codeigniter 用.htcaccess做动态二级域名解析

今天将服务器php版本升到了5.4.4，然后将之前的一个项目改用apache,动态二级转向用.htcaccess，共享一下

AuthName "yousite Website Coming Soon..."  //如果你想给你的网站加个权限访问
AuthType Basic 
AuthUserFile D:/xxx/.htpasswd  #如果你想设置密码访问 如何生成.htpasswd可以访问 http://www.htaccesstools.com/htpasswd-generator/
#AuthGroupFile /dev/null 
require valid-user

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /

    #Removes access to the system folder by users.
    #Additionally this will allow you to create a System.php controller,
    #previously this would not have been possible.
    #'system' can be replaced if you have renamed your system folder.
    RewriteCond %{REQUEST_URI} ^system.* 
    RewriteRule ^(.*)$ /index.php?/$1 [L]

    #When your application folder isn't in the system folder
    #This snippet prevents user access to the application folder
    #Submitted by: Fabdrol
    #Rename 'application' to your applications folder name.
    RewriteCond %{REQUEST_URI} ^application.*
    RewriteRule ^(.*)$ /index.php?/$1 [L]


    <IfModule mod_proxy.c>
      # Redirect to boutique (with any trailing path)
      RewriteCond %{HTTP_HOST} !^www. [NC]
      RewriteCond %{HTTP_HOST} ^([^.]+).yousite.com(.*)$ [NC]
      RewriteRule ^(.*)$ http://www.yousite.com/boutique/$1$2 [P,L]
    </IfModule>

    <IfModule !mod_proxy.c>
      # Redirect to boutique (with any trailing path)
      RewriteCond %{HTTP_HOST} !^www. [NC]
      RewriteCond %{HTTP_HOST} ^([^.]+).yousite.com(.*)$ [NC]
      RewriteRule ^(.*)$ http://www.yousite.com/boutique/%1/$1 [R=301,L]
    </IfModule>

    ## Otherwise, force www;
    RewriteCond %{HTTP_HOST} ^yousite.com$ [NC]
    RewriteRule ^(.*)$ http://www.yousite.com/$1 [R=301,L]

    #Checks to see if the user is attempting to access a valid file,
    #such as an image or css document, if this isn't true it sends the
    #request to index.php
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>

<IfModule !mod_rewrite.c>
    # If we don't have mod_rewrite installed, all 404's
    # can be sent to index.php, and everything works as normal.
    # Submitted by: ElliotHaughin

    ErrorDocument 404 /index.php
</IfModule>