function getUuid($separator = '-'){$str = md5(uniqid(mt_rand(100, 1000000), true));$uuid = substr($str, 0, 8).$separator;$uuid .= substr($str, 8, 4).$separator;$uuid .= substr($str, 12, 4).$separator;$uuid .= substr($str, 16, 4).$separator;$uuid .= substr($str, 20, 12);return $uuid;}