ddd structure in php

main.php
namespace App\Domain;

// Entities
class User {
    private $id;
    private $name;
    
    public function __construct(int $id, string $name) {
        $this->id = $id;
        $this->name = $name;
    }

    // Getters and setters
}

// Value Objects
class Email {
    private $email;

    public function __construct(string $email) {
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            throw new \InvalidArgumentException('Invalid email address');
        }
        $this->email = $email;
    }

    public function getEmail(): string {
        return $this->email;
    }
}

// Repositories
interface UserRepositoryInterface {
    public function findById(int $id): ?User;
    public function save(User $user): void;
}

class UserRepository implements UserRepositoryInterface {
    public function findById(int $id): ?User {
        // Code to fetch user from database by id
    }

    public function save(User $user): void {
        // Code to save user to the database
    }
}

// Services
class UserService {
    private $userRepository;

    public function __construct(UserRepositoryInterface $userRepository) {
        $this->userRepository = $userRepository;
    }

    public function getUserDetails(int $userId): ?array {
        $user = $this->userRepository->findById($userId);
        if ($user) {
            return ['id' => $user->getId(), 'name' => $user->getName()];
        }
        return null;
    }
}
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