我用workerman/workerman来做websocket。主要的问题是-如何在websocket关闭时发送消息？我也试着向其他连接发送消息。也没有结果。

public function run()
    {
        $this->ws = new Worker(
            'websocket://0.0.0.0:' . $_ENV['WS_PORT'],
            ['ssl' => [
                'local_cert'  => $_ENV['WS_CERTIFICATE_CRT'],
                'local_pk'    => $_ENV['WS_CERTIFICATE_KEY'],
                'verify_peer' => false,
            ]]
        );
        $this->ws->count = 1;
        $this->ws->transport = 'ssl';

        $this->ws->onConnect = function ($connection) {
            $this->onConnect($connection);
        };

        $this->ws->onMessage = function ($connection, $data) {
            $this->onMessage($connection, $data);
        };

        $this->ws->onClose = function ($connection) {
            $this->onClose($connection);
        };

        Worker::runAll();
    }

这不管用

private function onClose($connection)
{
    $connection->send("Hello");
}