News Feed
Sections




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

PHPMaster.com:
Understanding Recursion
June 06, 2013 @ 09:32:41

On PHPMaster.com today there's a new tutorial posted that talks about something that can be a more difficult concept for budding developers to grasp - recursion.

In one of my previous articles I wrote about iterators and how you can use them. Today I'd like to look at the fraternal twin of iteration: recursion. A recursive function is one that calls itself, either directly or in a cycle of function calls. Recursion can also refer to a method of problem solving that first solves a smaller version of the problem and then uses that result plus some other computation to formulate an answer to the original problem.

He starts with an example - one function showing how to calculate a factorial using just looping and the other by having the function call itself. He talks some about the different types of recursion (direct/indirect) and gives a more practical example, a "find in array" function for one with nested subarrays. He also briefly mentions "head" and "tail" recursion, the difference being if it waits for a return value or not. He also offers some general advice when it comes to using recursion and how you have to watch for optimization issues.

0 comments voice your opinion now!
recursion tutorial introduction head tail direct indirect

Link: http://phpmaster.com/understanding-recursion

blog comments powered by Disqus

Similar Posts

DevShed: Building an Image Generator Class with PHP 5

Carson McDonald's Blog: Google OAuth for Installed Apps PHP Example

Phpro.org: Introduction to PHP and MySQL

Elizabeth Smith's Blog: How to Compile PHP5.2 and PHP-GTK2 on Windows using Visual C++ Express

Chris Shiflett\'s Blog: ZF Tutorial Update


Community Events





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


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

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