An example dispatch.php script.

<?php

/* Global security measures */

switch ($_GET['task'])
{
    case 
'print_form':
        include 
'/inc/presentation/form.inc';
        break;
    case 
'process_form':
        
$form_valid false;
        include 
'/inc/logic/process.inc';
        if (
$form_valid)
        {
            include
            
'/inc/presentation/end.inc';
        }
        else
        {
            include
            
'/inc/presentation/form.inc';
        }
        break;
    default:
        include
        
'/inc/presentation/index.inc';
        break;
}
?>