Sulu\Bundle\ContactBundle\Contact\AbstractContactManager::hasMain PHP Метод

    private function hasMain($arrayCollection, &$mainEntity = null)
    {
        if ($arrayCollection && !$arrayCollection->isEmpty()) {
            return $arrayCollection->exists(function ($index, $entity) {
                $mainEntity = $entity;
                return $entity->getMain() === true;
            });
        }
        return false;
    }