PKPNotificationOperationManager::deleteTrivialNotifications PHP Method

    public function deleteTrivialNotifications($notifications)
    {
        $notificationDao = DAORegistry::getDAO('NotificationDAO');
        foreach ($notifications as $notification) {
            // Delete only trivial notifications.
            if ($notification->getLevel() == NOTIFICATION_LEVEL_TRIVIAL) {
                $notificationDao->deleteById($notification->getId(), $notification->getUserId());
            }
        }
    }