public static function guid($op = false, $namespace = '')
{
$uid = uniqid("", true);
$data = $namespace;
$data .= $_SERVER['REQUEST_TIME'];
$data .= $_SERVER['HTTP_USER_AGENT'];
$data .= $_SERVER['SERVER_ADDR'];
$data .= $_SERVER['SERVER_PORT'];
$data .= $_SERVER['REMOTE_ADDR'];
$data .= $_SERVER['REMOTE_PORT'];
$hash = strtoupper(hash('ripemd128', $uid . self::$_GUID . md5($data)));
if ($op) {
self::$_GUID = substr($hash, 0, 32);
} else {
self::$_GUID = substr($hash, 0, 8) . '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
}
return self::$_GUID;
}
