title: How can I send data to multiple channels at once? (laravel, broadcasting)
body: <p>I have one event for broadcasting, there is channel for subscription on client side:</p>
  
  <pre><code>/**
  * Get the channels the event should broadcast on.
  *
  * @return PrivateChannel
  */
  public function broadcastOn()
  {
      return new PrivateChannel("user.{$this-&gt;userId}");
  }
  </code></pre>
  
  <p>How can I send data to multiple channels at once (on user.1, user.2, user.3 ...)?</p>
  
  <p><strong>Refinement, to specific users, not to everyone who has subscribed to the room.</strong></p>