Question

我已经使用启用了JavaScript的倒数计时器为考试门户网站编写了php代码。当我在本地主机中运行我的代码时。但是在服务器中，时钟会在一段时间后停止，这可能是什么问题？以下是相关代码的一部分。谢谢！！！在portal.php中

    <?php
    $_SESSION['exam_length'] = $all_questions[0]->exam_length;
    $_SESSION['start_time'] = date('Y-m-d H:i:s');
    $end_time = date('Y-m-d H:i:s',strtotime('+'.$_SESSION['exam_length'].'minutes',strtotime($_SESSION['start_time'])));
    $_SESSION['end_time'] = $end_time;
    ?>
    <div  class="col-md-3 col-lg-3 col-sm-3" id="response" style="font-size: 25px;  position: fixed; right: -7px;"></div>

    <script type="text/javascript">
    setInterval(function()
    {
        var xmlhttp = new XMLHttpRequest();
        xmlhttp.open("GET","response.php",false);
        xmlhttp.send(null);
        document.getElementById('response').innerHTML=xmlhttp.responseText;
    },1000);


    exam_length =  '<?php echo (($all_questions[0]->exam_length)*60000); ?>';
    var auto_refresh = setInterval(function() { submitform(); },exam_length);

   </script>

在response.php中：

<?php 
     session_start();
    if(($_SESSION['is_logged_in'])=="")
    {
        @header("location:../");
        exit;
    }
    $from_time1 = date('Y-m-d H:i:s');
    $to_time1 = $_SESSION['end_time'];
    $timefirst = strtotime($from_time1);
    $timesecond = strtotime($to_time1);
    $difference_second = $timesecond - $timefirst;
    echo gmdate("H:i:s",$difference_second);
    ?>

如何在PHP中启用启用了JavaScript的倒数计时器？

0 个答案: