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)
The .7z extension indicates a compressed archive created with . In the context of a "PHP Guide," this archive likely contains: SOLID Principles in Laravel & PHP: A Practical Guide
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
Depend on abstractions (interfaces), not concrete implementations.
A class should have one, and only one, reason to change. In Laravel or standard PHP, a UserController should
Classes should be open for extension but closed for modification.
Objects of a superclass should be replaceable with objects of its subclasses without breaking the application. In the context of a "PHP Guide," this
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)