News Feed
Sections




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

Web Species Blog:
Lazy evaluation with PHP
June 01, 2011 @ 08:41:01

Juozas Kaziukenas has a new post to his Web Species blog about using "lazy evaluation" in PHP - loading the resources you need for execution and evaluation only as you need them, not all up front.

Recently I needed to process a huge array of data and because of PHP's somewhat inefficient variables and especially arrays that was resulting in "out of memory" errors. However, I couldn't use any other tools than PHP so was forced to come up with a solution implementation in it. Here is how I solved it using principles from functional languages.

He gives an example using Haskell to generate a Fibonacci sequence using its built-in lazy evaluation abilities. Unfortunately, PHP doesn't have such a thing built in, so he tries the next best thing - Iterators. He caries the idea over to the database side too, recommending fetch() in a loop over fetchAll() and some effective joins.

0 comments voice your opinion now!
lazy evaluation haskell functional iterator


blog comments powered by Disqus

Similar Posts

Blue Parabola Blog: The SPL Deserves Some Reiteration

Web Mozarts: Give the Traversable Interface Some Love

NetTuts.com: Functional Programming in PHP

Stubbles Blog: Lazy loading of classes stored in a session without __autoload()

Quality Assurance in PHP Projects: Testing Database Interaction


Community Events





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


code tips zendserver introduction series laravel podcast framework community application interview release list language development developer api threedevsandamaybe deployment conference

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