Petrovich::lastname

public function lastname($lastname, $case = Petrovich::CASE_NOMENATIVE) {
//		if(empty($lastname))
//			throw new Exception('Lastname cannot be empty.');

	if ($case === Petrovich::CASE_NOMENATIVE) {
		return $lastname;
	}

	return $this->inflect($lastname,$case,__FUNCTION__);
}