// State classes
final class DraftOrderState extends OrderState
{
    public function canBeSubmitted(): bool
    {
        return true;
    }
}

final class PendingOrderState extends OrderState
{
    public function canBeSubmitted(): bool
    {
        return false;
    }
}

// Transition class
final class SubmitOrderTransition extends Transition
{
    public function handle(): OrderState
    {
        // Validation and side effects

        return new PendingOrderState($this->order);
    }
}

// Usage
$order->status->transitionTo(PendingOrderState::class);