Examples for presentation.

sources/Example/Good/Product.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Example\Good;
+
+class Product
+{
+    public string $sku = '';
+    public int $quantity = 0;
+    public float $price = 0;
+
+    public function setSku(string $sku): Product
+    {
+        $this->sku = $sku;
+        return $this;
+    }
+
+    public function setQuantity(int $quantity): Product
+    {
+        $this->quantity = $quantity;
+        return $this;
+    }
+
+    public function setPrice(float $price): Product
+    {
+        $this->price = $price;
+        return $this;
+    }
+
+
+    /**
+     * Instead of this better to use some DAO lib like JMSSerializer, or cuyz/valinor.
+     */
+    public function setData(array $data): Product {
+        $this->sku = $data['sku'] ?? '';
+        $this->quantity = $data['amount'] ?? 0;
+        $this->price = $data['price'] ?? 0;
+
+        return $this;
+    }
+
+    /**
+     * @param Product[] $destinationProducts
+     * @param Product[] $sourceProducts
+     */
+    public static function copyQuantities(array $destinationProducts, array $sourceProducts ) {
+        $indexedBySku = [];
+        foreach ($destinationProducts as $destinationProduct) {
+            $indexedBySku[$destinationProduct->sku] = $destinationProduct;
+        }
+
+        foreach ($sourceProducts as $sourceProduct) {
+            if ( !array_key_exists($sourceProduct->sku, $indexedBySku) ) {
+                continue;
+            }
+            $indexedBySku[$sourceProduct->sku]->setQuantity($sourceProduct->quantity);
+        }
+    }
+}