Php-guide.7z Apr 2026

A high-level OrderManager should depend on a generic PaymentProcessorInterface rather than a specific PayPalPayment class. 📦 Understanding the .7z Context

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) php-guide.7z

In Laravel or standard PHP, a UserController should only handle HTTP requests. It should not directly calculate payroll or send emails; those tasks belong in separate services or observers. O: Open-Closed Principle (OCP) A high-level OrderManager should depend on a generic

Objects of a superclass should be replaceable with objects of its subclasses without breaking the application. It should not directly calculate payroll or send

Classes should be open for extension but closed for modification.

A class should not be forced to implement methods it does not use.