Subdomains as Userpages / Profilepages

[eluser]Unknown[/eluser]
I'm searching for a way to make subdomains ussable for
profilepages of users.

Ofcourse I need a wildcard in my DNS and Apache config, which is
already done and working.

Because I want to keep this way of subdomains flexible, I don't want
to use a .htaccess file so I need to do something with a route that
recognizes the subdomain and does something magic.

Something like this could work I think:

$usernamehost = explode(’.', $_SERVER['HTTP_HOST'], 2);

I have found a CI example that does explain it, but not in detail if you ask me. SO I'm confused how to use this. The blog itself also redirect to this forum, but still I can't find the right solution.

http://andy.sinaptix.com/2007/08/22/user...deigniter/

Has anyone done this already ?