----------------- .htaccess ---------------

Options +FollowSymLinks

RewriteEngine On

RewriteCond %{SCRIPT_FILENAME} !-f
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteRule ^(.+)$ index.php?i=$1 [QSA,L]


--------------- (index.php) -----------------

<?php
if (!empty($_GET['i'])) { echo $_GET['i']; }
?>