[development] Note that PHP arrays are fast

Doug Green douggreen at douggreenconsulting.com
Tue Apr 10 13:59:48 UTC 2007

My two cents are added to the closed ticket http://drupal.org/node/134697


* modulo is slower than bitwise-and and I think that this was the main
culprit to the even/odd flip performance
* microtimer is not a benchmarking tool

Doug Green
Bringing Ideas to Life with Software Artistry and Invention...
Providing open source software political solutions

-----Original Message-----
From: development-bounces at drupal.org [mailto:development-bounces at drupal.org]
On Behalf Of Karoly Negyesi
Sent: Monday, April 09, 2007 8:19 PM
To: development at drupal.org
Subject: [development] Note that PHP arrays are fast


Note my trick in http://drupal.org/node/134697 which shows that the hash  
lookups in Zend Engine are a bit faster than branching.

Instead of

   $class = $class == 'even' ? 'odd' : 'even'

we have

   $flip = array('even' => 'odd', 'odd' => 'even');
   $class = $flip[$class];

The first can be as much as 10% slower. I will explore this area further  
and I recommend everyone to familiarize themselves with the vast array of  
php array functions :) because next Drupal will be even more abound with  



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