如何查看用户在测验中的选择是否正确? [英] How can I see if the user's choice in the quiz is correct?
问题描述
我正在尝试检查用户选择的答案是否正确，但无法正常工作:
I am trying to check if the answer that the user chose was correct, but it doesn't work properly:
<form method="post">
<?php
$question = mysql_query("SELECT * FROM `questions`");
$stat = mysql_fetch_assoc($question);
$num = mysql_num_rows($question);
$questionid = 0;
for($i=0;$i<=$num;$i++)
{
$question = mysql_query("SELECT * FROM `questions` WHERE `id`='$i'");
$stat = mysql_fetch_assoc($question);
//if($stat['answer'] == null
echo $stat['question'] . '<br />';
echo '<input type="radio" name="a'.$x.'" value="'.$x.'" />' .$stat['answer1']."<br />";
echo '<input type="radio" name="a'.$x.'" value="'.$x.'" />' .$stat['answer2'] . '<br />';
echo '<input type="radio" name="a'.$x.'" value="'.$x.'" />' .$stat['answer3'] . '<br />';
echo '<input type="radio" name="a'.$x.'" value="'.$x.'" />' .$stat['answer4'] . '<br />';
$questionid++;
$x = $x+1;
}
echo $result;
?>
<input type="submit" name="go" value="Go" />
</form>
那部分基本上:
$x = 1;
$question = mysql_query("SELECT * FROM `questions`");
$stat = mysql_fetch_assoc($question);
$num = mysql_num_rows($question);
if(isset($_POST['go']))
{
for($i=0;$i<$num;$i++)
{
if ($_POST['ans'.$x] == $row['correct'])
{
$result = $result + 1;
}
$x = $x + 1;
}
}
由于某种原因它没有正确发布结果，我认为代码有问题，希望得到帮助.
For some reason it doesn't post the results properly and I think something is wrong with the code, would appreciate help.
推荐答案
这是帮助您的另一种尝试.
Here's another attempt at helping you.
我实际上写了一个完整的解决方案"，在这个过程中发现了你的代码中的一些小错误 - 还有一些我无法理解的东西.
I actually wrote a "complete solution", and in the process discovered a few little bugs in your code - plus some things I just couldn't understand.
主要错误:您所有的单选按钮都具有相同的值 ($x)，因此无论您为问题 1 按下哪个按钮，答案都是1"，等等.您还做了其他一些我无法完成的事情弄清楚 - 所以我所做的是创建一个简单的流程 - 一个页面提出问题，另一个页面评估结果.
Principal bug: all your radio buttons have the same value ($x), so no matter what button you press for question 1, the answer is "1", etc. There were other things you did that I could not quite figure out - so what I did instead was create a simple flow - one page that asks the questions, and another that evaluates the results.
问题页面(我混淆了数据库的访问参数 - 不，我不使用密码"作为我的密码！):
Question page (I obfuscated access parameters for my database - no, I don't use "password" as my password!):
<html>
<body>
<form action="./evaluate.php" method="post">
<?php
$server = mysql_connect ('localhost', 'username, 'password');
mysql_select_db("questionnaire", $server);
$question = mysql_query("SELECT * FROM `Questions`;");
$x = 0;
while ($row = mysql_fetch_assoc($question))
{
echo $row['question'] . '<br />';
echo '<input type="radio" name="a'.$x.'" value=1 />' .$row['answer1'] . '<br />';
echo '<input type="radio" name="a'.$x.'" value=2 />' .$row['answer2'] . '<br />';
echo '<input type="radio" name="a'.$x.'" value=3 />' .$row['answer3'] . '<br />';
echo '<input type="radio" name="a'.$x.'" value=4 />' .$row['answer4'] . '<br />';
$x = $x + 1;
}
mysql_close($server);
?>
<input type="submit" name="Submit" value="Submit" />
<br>
</form>
</body>
</html>
和评估.php:我稍微更改了代码以使输出更清晰"，并添加红色/绿色触摸以显示已正确和错误回答的问题.显然，如果您愿意，您可以更进一步...
and evaluate.php: I changed the code a bit to make the output "cleaner", and add a red/green touch to show questions that had been answered correctly and incorrectly. Obviously you can take these things much further if you want...
<html>
<body>
<?php
$server = mysql_connect ('localhost', 'username', 'password');
mysql_select_db("questionnaire", $server);
$question = mysql_query("SELECT * FROM `Questions`;");
$x = 0;
$score = 0;
while ($row = mysql_fetch_assoc($question))
{
echo $row['question'] . '?<br />';
$answered = $row['answer'.$_POST['a'.$x]] ;
$correct = $row['correct'] ;
if ($answered == $correct ) {
$score++;
$acolor = 'green' ;
}
else {
$acolor = 'red' ;
}
echo 'you answered <font color=' . $acolor . '>' . $answered . '<font color=black> <br />';
echo 'the correct answer was ' . $correct . '<br />' ;
echo '-------------------------------------- <br />' ;
$x = $x + 1;
}
echo 'You had a total of ' . $score . ' out of ' . $x . ' questions right!';
mysql_close($server);
?>
</body>
</html>
这产生了(对于我做的一个简单的三问题多项选择)预期的结果.让我知道它是否适合您！
This produced (for a simple three-question multiple choice I made) the expected results. Let me know if it works for you!
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