Domain-model: User

Email.php

<?php

class Email
{
    
    private $email;
    
    public function __construct($email)
    {
        if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
            throw new \InvalidArgumentException('Invalid Email');
        }
        
        $this->email = $email;
    }
    
    public function __toString()
    {
        return $this->email;
    }
}

User.php

<?php

class User
{
    
    private $id;
    
    private $email;
    
    private $password;
    
    /** todo: password should be Value Object too? */
    public function __construct(Email $email, $password)
    {
        $this->email = $email;
        $this->setPassword($password);
    }
    
    public function setPassword($password)
    {
        if (6 < strlen($password)) {
            throw new \InvalidArgumentException('Password is too short');
        }
        
        // and some other specific buisness rules
    
        // todo: User should'n know how to encode password...
        $this->password = password_hash($password, PASSWORD_BCRYPT);
    }
    
}

UserController.php

<?php

class UserController extends Controller {
    
    public function registerUser(Request $request)
    {
        $user = new User(
            new Email($request->get('email')),
            $request->get('password')
        );
        
        $this->get('app.repository.user')->add($user);
        
        return $user;
    }
    
}