Server side browser detection

Recently, I've been faced with the task to detect user's devices browsers and redirect users to the different sites accordingly.
So, I've  made a search and found out this script for HTTP server (http://detectmobilebrowsers.com/). This script detects many mobile browsers, even my old symbian E52 was detected.
IPad devices are not detected. It's up to you to decide weather should your users be redirected to the mobile versions of your site. So, the real problem for me is how to detect iPad mini?
Http user agent for iPad 2 and iPad mini are the same. You can check the blog here (http://www.mobilexweb.com/blog/ipad-mini-detection-for-html5-user-agent). If anybody can find the solution to this problem, please, share your knowledge.