News Feed
Sections




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

Freek Lijten's Blog:
SOLID - The O is for Open Closed Principle
May 07, 2012 @ 10:45:37

Freek Lijten has posted the second part of his series looking at the SOLID development methodology. In this latest post his looks at the second letter in the acronym - "O" for "Open Closed Principle."

Software that requires an enormous amount of changes to implement one new feature or fix a bug is unstable and should be considered as "bad". Software should be designed so, that in case of a new feature, no existing classes should have to change. In other words: it is closed for modification. Existing software may be extended to achieve new features however.

He starts off with a "What" section explaining a bit more about what this open/closed means for your code and gets into an example showing it in a more practical way. He shows how to take the principle and refactor an API connector class to pass in the object it needs (Bike) and use that to get information (rather than just passing in the data). He uses a Factory to get the object type he needs based on the Bike type.

0 comments voice your opinion now!
solid development principles open closed principle


blog comments powered by Disqus

Similar Posts

Tiger Heron Blog: A Tale of Two Patterns

Greepit.com: Behavior Driven Development Framework for PHP: Behat

Brandon Savage's Blog: Painless Spec and Schedule Development

Marc Gear's Blog: Is PHP a solid job prospect?

Zend Developer Zone: Mike Potter Announces "The (Unofficial) Adobe PHP SDK"


Community Events





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


library deployment podcast framework interview community laravel release opinion package bugfix tips symfony series install zendserver introduction language api update

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