Make nginx use PHP-FPM instead of HHVM for specific script

i think u can get necessary help by following this: https://bjornjohansen.no/hhvm-with-fallback-to-php

[and it might be best way to use fallback]

It works but I think that now it’s using PHP for everything. Before it looked like this

upstream hhvm {
        server unix:/var/run/hhvm/hhvm.sock;
}

upstream php {
        server unix:/var/run/php5-fpm.sock;
}

Edit the upstream directive of hhvm and set PHP FPM as a backup server:

upstream hhvm {
    server 127.0.0.1:8000;
    server unix:/run/php5-fpm.sock backup;
}