location ~ \.php$ {
proxy_cache none;
}

it should do the trick

++ jerome
2009/5/28 perlish <nginx-forum@nginx.us>:
> Hi all:
> When I use nginx-0.7.59 as a revers proxy and cache server,it also cache the php file,how to make it not cache php file ?
> I thought the php file is not need to be cached.
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,2437,2437#msg-2437
>
>
>