src/event/EventManager.php
private function orderObserversForPriority($a, $b) {
        if($a->order > $b->order) {
            return +1;
        } elseif ($a->order == $b->order) {
            return 0;
        }
        return -1;
    }
private function orderObserversForPriority($a, $b) {
        if($a->order > $b->order) {
            return +1;
        } elseif ($a->order == $b->order) {
            return 0;
        }
        return -1;
    }
Order The observers using the order integer value. Lower number is going
to execute first, in case of have the same order it goes first the first
observer assign to the event.

@param stdClass $a
@param stdClass $b
@return int