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/ratchetuse 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();<!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>通过以上步骤，就可以在PHP中通过WebSocket实时更新数据了。在服务器端接收到数据时，会将数据发送给所有连接的客户端，客户端接收数据后可以实时更新页面。
