CODE EXAMPLE FOR PHP

hide .php

//Add this you .htaccess
Options +FollowSymlinks


RewriteEngine On


RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f


RewriteCond %{REQUEST_FILENAME} !-d

RewriteCond %{REQUEST_FILENAME}.php -f

RewriteRule ^(.+)$ /$1.php [L,QSA]