Php-guide.7z 〈PREMIUM • 2025〉

Depend on abstractions (interfaces), not concrete implementations.

Classes should be open for extension but closed for modification. 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) Depend on abstractions (interfaces)

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