将url重写为子域名（带有htaccess的Codeigniter）

I have a question about my htaccess and codeigniter, I've been experimenting with my HTACCESS for a while. I want to rewrite a specific url(with its parameters) to specific subdomain, for example:

example.com/member/*

to:

member.example.com/*

my htaccess currently looks like this:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d

RewriteCond "%{HTTP_HOST}"   "!^www\.example\.com" [NC]
RewriteCond "%{HTTP_HOST}"   "!^example\.com" [NC]
RewriteRule /member/(.*)     "http://member.example.com/$1"

RewriteRule ^.*$ - [NC,L]
RewriteRule ^.*$ index.php [NC,L]

how can i do this?

You can use the following rule in htaccess to rewrite subdomain.

RewriteEngine On

 #If the host is "sub.domain.com"
 RewriteCond %{HTTP_HOST} ^sub.domain.com$ [NC]
 #Then rewrite any request to /folder
 RewriteRule ^((?!folder).*)$ /folder/$1 [NC,L]

Here, Replace sub.domain.com with your subdomain name and folder with the name of your folder you want to point your subdomain to.