问如何将所有复选框的值存储到一个数组中，并使用AJAX调用将其传递给PHP函数？

EN

<div class="modal fade test-modal" id="Test">
    <div class="modal-dialog">
        <div class="modal-content">
            <? foreach ($questions as $i=>$question) { ?>
            <div class='question'>
                <div class="modal-header">
                    <div class="row">
                        <h4>QUIZ</h4>
                    </div>
                </div>
                <div class="modal-body">
                    <div class="row">
                        <div class="quest">
                            <ul class="list-unstyled">
                                <? foreach ($question->getAnsChoice as $answer) { ?>
                                    <li>
                                        <div class="checkbox">
                                                <input class="cb" type="checkbox" name="answer[]" value="<?=$answer->title?>">
                                                <?=$answer->title?> 
                                        </div>
                                    </li>
                                <? } ?> 
                            </ul>
                            <br>
                            <br>
                            <p class='error'>Please select an answer</p>
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <p class='quest_num'><?=$question->number?> of <?=count($questions)?></p>
                    <?  if( count($questions) === 1 ) { ?>
                        <a id="submit_quiz" class="btn button btn-lg quiz-btn">Submit Test</a>
                    <? } else if ( count($questions) === $i +1 ) { ?>
                        <a id="submit_quiz" class="btn button btn-lg quiz-btn">Submit Test</a>
                    <? }  else { ?>
                        <a class=" btn button btn-lg quiz-btn">Next Question</a>
                    <? } ?>
                </div>
            </div>
            <? } ?>
        </div>
    </div>
</div>

<script type="text/javascript">
    $(document).on('ready', function(){
        $('.quiz-btn').click(function(e){
            e.preventDefault()
            var checkbox = $(this).parents('.question').children('.modal-body').children('.row').children('.quest').children('ul').children('li').children('.checkbox').children('.icheckbox_square');
            var btn = $(this).parents('.question').children('.modal-footer').children('.quiz-btn')
            var next = false
            var submit = false
            var answers = [];
            $(checkbox).each(function(){
                if ( $(this).hasClass('checked') && $(btn).html() == 'Next Question' ) {
                    answers.push($('.cb:checked').val());
                    next = true
                } 
                else if ($(this).hasClass('checked') && $(btn).html() == 'Submit Test') {
                    submit = true
                }
            });

            if ( next ) {
                e.preventDefault();
                $(this).parents('.question').slideUp(500);
                $(this).parents('.question').next('.question').delay(500).slideDown(500);
            } else if ( submit ) {
                e.preventDefault();
                $.post('/student/submit_quiz',{asnwers: answers}, function(data){

                });
            } else {
                console.log(next)
                $('.quest .error').fadeIn();
            }
        });
    }
</script>