Useing local conf file

I want to "rewrite module", but nginx.com, since I use shared hosting

My account root is : /home/user/
My web page root is /home/user/www/
Site is here: http://user.site.net

What I can do?


Since it is so easy for who know, I ask one more question.
I want files of the form:

http://user.site.com/path/file{value}.php
(here value is any escaped string)

to be executed in /home/user/www/path/file.php

where $_GET['url'] must be "value" (see above).
What to write exactly to conf file, to have this functionality?