Where is third level of domain gone

[fei dong]

Hello,

I am using Nginx 0.7.54 with php 5.2.8 as the web server. When I configure
the host name, like: *.music.goog.com, I find a very wield phenonmenon that
I can't get the third level of this domain.

I print this variable in php:
$_SERVER['SERVER_NAME'] ; it says: music.goog.com

my nginx.conf follows like:
    server
    {
        listen       80;
        server_name  music.goog.com *.music.goog.com;
        index index.html index.htm index.php;
    ...
    }

The requirement is I wanna get the third level of domain which is the short
code of countries, (ex: ar, br, cn, us) to set the cookies then redirect to
the concerned page. My idea is to redirect in the php page. I try to use url
parameters with "?country=us" to implement. It's ok but it's no use when
users only input "http://ar.music.goog.com" or to show confusing result with
"http://ar.music.goog.com/?country=us"

Hoping the experts reply.
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