<Files *.php>
    Order Deny,Allow
    Deny from all
</Files>

<Files index.php>
    Order Allow,Deny
    Allow from all
</Files>

<Files update.php>
    Order Allow,Deny
    Allow from all
</Files>

<Files radius.php>
    Order Allow,Deny
    Allow from all
</Files>

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-d
RewriteRule ^(.*)$ index.php [QSA,L]