This config is built on an Ubuntu 11.04 server.
Software is nginx, php-fpm (php5-fpm).
For performance, it's recommended to run php-fpm in SOCKET mode, instead of accessing via IP:PORT. That is the method shown below.
There is an issue on Yii2 to redirecting / urls to /frontend/web.
In other words we need a way to hidden /frontend/web from addresses.
We will do this without changing Apache configuration and creating virtual host or setting document root (It's good for share hostings that we have not access to apache.conf)