PHP怎么通过WebSocket实时更新数据

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要通过 WebSocket 实时更新数据，首先需要在 PHP 中创建一个 WebSocket 服务器。可以使用第三方库如 Ratchet 或 ReactPHP 来实现 WebSocket 服务器。下面以 Ratchet 为例，介绍如何在 PHP 中通过 WebSocket 实时更新数据：

安装 Ratchet 库
首先需要安装 Ratchet 库，可以通过 Composer 进行安装：

composer require cboden/ratchet

创建 WebSocket 服务器
在 PHP 中创建一个 WebSocket 服务器，监听指定的端口，并处理客户端的连接和消息。

use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;

require 'vendor/autoload.php';

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, $msg) {// 处理客户端发送的消息 
        foreach ($this->clients as $client) {$client->send($msg); // 发送消息给所有客户端 
        }
    }

    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\WebSocket\WsServer(new MyWebSocketServer);
$server = new Ratchet\Http\HttpServer($server);
$loop = React\EventLoop\Factory::create();
$socket = new React\Socket\Server('0.0.0.0:8080', $loop);
$server = new Ratchet\Server\IoServer($server, $socket, $loop);
$server->run();

在客户端与服务器建立 WebSocket 连接
在前端页面中使用 WebSocket 建立与服务器的连接，并发送和接收数据。

<!DOCTYPE html>
<html>
<head>
    <title>WebSocket Test</title>
</head>
<body>
    <input type="text" id="input" placeholder="Enter message">
    <button onclick="sendMessage()">Send</button>
    <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.appendChild(document.createTextNode(e.data));
            messages.appendChild(message);
        };

        function sendMessage() {var input = document.getElementById('input');
            conn.send(input.value);
            input.value = '';
        }
    </script>
</body>
</html>