我想做一个测试插件。使用自定义的post类型，我制作了一个元框，其中包含以下表单。

<table class="form-table">
        <tbody>
            <tr>
                <th>
                    <label for="quiz_type">Quiz Type</label>
                </th>
                <td>
                    <select name="quiz_data[quiz_type]" id="quiz_type">
                        <option value="trivia">Trivia</option>
                        <option selected="selected" value="personality">Personality</option>
                    </select>
                    <br>
                    <span class="description">Choose the type of quiz.</span>
                </td>
            </tr>
            <tr>
                <th>
                    <label for="quiz_data[questions][1][question]">Question</label>
                </th>
                <td>
                    <input type="text" name="quiz_data[questions][1][question]" id="quiz_data[questions][1][question]" value="fffffff"
                        size="75">
                    <br>
                    <span class="description">What is the question.</span>
                </td>
            </tr>
            <tr>
                <th>
                    <label for="quiz_data[questions][1][answers][1][answer]">Answer</label>
                </th>
                <td>
                    <input type="text" name="quiz_data[questions][1][answers][1][answer]" id="quiz_data[questions][1][answers][1][answer]"
                        value="dfdfds" size="30">
                </td>
                <th>
                    <label for="quiz_data[questions][1][answers][1][is_correct]">Is Correct?</label>
                </th>
                <td>
                    <input type="checkbox" name="quiz_data[questions][1][answers][1][is_correct]" id="quiz_data[questions][1][answers][1][is_correct]">
                </td>
            </tr>
            <tr>
                <th></th>
                <td>
                    <button class="add-answer button-secondary" id="add_new_answer" name="add_new_answer" type="submit" formmethod="post"
                        value="quiz_data[questions][1][answers][2][answer]">Add Answer</button>
                </td>
            </tr>
            <tr>
                <th></th>
                <td>
                    <button class="add-question button-primary" name="add_new_question" type="submit" value="">Add Question</button>
                </td>
            </tr>
        </tbody>
    </table>

输入保存为post元数据的数组。我可以在按下任何按钮时成功保存文本输入，并且在加载编辑器时调用这些值。我遇到的问题是，当按下相应的按钮时，添加一个没有javascript的新输入字段。

我原以为，使用上述标记，当我单击“添加答案”按钮时，会设置$\\u POST[\'add\\u new\\u answer]，但事实并非如此。

使用PHP单击该按钮时，如何获取其值？

以下是我目前正在尝试的：

if ( isset( $_POST[\'quiz_data\'] ) || isset( $_POST[\'add_new_answer\'] )  || isset($_POST[\'add_new_question\'] ) ) {

            if ( isset( $_POST[\'quiz_data\'] ) ){
                $updated_quiz_data = $_POST[\'quiz_data\'];
            }

            if ( isset( $_POST[\'add_new_answer\'] ) ){
                $updated_quiz_data = array_merge( $updated_quiz_data, $_POST[\'add_new_answer\'] );
            }

            if ( isset( $_POST[\'add-new-question\'] ) ){
                $updated_quiz_data = array_merge( $updated_quiz_data, $_POST[\'add-new-answer\'] );
            }

            // Update the post meta data with the updated quiz
            update_post_meta( $quiz_id, \'quiz_data\', $updated_quiz_data );
        }