会话cookie适用于所有子域

i have my site set up like this:

RewriteCond %{HTTP_HOST} !^www\.example\.com
RewriteCond %{HTTP_HOST} ([^.]+)\.example\.com [NC]
RewriteRule ^/?$ /user/profile.php?name=%1 [L]

what this does is if user visits: test.example.com, it will show contents of folder: example.com/user/profile.php?name=test. if someone goes to lol.example.com, it will show page: example.com/user/profile.php?name=lol

Question 1:

right now, I have a problem with it. if i go to test.example.com/login, it will show my domain root file. how can i make it so that it will show things from /user folder? for example: test.example.com/login will show example.com/user/login and test.example.com/register will show example.com/user/register?

Question 2: SOLVED

right now if i log in on the subdomain, the session cookie (PHP) is only set for the subdomain. how can i make the cookies work for the whole site with (example.com) domain?

thanks

UPDATE: for example: test.example.com/pathtofile should get the contents of example.com/user/pathtofile. "pathtofile" should be dynamic. i just want the path to look in the folder /user, not the root folder.

Try something like this

RewriteCond %{HTTP_HOST} !^www\.example\.com
RewriteCond %{HTTP_HOST} ([^.]+)\.example\.com [NC]
RewriteRule ^/?$ /user/profile.php?name=%1 [L]
RewriteRule (.*) /user/$1 [L]