upstream php71 {
    server unix:/run/php/php7.1-fpm.sock;
}

upstream php72 {
    server unix:/run/php/php7.2-fpm.sock;
}

map $http_host $php_backend {
    hostnames;
    
    *.appl      "php72";
    *.deve      "php71";
    
    default     "php72";
}

map $http_host $vhost_root {
    hostnames;
    
    *.deve      /var/www/$http_host/public_html;
    *.appl      /var/www/$http_host/public;
    
    default     /var/www/$http_host;
}