code: private function sortSubscribers($eventName)
      {
          \krsort($this->subscribers[$eventName]);
          $this->sorted[$eventName] = array();
          foreach ($this->subscribers[$eventName] as $priority => $subscribers) {
              foreach ($subscribers as $k => $subscriber) {
                  if ($this->isClosureFactory($subscriber)) {
                      $subscriber[0] = $subscriber[0]();
                      $this->subscribers[$eventName][$priority][$k] = $subscriber;
                  }
                  $this->sorted[$eventName][] = $subscriber;
              }
          }
      }
docs: Sorts the internal list of subscribers for the given event by priority.
  
  @param string $eventName The name of the event
  
  @return void