common.conf

index index.html index.htm index.php;

root /srv/www/$host/site;

location ~ \.php$ {
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $request_filename;

        include fastcgi_params;
}
location ~ ^/.+ {
        try_files $uri $uri/ $uri/index.html $uri/index.php @fall;
}
location @fall {
        root /srv/www/$host/site/a;
}
location / {
        root /srv/www/$host/site/a;
}