public function hasListeners(string $event): bool
    {
        return $this->has($event) && ! empty(self::$events[$event]);
    }
public function hasListeners(string $event): bool
    {
        return $this->has($event) && ! empty(self::$events[$event]);
    }
public function hasListeners ( string $ event ) : bool { return $ this -> has ( $ event ) && ! empty ( self :: $ events [ $ event ] ) ; }
Determine whether an event has listeners.

@param string $event The event

@return bool
Determine whether an event has listeners .