<?php

//问题类
class Question implements JsonSerializable
{
    private $question_id;
    private $question_title;
    private $answer = array();
    private $right_answer;

    /**
     * Question constructor.
     * @param $question_id
     * @param $question_title
     */
    public function __construct($question_id, $question_title)
    {
        $this->question_id = $question_id;
        $this->question_title = $question_title;
    }

    /**
     * @return mixed
     */
    public function getQuestionId()
    {
        return $this->question_id;
    }

    /**
     * @return mixed
     */
    public function getQuestionTitle()
    {
        return $this->question_title;
    }

    /**
     * @param mixed $question_id
     */
    public function setQuestionId($question_id): void
    {
        $this->question_id = $question_id;
    }

    /**
     * @param mixed $question_title
     */
    public function setQuestionTitle($question_title): void
    {
        $this->question_title = $question_title;
    }

    public function jsonSerialize()
    {
        $data = [];
        foreach ($this as $key => $val) {
            if ($val !== null) $data[$key] = $val;
        }
        return $data;
    }

    /**
     * @param array $answer
     */
    public function setAnswer(array $answer): void
    {
        $this->answer = $answer;
    }

    /**
     * @param mixed $right_answer
     */
    public function setRightAnswer($right_answer): void
    {
        $this->right_answer = $right_answer;
    }


}