News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Zend Developer Zone:
Liskov Substitution Principle...attempted
June 07, 2011 @ 11:09:41

In a previous post to the Zend Developer Zone Keith Casey talked about the SOLID principles of software development, a set of guidelines that can help to make software more maintainable and easier to work with. In this new post he looks at the "L" in SOLID, the Liskov Substitution Principle.

So the Liskov Substitution Principle boils down to: method/class preconditions cannot be strengthened, method/class post conditions can't be weakened, all exceptions thrown must equally interchangeable and method signatures should be completely compatible.

To help make this all a bit clearer, he includes some code showing a basic class (Rectangle) and how difficult it can be to try to appease all of the principles above without the "fix one, break another" scenario. On comment to the post suggests something that might help things a bit - programming by contract.

0 comments voice your opinion now!
solid software development liskov substitution principle


blog comments powered by Disqus

Similar Posts

Zend Developer Zone: Chris Hartjes on Learning From Ruby on Rails

Zend Developer Zone: Liskov Substitution Principle...attempted

Tony Bibbs' Blog: Fed Up of Framework Hype

Sebastian Bergmann's Blog: RC2 Is The New RC1 (PHPUnit)

Freek Lijten's Blog: SOLID - The S is for Single responsibility


Community Events

Don't see your event here?
Let us know!


library release framework performance podcast opinion php7 laravel configure introduction interview community series application conference api example language install symfony2

All content copyright, 2015 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework