News Feed
Jobs Feed
Sections




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

Andrew Podner:
Using Final to Prevent Overrides and Extension
November 26, 2012 @ 10:36:05

In the latest post to his site Andrew Podner takes a quick look at something you don't see too much in PHP applications but is a familiar concept to some coming in to the language from others - using "final" to prevent overrides of the code in your classes.

In a previous post about inheritance, I showed you how to extend a class. One aspect of extending classes that wasn't fully covered was the idea of overriding a method in a class. You can override a method (function) from the base class by simply redefining the method in the child class. [...] There are times though, when you do not want a method to ever be overridden. There may even be cases where you do not want a class to be extended.

His example shows how to use this "final" keyword on a database class, protecting a method (getRecord) that could potentially break the application if changed. This would then give the developer trying to extend the class an error noting that that method cannot be overridden. One thing to note, if you're going to use "final" in your code, be sure you know what you're doing. More often than not, you probably just want something like "private" or "protected" (see this post for a bit more explanation).

0 comments voice your opinion now!
final class method tutorial visibility extend override


blog comments powered by Disqus

Similar Posts

DevShed: Retrieving Information on Several Objects with Destructors in PHP 5

PHPRiot.com: Zend Framework 101: Zend_Soap

Stuart Herbert's Blog: Quick Tip: Get, Set and Query in One Method

IBM developerWorks: What's new in PHP V5.2, Part 4: Using the new ZIP extension

Richard Heyes\' Blog: PHP Console Class


Community Events











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


unittest composer application symfony2 introduction package framework database install release facebook podcast performance hhvm security hack opinion support language component

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