我已经在php中发布了在线考试。当用户开始测验时，在最后一个问题之后单击“提交”，则在该提交过程中发生了错误。但是，只有xampp中的mo localhost在提交后没有错误。 这是update.php
<?php
include_once 'dbConnection.php';
session_start();
$email=$_SESSION['email'];
//delete feedback
if(isset($_SESSION['key'])){
if(@$_GET['fdid'] && $_SESSION['key']=='najma7785068889') {
$id=@$_GET['fdid'];
$result = mysqli_query($con,"DELETE FROM feedback WHERE id='$id' ") or die('Error');
header("location:dash.php?q=3");
}
}
//restart quiz
if(@$_GET['q']== 'quizre' && @$_GET['step']== 25 ) {
$eid=@$_GET['eid'];
$n=@$_GET['n'];
$t=@$_GET['t'];
$q=mysqli_query($con,"SELECT score FROM history WHERE eid='$eid' AND email='$email'" ) or die('Error156');
while($row=mysqli_fetch_array($q) ){
$s=$row['score'];
}
$q=mysqli_query($con,"DELETE FROM `history` WHERE eid='$eid' AND email='$email' " )or die('Error184');
$q=mysqli_query($con,"SELECT * FROM rank WHERE email='$email'" )or die('Error161');
while($row=mysqli_fetch_array($q) ){
$sun=$row['score'];
}
$sun=$sun-$s;
$q=mysqli_query($con,"UPDATE `rank` SET `score`=$sun ,time=NOW() WHERE email= '$email'")or die('Error174');
header("location:account.php?q=quiz&step=2&eid=$eid&n=1&t=$t");
}
?>
以下是错误的屏幕截图：
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