Drupal: create a module

• choose name: simple_search
• create module folder: sites/all/modules/custom/simple_search

• sites/all/modules/custom/simple_search/simple_search.info

; $Id$
name = Simple Search
description = Simplify default search
package = Custom
core = 6.x

• sites/all/modules/custom/simple_search/simple_search.module

<?php
// $Id$
 
/**
 * @file
 * Simplify default search
 */
 
// ...your custom PHP code here...

• Remember to enable your module at /admin/build/modules
• Module folder can be placed directly in sites/all/modules, custom folder is only for convenience