怎么用PHP和WebSocket获取实时数据 - 问答

要使用PHP和WebSocket获取实时数据，您需要先创建一个WebSocket服务器来接收和发送实时数据。

以下是一个简单的示例代码，您可以使用PHP和Ratchet库来创建WebSocket服务器：

首先，安装Ratchet库：

composer require cboden/ratchet

创建一个WebSocket服务器的PHP文件（server.php）：

<?php
require 'vendor/autoload.php';

use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;

class MyWebSocketServer implements MessageComponentInterface {
    protected $clients;

    public function __construct() {
        $this->clients = new \SplObjectStorage;
    }

    public function onOpen(ConnectionInterface $conn) {
        $this->clients->attach($conn);
        echo "New connection! ({$conn->resourceId})\n";
    }

    public function onMessage(ConnectionInterface $from, $msg) {
        foreach ($this->clients as $client) {
            if ($client !== $from) {
                $client->send($msg);
            }
        }
    }

    public function onClose(ConnectionInterface $conn) {
        $this->clients->detach($conn);
        echo "Connection {$conn->resourceId} has disconnected\n";
    }

    public function onError(ConnectionInterface $conn, \Exception $e) {
        echo "An error has occurred: {$e->getMessage()}\n";
        $conn->close();
    }
}

$server = new \Ratchet\Server\IoServer(
    new \Ratchet\Http\HttpServer(
        new \Ratchet\WebSocket\WsServer(
            new MyWebSocketServer()
        )
    ),
    8080
);

echo "WebSocket server started\n";

$server->run();

运行WebSocket服务器：

php server.php

创建一个简单的HTML文件来连接WebSocket服务器并接收实时数据（index.html）：

<!DOCTYPE html>
<html>
<head>
    <title>Real-time Data</title>
</head>
<body>
    <ul id="messages"></ul>
    
    <script>
        var conn = new WebSocket('ws://localhost:8080');

        conn.onmessage = function(e) {
            var messages = document.getElementById('messages');
            var message = document.createElement('li');
            message.innerHTML = e.data;
            messages.appendChild(message);
        };
    </script>
</body>
</html>

将index.html文件放在您的Web服务器上，并打开它以连接到WebSocket服务器并接收实时数据。您可以在WebSocket服务器的onMessage方法中发送实时数据并在客户端接收和显示。

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