PHP GUID / UUID

Posted 2021-05-14

/**
 * Defines the guid function
 *
 * @category functions
 * @package  skeleton
 * @author   Rob Brown <[e-mail]>
 * @license  http://www.gnu.org/philosophy/free-sw.html GPL Free
 * @link     http://www.itsgotto.be/cv.php
 */

/**
 * Generate a uuid
 *
 * Generate a UUID taken from a web page that said this was the way to do it.
 *
 *
 * @return string A uuid
 */
function guid() {
	if (function_exists('com_create_guid')) {
		return trim(com_create_guid(), '{}');
	} else {
		mt_srand((double) microtime() * 10000); //optional for php 4.2.0 and up.
		$charid = strtoupper(md5(uniqid(rand(), true)));
		$hyphen = chr(45); // "-"
		$uuid = ''//chr(123)// "{"
		 . substr($charid, 0, 8) . $hyphen
		. substr($charid, 8, 4) . $hyphen
		. substr($charid, 12, 4) . $hyphen
		. substr($charid, 16, 4) . $hyphen
		. substr($charid, 20, 12)
		. ''; //chr(125);// "}"
		return $uuid;
	}
}