How to create our profile url

[eluser]frozenmaiden[/eluser]
I try your solution and it work well in sub domain, but why it raise 404 error on main domain?

For example i have http://test.com and http://shop.test.com

i want if people access http://test.com/myprofile it will redirect to http://shop.test.com/myprofile

and

http://shop.test.com/myprofile will redirect it to their user profile.

hooks in http://shop.test.com/myprofile works like a charm, but hooks http://test.com/myprofile raise 404

errors. T_T

Code:

$_SERVER['REQUEST_URI'] = '/p/r'.$_SERVER['REQUEST_URI'];
$_SERVER['PATH_INFO'] = $_SERVER['REQUEST_URI'];
$_SERVER['QUERY_STRING'] = $_SERVER['REQUEST_URI'];
$_SERVER['REDIRECT_QUERY_STRING'] = $_SERVER['REQUEST_URI'];
$_SERVER['argv'][0] = $_SERVER['REQUEST_URI'];

i try to change all that server variable,but nothing to change,please help..

EDIT:
I solve the problems by myself, but get strange solution.. I change $config['uri_protocol']
on http://test.com to QUERY_STRING and it work perfectly.
That make me confuse,because on http://shop.test.com i set $config['uri_protocol'] to AUTO,
and no problems at all.:-S

NOTE: http://test.com and http://shop.test.com each have their own CI.