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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。
