<?php

$guid = '{4BD8D571-6D19-48D3-BE97-422220080E43}';

$p = '#{?([0-9A-F]{8})-'.
	'([0-9A-F]{4})-'.
	'([0-9A-F]{4})-'.
	'([0-9A-F]{2})([0-9A-F]{2})-'.
	'([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})}?#';
preg_match($p, strtoupper($guid), $m);
echo sprintf('0x%s,0x%s%s,0x%s%s%s%s,0x%s%s%s%s', 
	$m[1], 
	$m[3], $m[2], 
	$m[7], $m[6], $m[5], $m[4], 
	$m[11], $m[10], $m[9], $m[8]);