RewriteEngine on
RewriteCond %{HTTP_REFERER} !^http://(www.)?localhost [NC]
RewriteCond %{HTTP_REFERER} !^http://(www.)?localhost.*$ [NC]
RewriteRule .(php)$ - [F]

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^http://?meusite.self.net [NC]
RewriteCond %{HTTP_REFERER} !^http://?meusite.self.net.*$ [NC]
RewriteRule .(php)$ - [F]