Matthiasexample.php

<?php

namespace OrderExample
{
    interface Order
    {
        public static function create(OrderId $orderId, DateTimeImmutable $orderDate) : Order;
        public function addLine(LineNumber $lineId, ProductId $productId, Quantity $quantity) : void;
    }

    class OrderTalisORM implements Order
    {
        public static function create(OrderId $orderId, DateTimeImmutable $orderDate) : Order
        {
            //custom code for Doctrine implementation
        }

        public function addLine(LineNumber $lineId, ProductId $productId, Quantity $quantity) : void
        {
            //custom code for Doctrine implementation
        }
    }

    class OrderDoctrine implements Order
    {

        public static function create(OrderId $orderId, DateTimeImmutable $orderDate) : Order
        {
            //custom code for Doctrine implementation
        }

        public function addLine(LineNumber $lineId, ProductId $productId, Quantity $quantity) : void
        {
            //custom code for Doctrine implementation
        }
    }

    class OrderProoph implements Order
    {
        public static function create(OrderId $orderId, DateTimeImmutable $orderDate) : Order
        {
            // ES implementation
        }

        public function addLine(LineNumber $lineId, ProductId $productId, Quantity $quantity) : void
        {
            // ES implementation
        }

        public function apply(ProofEventInterface $event)
        {
            //big ugly switch for AR events
        }
    }
}