Sending Message to a Specific Client Without Looping Through Array
I'd to send a  message to a specific client in Ratchet. Currently, I use:

`foreach ($this->clients as $client) {
   if ($tosendid == $client->resourceId) {
                $client->send($msg);
   }
}`

I wonder if there's a direct way to send a message to the client without looping through the whole array. I don't mind, but I wonder if this method is slow because when you've 10,000 concurrent users, it might be slow to loop through an array just to send message to one user.