Php-guide.7z <2K FHD>

You should be able to add a new payment method (e.g., Stripe) by creating a new class that extends a base interface, rather than rewriting your existing checkout logic. L: Liskov Substitution Principle (LSP)

The acronym represents five essential rules for high-quality software architecture: S: Single Responsibility Principle (SRP) php-guide.7z

Objects of a superclass should be replaceable with objects of its subclasses without breaking the application. You should be able to add a new payment method (e

A class should not be forced to implement methods it does not use. If a Bird class has a fly() method,

If a Bird class has a fly() method, a Penguin subclass shouldn't override it to throw an error, as this violates the expectation that all birds in the system can fly. I: Interface Segregation Principle (ISP)

A class should have one, and only one, reason to change.