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Some examples about SOLID Design Principles in PHP

License: MIT License

PHP 100.00%

php solid principles

solid-php-example's Introduction

SOLID Principles Examples in PHP

Single Responsibility Principle (Example)

This principle is about actors and high level architecture.

A class should have one, and only one, reason to change.

Open Closed Principle (Example)

This principle is about class design and feature extensions.

A class should be open for extension, but closed for modification.

Liskov Substitution Principle (Example)

This principle is about subtyping and inheritance

Derived classes must be substitutable for their base classes.

Interface Segregation Principle (Example)

This principle is about business logic to clients communication.

Many client-specific interfaces are better than one general-purpose interface.

Dependency Inversion Principle (Example)

This principle wires up all other four principles in a single circle.

Depend upon abstractions. Do not depend upon concretions.

For more information about Object Oriented Design Principles, you can refer this slide

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solid-php-example's Issues

The example you show does not conform to Interface Segregation Principle

Although, you are segregating (breaking / granularizing) a larger Interface into smaller interfaces, however only granularizing a large interface into smaller interfaces does not serve the purpose of Interface Segregation Principle in S.O.L.I.D.

In object-oiented programming, the actual purpose of exposing the subsets of the functions of a (serving) implementation class to the client-code, through multiple (segregated) interfaces is to enable the client-side code to access only interface-specific (contextual / subset) functionality of the (serving) implementation class.

See P-15 and P-13 on the link below to understand the purpose of Interface Segregation Principle. That is a powerful feature for Extensibility: Interface Segregation Principle.

https://www.codeproject.com/Articles/18743/Interfaces-in-C-For-Beginners

Reusing/adapt your code

Hi!

Can you please add an MIT or CC license?
I would like to reuse your examples on my website.

Best regards.

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