php uuid

function uuid($prefix = ''){
        $str = uniqid('',true);
        $arr = explode('.',$str);
        $str = $prefix.base_convert($arr[0],16,36).base_convert($arr[1],10,36).base_convert(bin2hex(random_bytes(5)),16,36);
        $len = 24;
        $str = substr($str,0,$len);
        if(strlen($str) < $len){
            $mt = base_convert(bin2hex(random_bytes(5)),16,36);
            $str = $str.substr($mt,0,$len - strlen($str));
        }
        return $str;
    }
// return 6x84e9pbro319qu68b9alda6