htaccess 实现网址缩短

访问 ：app.xxx.com/a

解析到：app.xxx.com/index.php/app/a

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule http://app.xxx.com  http://m.xxx.com

RewriteCond %{HTTP_HOST} app.xxx.com
RewriteCond %{REQUEST_URI} !^/index.php
RewriteRule ^(.*)$  /index.php/app/$1 
</IfModule>