index.php
--------------
<?php

// PARSING QUERY STRING
$QS=explode("&",$_SERVER['QUERY_STRING']);
$QS=explode('/',$QS[0]);

// IF Modul is Undefined set it to index
if (!$QS[0]) $MODUL='index';
else $MODUL=strtolower($QS[0]);

// WE can make a Variable $_QUERY
// for alternative _GET
for ($i=1;$i<count($QS);$i+=2)
{
$_QUERY[$NVAR]=$NVAR=$QS[$i];
$$NVAR=$QS[$i+1];
}

// Check the Modul is exists?
if (!file_exists("modul_directory/{ $MODUL }.php"))
$MODUL="index";

#### THIS IS EXAMPLE TO IMPLEMENTATION THE SCRIPT
// Load The Template
include("template.php");
// Load The Module
include("modul_directory/{ $MODUL }.php");
// Load The Footer
include("footer.php");

?>

we can access the modul in URL like this:
=================================

www.example.com/?forum/topic/20
- it mean load the modul forum.php, and set the _QUERY['topic']=20

www.foo.com/?voting/id/54/type/piechart&choice=2
- it mean load the modul voting.php, and set the _QUERY['id']=54 and _QUERY['type']='piechart' and set _GET['choice']=2