为什么不来路由所有请求与mod_rewrite的的index.php文件，并使用PHP编写路由逻辑，这似乎这样更可靠的方式比写不同的重写规则？

Why not to route all requests to the index.php with mod_rewrite and use PHP to write the routing logic, which seems way more reliable way than writing distinct rewrite rules?

这么简单的.htaccess这一个

As simple .htaccess as this one

RewriteEngine on
RewriteBase /
RewriteCond  %{REQUEST_FILENAME} !-f
RewriteCond  %{REQUEST_FILENAME} !-d
RewriteRule  ^(.*)$ index.php?request=$1 [QSA,L]

和在index.php几行PHP code

And few lines of PHP code in the index.php

$client_name = strtok($_SERVER['HTTP_HOST'],".");
list ($cat,$subcat) = explode("/",trim($_GET['request'],"/"));