Question

我想在PHP中进行测验。答案从单选按钮中选择。如果用户选择正确答案，则如果错误答案他的分数减1，则他的分数加1。最后，我希望他的分数显示为警报。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Quiz</title>
</head>

<body>

<?php

$score=0; 

?>

<p><font size="3"> <b>There is 2 multiple choice questions<br />
Every correct answer +1 <br />
Wrong answer -1<br />
Good Luck!</b></font></p></br></br></br>

<table width="300" border="1" cellspacing="2" cellpadding="2">
  <tr>
    <td><p><font size="3"> <b> Question 1:
</b></font></p>
Guess The Star Of The Movie  <font color="red">"The Equalizer"</font><br />
<br />



<input type="radio" name="n1" value="Denzel Washington">Denzel Washington<br>
<input type="radio" name="n1" value="Mark Wahlberg">Mark Wahlberg<br>
<input type="radio" name="n1" value="Jason Statham">Jason Statham<br>
<input type="radio" name="n1" value="Sylvester Stallone">Sylvester Stallone<br>

</form ></td>
  </tr>

  <tr>
    <td><p><font size="3"> <b> Question 2:
</b></font></p>
Guess The Star Of The Movie  <font color="red">"Game Plan"</font><br />
<br />


<input type="radio" name="n2" value="Vin Diesel">Vin Diesel<br>
<input type="radio" name="n2" value="Dwayne Johnson">Dwayne Johnson<br>
<input type="radio" name="n2" value="Liam Hamworth">Liam Hamworth<br>
<input type="radio" name="n2" value="Adam Sandler">Adam Sandler<br>

</form ></td>
  </tr>

</table>

<?php
$score=0; 

if($n1=="Denzel Washington")
$score = $score+1;
else $score = $score-1;
if($n2=="Dwayne Johnson")
$score = $score+1;
else
$score = $score-1;
?>
<button type="button"  onclick="alert('<?php echo "your score is: ".$score."";  ?> ')">Submit</button>
</body>
</html>

当我点击提交按钮时，分数为-2，尽管我选择了正确的答案

Answer 1

您的代码无条件运行，无论何时加载页面。这意味着你的答案是正确的＃34;代码总是声明错误。你有效地得到了：

$score = 0;
$score = $score - 1; // $n1 is blank, therefore wrong
$score = $score - 1; // $n2 is blank, therefore wrong

您应该至少检测表单是否实际提交，例如

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    ... do scoring here ..
}

但大多数情况无关紧要。您甚至没有<form>标记，因此这些输入字段无法提交任何内容。

没有数据库的PHP评分系统

1 个答案: