我想编写一个显示随机图像的PHP代码,并且该人必须猜测它是什么。问题是我的PHP代码告诉我正确的城市是不正确的,我无法弄清楚为什么
<?php
$random = rand(1, 3);
$answer ;
if ($random == 1) { $answer = "chicago" ;}
elseif($random == 2) {$answer = "LA" ;}
elseif($random == 3) {$answer = "NewYork" ;}
else {echo "Answer is None" ; }
if (isset($_POST["choice"])) {
$a = $_POST["choice"];
if($a ==$answer){
echo "<br> working <br>" ;
}else {echo "<br> Not Working <br>";}
}
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>City Guess</title>
</head>
<body>
<center>
<img src="four/Image_<?php echo $random ;?>.jpg" width="960" height="639" alt=""/>
<form action="" method="POST">
chicago <input type= "radio" name="choice" value="chicago" />
<br>
LA <input type= "radio" name="choice" value="LA" />
<br>
NewYork <input type= "radio" name="choice" value="NewYork" />
<br>
<input type ="submit" value="Submit" />
</form>
</center>
</body>
</html>
答案 0 :(得分:2)
您正在生成随机值 EVERYTIME 页面已加载。例如当此人首次访问并获取表单时,您会生成2
。提交表单后,您会生成另一个值,这次它是3
。因此,即使用户正确回答2
,您也会说他们错了,因为您已经忘记了原来的问题。
您需要以某种方式存储生成的值,并将其与响应进行比较,例如
$rand = rand(1,3);
<input type="hidden" name="correct_answer" value="$rand">
if ($_SERVER["REQUEST_METHOD"] == 'POST') {
if ($_POST['correct_answer'] == $_POST['user_answer']) {
echo 'correct';
}
}
答案 1 :(得分:1)
问题在于您的逻辑,您不存储用于显示图像的生成数字,而是每次打开页面时生成新数字。
您应该将生成的数字存储在(例如......)会话中以保留它并使用它进行比较。
答案 2 :(得分:0)
试一试:
$random = floor(rand(1, 4));
我希望它有所帮助。
答案 3 :(得分:0)
使用value="<?php echo $answer ?>"
在表单中添加以下隐藏字段,它将与您现有的代码一起使用。
<input type="hidden" name="correct_answer" value="<?php echo $answer ?>">
事实上,你甚至不需要name="correct_answer"
只是做:
<input type="hidden" value="<?php echo $answer ?>">
请记住,当您对此进行测试时,您有“1/3”成功的机会!
以下是我使用的代码:
<?php
$random = rand(1, 3);
$answer;
if ($random == 1) { $answer = "chicago" ;}
elseif($random == 2) {$answer = "LA" ;}
elseif($random == 3) {$answer = "NewYork" ;}
else {echo "Answer is None" ; }
if (isset($_POST["choice"])) {
$a = $_POST["choice"];
if($a ==$answer){
echo "<br> working <br>" ;
}else {echo "<br> Not Working <br>";}
}
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>City Guess</title>
</head>
<body>
<center>
<img src="four/Image_<?php echo $random ;?>.jpg" width="960" height="639" alt=""/>
<form action="" method="POST">
<input type="hidden" value="<?php echo $answer ?>">
chicago <input type= "radio" name="choice" value="chicago" />
<br>
LA <input type= "radio" name="choice" value="LA" />
<br>
NewYork <input type= "radio" name="choice" value="NewYork" />
<br>
<input type ="submit" value="Submit" />
</form>
</center>
</body>
</html>