使用子域值作为$ _GET变量[重复]

Currently my site url is set up using mod_rewrite and $_GET variables to load different content. Like this:
mysite.com/subsite/var1/var2

I'd like to change that format to look like this:
subsite.mysite.com/var1/var2

Is there an easy way to do this, or do I need to completely redesign my site's backend?

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Use the following code, This will work for you which you want.

    Options +FollowSymlinks
    RewriteEngine on
    RewriteRule ^([a-zA-Z]).mysite.com\$ mysite.com/$1 [NC]

Something like this should work,

RewriteEngine on
RewriteBase /
RewriteCond %{HTTP_HOST} ^(www\.)?[^.]+\.mysite\.com.*$
RewriteRule (.*) subsite/$1 [L]