News Feed
Sections




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

DevShed:
Violating the Liskov Substitution Principle - PHP
June 30, 2011 @ 08:36:31

On DevShed today there's a new tutorial posted talking about the Liskov Substitution Principle (part of the SOLID set of principles) and how to use it in a practical example using some object-oriented PHP.

However, not all is bad with Inheritance. When used properly it can be a great ally. The question that comes to mind is: how can you keep away from building derivatives that behave totally different from the chosen abstraction(s)? Here's exactly where the Liskov Substitution Principle (LSP) comes into play.

They choose to illustrate the principle in the form of a view renderer that, when an unintentional issue happens, throws a new exception. He creates the abstract class to generate the view objects and creates a few child objects that extend it. using these, he creates a set of templates that render a header/footer/body with the data given. The problem comes up when he tries to work with his objects and a partial view instead of a composite view is passed in.

It's a complicated situation to follow, but it does help make the principle a bit more clear. I'd suggest following it all the way through and possibly even trying out their code (included) to make it even more clear.

0 comments voice your opinion now!
liskov substitution principle tutorial view render exception


blog comments powered by Disqus

Similar Posts

The Bakery: Six New Articles/Tutorials Posted

DevShed: Understanding Static Properties with PHP 5

Jason Houle's Blog: Zend Framework: The Dijit Editor

PHP-GTK Community Site: Extending GtkMenu class for Popup menu dialog

John Lim's Blog: Parallel Processing in PHP


Community Events





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


threedevsandamaybe podcast series interview symfony2 opinion release laravel framework unittest language list testing introduction code api developer community install refactor

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