A class should have one, and only one, reason to change.
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)
The acronym represents five essential rules for high-quality software architecture: S: Single Responsibility Principle (SRP)
A class should not be forced to implement methods it does not use.
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)
Objects of a superclass should be replaceable with objects of its subclasses without breaking the application.
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