What are the potential issues with including the productFactory class within the shoppingcart class in PHP?

Including the productFactory class within the shoppingcart class violates the principle of separation of concerns and can lead to tightly coupled code. To solve this issue, we can instantiate the productFactory class outside of the shoppingcart class and pass it as a parameter to the shoppingcart class constructor.

class ProductFactory {
    // ProductFactory class implementation
}

class ShoppingCart {
    private $productFactory;

    public function __construct(ProductFactory $productFactory) {
        $this->productFactory = $productFactory;
    }

    // ShoppingCart class implementation
}

$productFactory = new ProductFactory();
$shoppingCart = new ShoppingCart($productFactory);