News Feed
Sections




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

DZone.com:
Reuse your closures with functors
December 29, 2010 @ 10:50:19

On DZone.com there's a new tutorial from Giorgio Sironi about reusing closures with the help of functors (a special kind of object instancing done in PHP with the help of __invoke).

I like PHP closures and their superset, anomyous functions, as they implement the Command pattern very well when used correctly. However I feel that sometimes they are: difficult to reuse and difficult to force contracts on. [...] What if we wanted instead, a closure which we can instance even more than one time (maybe with different variables), and that we could type hint?

He shows how to make this possible with a functor created using the __invoke magic method of PHP to handle the request to an object like a function. He includes some sample code to show it in action - a basic callback (SquareCallback) and how it compares to calling a normal closure. It also shows something a bit more technical, an "AdderCallback" class that can be defined as a type hint on a function.

0 comments voice your opinion now!
closure functor invoke snippet example callback typehint


blog comments powered by Disqus

Similar Posts

Paul van Iterson's Blog: Why you want Object Oriented Programming in PHP

Rob Allen's Blog: What problem does dependency injection solve?

Rob Richards' Blog: WS-Addressing for ext/soap

PHP-GTK Community Site: Add icons to GtkMenu

php|architect Blog: Less Code isnít Always Better


Community Events





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


version symfony opinion install laravel tool introduction update composer interview language podcast security series release community framework package voicesoftheelephpant library

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