测验中的 PHP 复选框，人们必须选择多个正确答案才能获得一分

Question

我目前正在使用 html 和 PHP 进行测验，我想在有多个正确答案的情况下使用复选框。用户必须得到所有正确答案才能获得每题一分。我一直在看很多教程，但似乎没有什么能完全满足我的需求。任何帮助将不胜感激！

这是其中一个问题的示例，如果您能告诉我需要添加什么：

<p class="question">2. Which clubs did Arsene Wenger manage before taking the arsenal job in 1996?</p>
<ul class="answers">
    <input type="checkbox" name="q2[]" id="q2a" value="q2a"><label for="q2a" class="labela">Monaco</label><br/>
    <input type="checkbox" name="q2[]" id="q2b" value="q2b"><label for="q2b" class="labelb">Paris Saint-Germain</label><br/>
    <input type="checkbox" name="q2[]" id="q2c" value="q2c"><label for="q2c" class="labelc">Bayern Munich</label><br/>
    <input type="checkbox" name="q2[]" id="q2d" value="q2d"><label for="q2d" class="labeld">Nagoya Grampus</label><br/>
</ul>

在一个单独的答案页面上我现在拥有什么：

<?php
$q2 = $_POST['q2'];

    $total = 0;

    if ($q2 == "a") { $total = $total + 0.5; }
    if ($q2 == "b") { $total = $total + 0; }
    if ($q2 == "c") { $total = $total + 0; }
    if ($q2 == "d") { $total = $total + 0.5; }
?>

Answer 1

您可以执行类似于以下的操作：

<?php
//This should contain four array elements 0-3
$q2 = $_POST['q2'];

$total = 0;

foreach($q2 as $key=>$a2)
{
   //Check if this is the first or fourth checkbox and that it is ticked
   if(($key == 0 && $a2) || ($key == 3 && $a2)
   { 
      //We have checkbox 1 or 4 and they have been checked
      $total = $total + 0.5;
   }
}
?>

唯一的问题是，您必须遍历每个问题并每次更改循环，以便您只选择正确的答案。即下面的行：

 if(($key == 0 && $a2) || ($key == 3 && $a2)

对于问题三，正确的答案可能是复选框 1 和 2，因此脚本开始看起来像这样

<?php
$q2 = $_POST['q2'];
$q3 = $_POST['q3'];

$total = 0;

foreach($q2 as $key=>$a2)
{
   //Check if this is the first or fourth checkbox and that it is ticked
   if(($key == 0 && $a) || ($key == 3 && $a)
   { 
      //We have checkbox 1 or 4 and they have been checked
      $total = $total + 0.5;
   }
}

foreach($q3 as $key=>$a3)
{
   //Check if this is the first or second checkbox and that it is ticked
   if(($key == 0 && $a3) || ($key == 1 && $a3)
   { 
      //We have checkbox 1 or 2 and they have been checked
      $total = $total + 0.5;
   }
}
?>

这意味着如果是 20 个问题的测验，您还有一些工作要做。另请注意，如果他们选中不是正确答案的框，他们将不会失去任何分数。因此，如果我勾选页面上的每个复选框，我将获得 100% 的分数，即使我可能选中了一个错误答案的框，要解决这个问题，如果选中了错误的框，你可以减去，如下所示：

foreach($q3 as $key=>$a3)
{
   //Check if this is the first or second checkbox and that it is ticked
   if(($key == 0 && $a3) || ($key == 3 && $a3)
   { 
      //We have checkbox 1 or 2 and they have been checked
      $total = $total + 0.5;
   }
   else
  {
     $total = $total - 0.5;
  }
}

Answer 2

如果元素名称中包含[]，即为数组，则必须检查值是否在数组中in_array()

if (in_array("a",$q2)) { $total = $total + 0.5; }