Nice URLS PHP .htaccess

.htaccess
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ $1.php [L,QSA]
# http://www.xiaokyun.com/about -> http://www.xiaokyun.com/about.php

.htaccess
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]
# http://www.xiaokyun.com/about -> http://www.xiaokyun.com/index.php?q=about

<?php
// $url_data is an array
$url_data = explode("/",$HTTP_SERVER_VARS[‘PATH_INFO’]);
?>