我有这样的站点地图：
-js
-php
-css
-user
-user1
-files //folder i want to remain blocked
-index.php //main file i want to unblock
-user2
-files //folder i want to remain blocked
-index.php //main file i want to unblock
-user3
.
.
user1，user2是根据用户动态创建的文件夹。 如何使用中央htaccess文件？