private function db_stmt_bind_param($stmt, $params){
        $opts[] = $stmt;
        $opts['type'] = array_shift($params);
        foreach($params as $val){
            array_push($opts, $val);
        }
        return call_user_func_array('mysqli_stmt_bind_param', $opts);
    }

    public function all(){
        $this->connect();
        $stmt = $this->mysqli->stmt_init();

        /*echo $this->sql . "</br>";
        var_dump($this->bind_param);
        exit;*/

        if  (
                ($stmt->prepare($this->sql)===false) or
                ($this->db_stmt_bind_param($stmt, $this->bind_param) === FALSE) or
                ($stmt->execute() === FALSE) or
                (($result = $stmt->get_result()) === FALSE) or
                ($stmt->close() === FALSE)
            ){
            throw new \Exception(
                "SQL ERROR ({$this->mysqli->connect_errno})<br/>{$this->mysqli->connect_error}"
            );
        }
        return $this->fields = $result->fetch_assoc();
    }