Nginx config for multiple hosts, multi-user, multi-project

multiple.conf

server {
        listen 80;
        server_name ~^(?<project>.+)\.(?<username>.+)\.hhvm\.dyninno\.net$;

        if (!-d /home/$username/public_html/$project) {
                return 405;
                break;
        }

        set $root /home/$username/public_html/$project;

        # if public/index.php exists, assume that is the index file
        # modern PHP frameworks have document root in /public subfolder
        if (-f $root/public/index.php) {
                set $root $root/public;
        }

        root $root;

        access_log /var/log/nginx/hhvm.dyninno.net-access.log;
        error_log  /var/log/nginx/hhvm.dyninno.net-error.log info;

        index index.php;

        location / {
                try_files $uri $uri/ /index.php?$query_string;
        }

        location ~ \.(svn|git|hg|bzr|cvs|ht) { deny all; }
        location ~ /(favicon.ico|robots.txt) { log_not_found off; access_log off; }

        #include php7.conf;
        include hhvm.conf;
}