A method for creating GUIDs for PHP, even if com_create_guid() isn't available.

getNewGUID.php

    private function getNewGUID($wrapWithBraces = false) {
        if (function_exists('com_create_guid')) {
            return com_create_guid();
        } else {
            mt_srand((double)microtime() * 10000); //optional for php 4.2.0 and up.
            $charid = strtoupper(md5(uniqid(rand(), true)));
            $uuid = ($wrapWithBraces ? '{' : '')
                . substr($charid, 0, 8) . '-'
                . substr($charid, 8, 4) . '-'
                . substr($charid, 12, 4) . '-'
                . substr($charid, 16, 4) . '-'
                . substr($charid, 20, 12)
                . ($wrapWithBraces ? '}' : '');
            return $uuid;
        }
    }