News Feed
Sections




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

Joshua Thijssen's Blog:
SPL Using the iteratorAggregate interface
December 06, 2011 @ 08:28:45

Joshua Thijssen has a recent post spotlighting a part of the Standard PHP Library (SPL) that implements that Traversable interface, the IteratorAggregate interface.

Together with its more famous brother "Iterator", they are currently the two only implementations of the "Traversable" interface, which is needed for objects so they can be used within a standard foreach() loop. But why and when should we use the iteratorAggregate?

He answers his question with an example - a book that contains chapters. With a normal iterator you'd have to define standard functions (like valid, rewind or key). Using the IteratorAggregate you can push items into an internal array (like chapters in a book) and call a "getIterator" method to get this set. He also takes it one step further and shows implementing the "Count" interface to make it easier to get a total count of the items in the iterator. Sample code is included to help clarify.

0 comments voice your opinion now!
spl iteratoraggregate interface traversable count


blog comments powered by Disqus

Similar Posts

GoodPHPTutorials.com: Integrating the Authorize.Net AIM API with PHP

Joshua Thijssen: SPL Deepdive: RegexIterator

Andreas Gohr's Blog: Google Chart API via PHP

Evan Sims' Blog: Announcing libGameFly

Marc Morera: Bye Bye Symfony


Community Events





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


version symfony release language series framework unittest conference interview configure list introduction opinion podcast composer extension voicesoftheelephpant api community laravel

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