How do I apply dependency inversion and interfaces?

Dependency inversion is a principle in software design that promotes decoupling software modules. It encourages us to depend on abstractions (interfaces) rather than concrete implementations. This is part of the SOLID principles of object-oriented design.

Example of Dependency Inversion in PHP


        <?php
        interface PaymentProcessor {
            public function processPayment($amount);
        }

        class PaypalProcessor implements PaymentProcessor {
            public function processPayment($amount) {
                // Logic to process payment through PayPal
                echo "Processing payment of $$amount through PayPal.";
            }
        }

        class StripeProcessor implements PaymentProcessor {
            public function processPayment($amount) {
                // Logic to process payment through Stripe
                echo "Processing payment of $$amount through Stripe.";
            }
        }

        class ShoppingCart {
            private $paymentProcessor;

            public function __construct(PaymentProcessor $processor) {
                $this->paymentProcessor = $processor;
            }

            public function checkout($amount) {
                $this->paymentProcessor->processPayment($amount);
            }
        }

        // Usage
        $cart = new ShoppingCart(new PaypalProcessor());
        $cart->checkout(100); // Outputs: Processing payment of $100 through PayPal.
        ?>

How do I apply dependency inversion and interfaces?

Example of Dependency Inversion in PHP

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How do I apply dependency inversion and interfaces?

Example of Dependency Inversion in PHP

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