[help].htaccess image hotlinking for php url's

the typical solution is

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?site.com [NC]
RewriteRule \.(gif)$ site.com/nohotlink.gif [L]

Code (markup):

but the problem is my image url are like

img.php?n=123

Code (markup):

if i put RewriteRule \.(php) is blocking all the php not the images
any ideas ?

 

You can use PHP to block referrers that arent your sites URL.

returns the referring URL