Demonstrates the use of Method Injection technique to capture key bussiness logic in the entity itself.

rich_domain_model.php

<?php

declare(strict_types=1);

final class AnonymizeData
{
    private $payload;

    public function __construct(array $payload)
    {
        $this->payload = $payload;
    }

    public function userId(): UserId
    {
        return UserId::fromString($this->payload['user_id']);
    }
}

final class AnonymizeDataHandler
{
    private $userRepository;
    
    private $faker;
    
    public function __construct(UserRepository $userRepository, Faker $faker)
    {
        $this->userRepository = $userRepository;
        $this->faker = $faker;
    }
    
    public function handle(AnonymizeData $command): void
    {
        $user = $this->userRepository->get($command->userId());
        $user->anonymizeData($this->faker);
        $this->userRepository->save($user);
    }
}

interface Faker
{
    public function email(): EmailAddress;
    
    public function randomDate(): DateTimeImmutable;
}

interface UserRepository
{
    public function get(UserId $id): User;
    
    public function save(User $user): void;
}

final class User
{
    private $id;
    
    private $emailAddress;
    
    private $registeredAt;
    
    public static function register(EmailAddress $emailAddress): User
    {
        $user = new self();
        $user->id = UserId::new();
        $user->emailAddress = $emailAddress;
        $user->registeredAt = new DateTimeImmutable();
        
        return $user;
    }
    
    public function id(): UserId
    {
        return $this->id;
    }
    
    public function emailAddress(): EmailAddress
    {
        return $this->emailAddress;
    }
    
    public function registeredAt(): DateTimeImmutable
    {
        return $this->registeredAt;
    }
    
    public function anonymizeData(Faker $faker): void
    {
        $this->emailAddress = $faker->email();
        $this->registeredAt = $faker->randomDate();
    }
}