验证在每个组中选择的单选按钮

Question

这是代码。 “调查”在其他地方产生。我需要验证在每组答案中单击一个单选按钮。答案和答案组的数量将是可变的。

<div id="main">
    <div class="container">
        <!-- display a table of surveys -->
        <h2><?php echo $survey['title']; ?></h2>
        <form class="survey" name="take_survey" action="./take_survey" method="post">
            <table class="table table-hover">
                <input type="hidden" name="survey" value="<?php echo $survey['id'] ?>" />
                    <tr>
                        <th>Question</th>
                        <th>Response</th>
                    </tr>
                    <?php foreach ($questions as $question) : ?>
                        <tr>
                            <td><?php echo $question['question']; ?></td>
                            <td></td>
                        </tr>
                        <?php foreach ($answers as $answer) : ?>
                            <?php if ($answer['question_id'] == $question['id']) : ?>
                            <tr>
                                <td>&nbsp;&nbsp;&nbsp;<?php echo $answer['answer']; ?></td>
                                <td><input type="radio" name="question_<?php echo $question['id']?>" value="<?php echo $answer['id'] ?>"></td>
                            </tr>
                            <?php endif; ?>
                        <?php endforeach; ?>
                    <?php endforeach; ?>
                    </tr>
            </table>
            <div class="eventButtons">
                <input class="btn btn-default" type="submit" name="submit" id="submit" value="Save">
                <input class="btn btn-default" type="reset" name="reset" id="reset" value="Clear"  class="btn">
            </div>
        </form>
    </div>
</div>