foreach($myArray = [
                    Deal::NAME_CONTACT => Contact::NAME,
                    Deal::LAST_NAME_CONTACT => Contact::LAST_NAME,
                    Deal::SECOND_NAME_CONTACT => Contact::SECOND_NAME
                ] as $dealFieldName => $contactFieldName) {
            if (array_key_exists($contactFieldName, $arFields))
                $updateDealFields[$dealFieldName] = $arFields[$contactFieldName];
        }