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

Devshed: Building a PHP ORM: Deploying a Blog

Joshua Thijssen's Blog: SPL: Using the iteratorAggregate interface

Andy Frey's Blog: JavaScript PHP Remoting Demonstration

Vinu Thomas' Blog: PHP and Serial Ports

Phil Bennett: Do We Need a Framework For That? Or Hurry Up PHP-FIG


Community Events





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


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

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