PHPのリアルタイム通信機能とサーバープッシュ技術の比較分析

require 'vendor/autoload.php';

use RatchetMessageComponentInterface;
use RatchetConnectionInterface;

class Chat implements MessageComponentInterface {
    protected $clients;

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

    public function onOpen(ConnectionInterface $conn) {
        $this->clients->attach($conn);
    }

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

    public function onClose(ConnectionInterface $conn) {
        $this->clients->detach($conn);
    }

    public function onError(ConnectionInterface $conn, Exception $e) {
        $conn->close();
    }
}

$server = IoServer::factory(
    new HttpServer(
        new WsServer(
            new Chat()
        )
    ),
    8080
);

$server->run();

header('Content-Type: text/event-stream');
header('Cache-Control: no-cache');
header('Connection: keep-alive');

$lastEventId = isset($_SERVER["HTTP_LAST_EVENT_ID"]) ? $_SERVER["HTTP_LAST_EVENT_ID"] : null;
$counter = $lastEventId ? intval($lastEventId) : 0;

while (true) {
    $counter++;
    echo "id: $counter
";
    echo "data: This is event $counter

";
    flush();
    usleep(1000000); // 1秒延迟
}

const WebSocket = require('ws');

const wss = new WebSocket.Server({ port: 8080 });

wss.on('connection', function connection(ws) {
  ws.on('message', function incoming(message) {
    wss.clients.forEach(function each(client) {
      if (client !== ws && client.readyState === WebSocket.OPEN) {
        client.send(message);
      }
    });
  });
});

while (true) {
    $newData = getData();

    if ($newData !== null) {
        echo json_encode($newData);
        break;
    }

    usleep(1000000); // 延迟1秒
}