How can i get my htaccess to work (subdomains)?

Question

I'm sorta a noob at these things but I'm trying to make a simple virtual subdomain with .htaccess. I have wildcard enabled and after lots of digging, this is what I've come up with:

rewriteEngine On 
rewriteCond %{HTTP_HOST} !^$ 
rewriteCond %{HTTP_HOST} !^(www\.)?khpedia\.com$ [NC] 
rewriteCond %{HTTP_HOST}<->%{REQUEST_URI} ^(www\.)?([^.]+).*<->/([^/]+) [NC] 
rewriteCond %2<->%3 !^(.*)<->\1$ [NC] 
rewriteRule ^(.+) /%2/$1 [L]

My directory is setup as

-root
--wiki
----index.php
--test

Right now when I travel to wiki.khpedia.com, I get a page not found. When I travel to wiki.khpedia.com/index.php, it travels to wiki.khpedia.com/wiki/index.php. I am somehow also able to access wiki.khpedia.com/test. If it doesnt seem obvious yet, I want to be able to go to wiki.khpedia.com/index.php and see wiki.khpedia.com/wiki/index.php but not in my address bar. Sorry for the text block and thanks for the help.

Answer 1

RewriteCond ^(.*)$ /wiki/$1 [L]

I'm confused about where subdomains come into your question. Could you give some examples of URLs you want to access in the browser and what they should point to at the server?

EDIT | Ah, I see now, Wrikken's answer handles the subdomains correctly :)

Answer 2

This works on the Apache side:

RewriteCond %{HTTP_HOST} !^www\.khpedia\.com$ [NC]
RewriteCond %{HTTP_HOST} ^(.+).khpedia\.com$  [NC] 
RewriteRule ^(.*) /%1/$1 [L,QSA]

But you're wiki software might make up it's own mind about redirects / urls.