Php-guide.7z [ VERIFIED — Anthology ]

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 PaymentProcessorInterface rather than a specific PayPalPayment class. 📦 Understanding the .7z Context php-guide.7z

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) In Laravel or standard PHP, a UserController should

Instead of one massive WorkerInterface , create smaller interfaces like WorkableInterface and SleepableInterface so a robot class isn't forced to implement a sleep() method. D: Dependency Inversion Principle (DIP) In Laravel or standard PHP