Nginx domain + subdomain in one config file

server {
    listen 80;

    ...
    index index.php index.php index.htm;

    server_name mydomain.com www.mydomain.com;
  ...
}

server {
    listen 80;

    ...
    index index.php index.php index.htm;

    server_name subdomain.mydomain.com www.subdomain.mydomain.com;
  ...
}