gistfile1.txt

#Jae Redirect
Options +FollowSymLinks -MultiViews
RewriteEngine On
RewriteBase /

# This will redirect you from http://www.example.com/username.php to http://www.example.com/username externally                                                          
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s([^.]+)\.php [NC]
RewriteRule ^ %1 [R,L]

# This will redirect you from http://www.example.com/username to http://www.example.com/username internally   
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*?)/?$ $1.php [L]