News Feed
Sections




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

Matthew Weir O'Phinney's Blog:
Extending Singletons
February 06, 2007 @ 09:27:00

Matthew Weir O'Phinney wonders about singletons. He wonders how he can make them more flexible than they even are by making entire custom singletons accessible later, after they've been created.

This morning, I was wondering about how to extend a singleton class such that you could retrieve the new class when retrieving the singleton later. In particular, Zend_Controller_Front is a singleton, but what if I want to extend it later? A number of plugins in the Zend Framework, particularly view helpers and routing functionality, make use of the singleton; would I need to alter all of these later so I could make use of the new subclass?

He gives two code examples to illustrate his point - one that uses the current Zend_Controller_Front implementation to extend an instance and the other with a slightly modified version to do the same. The change is in the declaration of the $_instance value. By making it protected, the differently extended instance will be created. With the normal setting (private) you'll only ever get back the same default Zend_Controller_Front instance.

Check out the comments for some other suggestions as well.

0 comments voice your opinion now!
extend singleton controller front instance private protected extend singleton controller front instance private protected


blog comments powered by Disqus

Similar Posts

PHPied.com: AJAX MVC (so to speak)

Ben Ramsey: Setting Up Jenkins on Amazon Linux for PHP Testing

RubySource.com: Confessions of a Converted PHP Developer: On Visibility and Privates

Alexander Netkachev's Blog: How to use Zend Framework Controller/Action approach?

Chris Hartjes' Blog: Converting Legacy Apps to CakePHP, Part 3


Community Events

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


conference php7 performance podcast opinion api symfony2 application language release introduction community install interview example configure laravel part2 framework series

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