[development] Note that PHP arrays are fast

[Karoly Negyesi]

Hi,

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  
arrays.

Regards,

NK