Php-guide.7z Apr 2026

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 not be forced to implement methods it does not use. php-guide.7z

The acronym represents five essential rules for high-quality software architecture: S: Single Responsibility Principle (SRP) If a Bird class has a fly() method,

Depend on abstractions (interfaces), not concrete implementations. php-guide.7z

Objects of a superclass should be replaceable with objects of its subclasses without breaking the application.