通过例子来了解 reaphp/socke-----02-chat-server.php

 array(
        'local_cert' => isset($argv[2]) ? $argv[2] : (__DIR__ . '/localhost.pem')
    )
));

$server = new LimitingServer($server, null);

$server->on('connection', function (ConnectionInterface $client) use ($server) {
    // whenever a new message comes in
    $client->on('data', function ($data) use ($client, $server) {
        // remove any non-word characters (just for the demo)
        $data = trim(preg_replace('/[^\w\d \.\,\-\!\?]/u', '', $data));

        // ignore empty messages
        if ($data === '') {
            return;
        }

        // prefix with client IP and broadcast to all connected clients
        $data = trim(parse_url($client->getRemoteAddress(), PHP_URL_HOST), '[]') . ': ' . $data . PHP_EOL;
        foreach ($server->getConnections() as $connection) {
            $connection->write($data);
        }
    });
});

$server->on('error', 'printf');

echo 'Listening on ' . $server->getAddress() . PHP_EOL;

$loop->run();