<?php
//$guid = com_create_guid(); // Only works on windows php installations
function guid(){
    if (function_exists('com_create_guid')){
        return com_create_guid();
    }else{
        mt_srand((double)microtime()*10000);
        $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;
    }
};
$guid = guid();
/*
$guid = strtolower($guid);
$guid = str_replace("-", "", $guid);
$guid = str_replace("{", "", $guid);
$guid = str_replace("}", "", $guid);
*/
?>