " . socket_strerror(socket_last_error($this->socket)) . "\n";
                continue;
            }

            $this->handleClient($clientSocket);
        }
    }

    private function handleClient($clientSocket) {
        $request = socket_read($clientSocket, 1024);
        $response = "HTTP/1.1 101 Switching Protocols\r\n" .
            "Upgrade: websocket\r\n" .
            "Connection: Upgrade\r\n" .
            "Sec-WebSocket-Accept: " . $this->generateAcceptKey($request) . "\r\n\r\n";

        socket_write($clientSocket, $response, strlen($response));
        socket_close($clientSocket);
    }

    private function generateAcceptKey($request) {
        $key = '';
        if (preg_match("/Sec-WebSocket-Key: (.*)\r\n/", $request, $matches)) {
            $key = $matches[1];
        }
        return base64_encode(sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true));
    }
}

$socketService = new SocketService();

这个示例创建了一个WebSocket服务器，监听在本地的8080端口。当有客户端连接时，服务器会发送一个升级协议的响应，告诉客户端即将升级为WebSocket协议。这个示例只是一个简单的演示，实际应用中可能需要添加更多的功能和处理逻辑。