Can anyone please help with the following rewrite for apache?
Imagine I have the domain domain.com
What I want:
If people request www.domain.com then return www.domain.com (ie index.php in my root directory)
If people request subA.subB.domain.com then return www.domain.com?sub=subA.subB
If people request sub.domain.com then return www.domain.com?sub=sub
If people request domain.com then return www.domain.com
I know the rule here is to work on it yourself. I have. For example, the similar question here asks to redirect to /subA/subB - but even if I understood that answer I would not know how to adapt it to what I need, which is ?sub=subA.subB . I have tried to understand rewrite many times over the years. Ok, /sobstory -off.
This will rewrite your subdomains:
RewriteEngine on
RewriteCond %{QUERY_STRING} !^sub=
RewriteCond %{HTTP_HOST} ^(?!www\.)(.+)\.domain\.com$
RewriteRule ^(/?)$ $1?sub=%1
Replace the domain as appropriate. Make sure each . has a slash before it as it does now.
It will only work for the index page. If you want it to work when there is something after domain.com/ let me know.
As for making http://domain.com work, I suggest redirecting that to www.domain.com so you don't get duplicate content issues from search engines. Do that with this (add it below the above):
RewriteCond %{HTTP_HOST} =domain.com
RewriteRule ^ http://www.domain.com%{REQUEST_URI} [R=301,L]
No need for the slashes before the dots on that one.
Let me know if any of that is no good for you.
Original poster's postscript based on comments:
The above solution is correct for the question but assumes the following configurations on the server: