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If you are in the unfortunate position of having your sites living on a host that doesn't support multiple domains, you may be forced to roll your own with .htaccess and mod_rewrite. So long as your physical directory structure is well thought-out, this is fairly simple to achieve.

For example, let's say we have two domains, pointing at a single hosted root; domain-one.com and domain-two.com. In our web server root, we simply create a folder for each domain, perhaps one/, and two/ then in our main (root) .htaccess, rewrite all incoming requests, like this..

All requests NOT already rewritten into these folders, transparently rewrite..

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    #two domains served from one root..
    RewriteCond %{HTTP_HOST} domain-one.com
    RewriteCond %{REQUEST_URI} !^/one
    RewriteRule ^(.*)$ one/$1 [L]

    RewriteCond %{HTTP_HOST} domain-two.com
    RewriteCond %{REQUEST_URI} !^two
    RewriteRule ^(.*)$ two/$1 [L]

All requests for the host domain-one.com are rewritten (not R=redirected) to the one/ directory, so long as they haven't already been rewritten there (the second RewriteCond). Same story for domain-two.com. Note the inconsistency in the RewriteCond statement; !^/dir-name and !^dir-name should both work fine.

Also note, with such a simple domain & folder naming scheme, you could easily merge these two rule sets together. This would be unlikely in the real world though, which is why I left them separate; but still, worth noting.

Other general settings and php directives can also go in this root .htaccess file, though if you have any further rewrite you'd like to perform; short URL's, htm to php conversion and what-not; it's probably easier and clearer to do those inside the sub-directory's .htaccess files.

I have a also a query similarily to that one. My problem is that I have a lot of domains in one root. I want to force www in the begining of all the domains pointed to that root folder. can any one help. Its a matter of urgent.

Finally I got the solution by myself wandering over the net. Here is the solution:P

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RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]