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

Sebastian Bergmann's Blog: PHPUnit and Software Metrics

Job Posting: Sherlock Technology Recuriting Seeks Software Development Lead (Coral Gables, FL)

Paul Jones\' Blog: PHPBlox from Zend?

Stefan Mischook's Blog: The 'Good Enough' Principle and PHP

PHP.net: PHP 5.6.0RC2 is available


Community Events





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


release language refactor testing community framework opinion configure laravel list series wordpress developer podcast introduction threedevsandamaybe interview code install unittest

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework