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Generate Globally Unique IDs (GUIDs) in PHP

Wed, 13/04/2011 - 20:36 — horuskol

PHP function to generate a Version 4 GUID based on IETF RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace

function generateGUID()
{
	$guid = '';
 
	$time_low = str_pad(dechex(mt_rand(0, 65535)), 4, '0', STR_PAD_LEFT) . str_pad(dechex(mt_rand(0, 65535)), 4, '0', STR_PAD_LEFT);
	$time_mid = str_pad(dechex(mt_rand(0, 65535)), 4, '0', STR_PAD_LEFT);
 
	$time_high_and_version = mt_rand(0, 255);
	$time_high_and_version = $time_high_and_version & hexdec('0f');