DTO example

Category.php

final class Category
{
  private string $name;

  public static function fromName(string $name): self
  {
    return new self($name);
  }

  private function __construct(string $name)
  {
    $this->name = $name;
  }

  public function getName(): string
  {
    return $this->name;
  }

  public function rename(string $name): void
  {
    $this->name = $name;
  }
}

EditCategoryProxy.php

final class EditCategoryProxy
{
  private $category;

  public static function fromCategory(Category $category): self
  {
    return new self($category);
  }

  private function __construct(Category $category)
  {
    $this->category = $category;
  }

  public function getName(): ?string
  {
    return $this->category->getName();
  }

  public function setName(string $name): void
  {
    $this->category->rename($name);
  }
}

EditCategoryTwoStep.php

final class EditCategoryTwoStep
{
  public $name;

  private $category;

  private $applied = false;

  public static function fromCategory(Category $category): self
  {
    return new self($category);
  }

  private function __construct(Category $category)
  {
    $this->name = $category->getName();
    $this->category = $category;
  }

  public function apply(): void
  {
    if ($this->applied) {
      throw new \LogicException();
    }

    $this->applied = true;
    $this->category->rename($this->name);
  }
}