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
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) php-guide.7z
A class should not be forced to implement methods it does not use. php-guide.7z
Objects of a superclass should be replaceable with objects of its subclasses without breaking the application. php-guide.7z