PHP Solid Principles Examples: Good and bad examples to show the SOLID principles

This package provides good and bad examples to show the SOLID principles.

It provides classes that show how to implement the SOLID principles in PHP.

The packages has classes showing the principles:

- Single responsibility: there should never be more than one reason for a class to change

- Open–closed: entities should be open for extension, but closed for modification

- Liskov substitution: Functions that use pointers or references to base classes must be able to use objects of derived classes without knowing it

- Interface segregatios: clients should not be forced to depend upon interfaces that they do not use

- Dependency inversion: Depend upon abstractions, not concretions