user_service.php

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user_service.php

payment_processor.php

data_validator.php

cache_manager.php

db_connection.php

auth_middleware.php

product_factory.php

event_handler.php

query_builder.php

api_response.php

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class UserService extends BaseService {↵

public function findById(int $id): ?User {↵

return $this->repository->find($id) ?? null;↵

}↵

}

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관련 연습 문제

payment_processor.php data_validator.php cache_manager.php db_connection.php auth_middleware.php product_factory.php