我如何用PHP检测任何手机导航器？

I only need to detect if is mobile device or not...

This is a good class to try:

http://code.google.com/p/php-mobile-detect/

You might want to try something like this if you want to know which device it is: http://www.hand-interactive.com/resources/detect-mobile-php.htm

Or if you don't care: http://mobiforge.com/developing/story/lightweight-device-detection-php

This is updated version of the PHP Mobile Detect:

http://code.google.com/p/php-mobile-detect2/