Question

我正在使用php和mysql作为数据库创建一个考试页面。我通过while循环显示问题和选项。

我面临的问题是从用户那里获取所选的值。

任何帮助将不胜感激！

以下是代码：

<body>
<form name="form1" method="POST" action="">
<input name="submit" type="submit" value="Start Test">

<?php
$username="root";
$password="";
$database="assesment";
mysql_connect("localhost",$username,$password);
    @mysql_select_db($database) or die( "Unable to select database");

    if(isset($_POST['submit']))
{   
    $query = "SELECT * FROM demo";
    $result = mysql_query($query);
    $num = mysql_num_rows($result);
    mysql_close();
    echo "<b><center>Database Output</center></b><br><br>";
    $i=0;while ($i < $num)
    {
        $qno = mysql_result($result,$i,"qno");
        $quest = mysql_result($result,$i,"quest");
        $a = mysql_result($result,$i,"a");
        $b = mysql_result($result,$i,"b");
        $c = mysql_result($result,$i,"c");
        $d = mysql_result($result,$i,"d");
        echo "
        <br><br><b> $qno.&nbsp;&nbsp;$quest<br><br> 
        Options : </b>
        <input type='Radio' Name='Answer $qno' value='A'  >A.<span><span> $a &nbsp;&nbsp;
        <input type='Radio' Name='Answer $qno' value='B'  >B.<span><span> $b &nbsp;&nbsp;
        <input type='Radio' Name='Answer $qno' value='C'  >C.<span><span> $c &nbsp;&nbsp;
        <input type='Radio' Name='Answer $qno' value='D'  >D.<span><span> $d &nbsp;&nbsp; 
        <br><br>";
        $i++;
    }
}

Answer 1

首先，不推荐使用mysql_*函数，不应使用它。使用MySQLi或PDO。用MySQLi发布我的答案。

我会改为另一个while循环：

<body>
<form name="form1" method="POST" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<?php

if(isset($_POST['submit']) && $_POST['submit'] == "Start Test"){   
    $username="root";
    $password="";
    $database="assesment";
    $sql = mysqli_connect("localhost", $username, $password, $database);
    if (mysqli_connect_errno()) {
      printf("Connect failed: %s\n", mysqli_connect_error());
      exit();
    }
    $query = "SELECT * FROM demo";
    $result = mysqli_query($sql, $query);
    $num = mysqli_num_rows($result);

    echo "<b><center>Database Output</center></b><br><br>";

    while ($row = mysqli_fetch_assoc($result)) {
        $qno = $row['qno'];
        $quest = $row['quest'];
        $a = $row['a'];
        $b = $row['b'];
        $c = $row['c'];
        $d = $row['d'];
        echo "<br><br><b> $qno.&nbsp;&nbsp;$quest<br><br>\r\n"
        echo "Options : </b>\r\n";
        echo "<input type='Radio' Name='Answer[$qno]' value='A'  >A.<span><span> $a &nbsp;&nbsp;\r\n";
        echo "<input type='Radio' Name='Answer[$qno]' value='B'  >B.<span><span> $b &nbsp;&nbsp;\r\n";
        echo "<input type='Radio' Name='Answer[$qno]' value='C'  >C.<span><span> $c &nbsp;&nbsp;\r\n";
        echo "<input type='Radio' Name='Answer[$qno]' value='D'  >D.<span><span> $d &nbsp;&nbsp;\r\n"
        echo "<br><br>";
    }

    mysqli_free_result($result);
    echo "<input name='submit' type='submit' value='See Results'>\r\n";
    mysqli_close($sql);

} elseif(isset($_POST['submit']) && $_POST['submit'] == "See Results") {
   // Review answers and show the correct ones
   foreach($_POST['Answer'] as $answer){
      // Iterate over answers...
   }
} else {
   echo "<input name='submit' type='submit' value='Start Test'>\r\n";
}
?>
</form>
</body>

您可能还想考虑将提交按钮移到最后，但只要所有内容都包含在<form>标记内，它就应该提交整个表单。

关于答案，这取决于您存储它们的位置。但是如果你把它们放到一个类似的数组中，你可以循环它并比较结果。例如：

} elseif(isset($_POST['submit']) && $_POST['submit'] == "See Results") {
   // Review answers and show the correct ones
   $userAnswers = $_POST['Answer'];
   // Connect to DB and get Answer Key code... put in array called $keyAnswers
   $resultAnswers = array();
   for($i=0;$i<count($keyAnswers);$i++){
     if(isset($userAnswers[$i])){
       // Compare if user answered the question
       $resultAnswers[$i] = ($userAnswers[$i] == $keyAnswers[$i])?TRUE:FALSE;
     } else {
       // Answer is wrong if they did not answer it
       $resultAnswers[$i] = FALSE;
     }
   }
   foreach($resultAnswers as $k => $v){
     if($v){
       echo "You answered Question $k correctly.<br />\r\n";
     } else {
       echo "You answered Question $k incorrectly.<br />\r\n";
     }
   }
}

比较通过while循环动态生成的单选按钮的选定值并显示分数

1 个答案: