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Andy Moore is a dotMobi Certified Mobile Web Developer and you can visit his website at: http://www.andymoore.info/.
The PHP script to detect mobile phones can be reached at http://www.andymoore.info/php-to-detect-mobile-phones/ or you can download here.
Also you can subscribe to andymores RSS feed to keep updated of changes to this script at:
http://andymoore.info/feed/