【发布时间】：2016-01-19 22:32:03
【问题描述】：
所以对于课堂作业，我们使用 HTML 和 PHP 制作一个表单，要求用户输入两 (2) 个数字，并使用单选按钮在加法、减法、乘法或除法形式之间进行选择，然后输入猜测至于答案是什么。我们的任务是向用户回显，说明他们的答案是否正确。
我遇到麻烦的部分是“if”和“else”语句。例如，如果我选择 1 和 2 作为我的数字，猜 3 并选择加法作为我的计算方法，我不仅会得到回应“恭喜你！你选择了正确的答案 3！”但我也从除法、减法和乘法中得到我的 else 语句，指出我做错了。
这是我的代码：（请记住——生日功能尚未创建。） 此外，我在表单验证方面遇到了困难——使用户实际上输入了必填字段。
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Howdy</title>
</head>
<body>
<h1>PHP_SELF</h1>
<?php
//process the form if the submit button was pressed
if (isset($_POST['submit'])) {
//form validation goes here
/////////////////////////////////////////VARIABLES ARE BEING MADE HERE
//simplify the form variables
//later on we will do this in form validation
//create a variable called firstname and store in it
//the value from the POST array for firstname from the form
$firstname = $_POST['firstname'];
//creating variables for num1 and num2 that user inputed
$num1 = $_POST['num1'];
$num2 = $_POST['num2'];
//creating a variable called sum
//this is for when the user chooses to ADD
//num1 and num2
$sum = $num1 + $num2;
//creating a variable called difference
//this is for when the user chooses to SUBTRACT
//num1 and num2
$difference = $num1 - $num2;
//creating a variable called product
//this is for when the user chooses to MULTIPLY
//num1 and num2
$product = $num1 * $num2;
//creating a variable called quotient
//this is for when the user chooses to DIVIDE
//num1 and num2
$quotient = $num1 / $num2;
//creating a variable called guess and store it in the
//value from the POST array for the guess from the form
$guess = $_POST['guess'];
//creating a variable called birthday and store it in the
//value from the POST array for the user's birthday
$birthday = $_POST['birthday'];
if ($sum == $guess) {
echo "<p>Congratulations $firstname. You answered correctly with $guess.<p>\n";
} else if ($sum != $guess){
echo "<p>$firstname, you answered incorrectly. The correct answer is $sum.</p>\n";
}
if ($difference == $guess) {
echo "<p>Congratulations $firstname. You answered correctly with $guess.<p>\n";
} else if ($difference != $guess){
echo "<p>$firstname, you answered incorrectly. The correct answer is $difference.</p>\n";
}
if ($product == $guess) {
echo "<p>Congratulations $firstname. You answered correctly with $guess.<p>\n";
} else if ($product != $guess){
echo "<p>$firstname, you answered incorrectly. The correct answer is $product.</p>\n";
}
if ($quotient == $guess) {
echo "<p>Congratulations $firstname. You answered correctly with $guess.<p>\n";
} else if ($quotient != $guess){
echo "<p>$firstname, you answered incorrectly. The correct answer is $quotient.</p>\n";
}
} //end of the isset submit conditional statement
//show the form if it is the user's first time her OR if any of the required forms are missing
if(!isset($_POST ['submit']) OR empty($firstname) OR empty($num1) OR empty($num2)) { ?>
<h2>Please fill out the following: </h2>
<!--FORM BEGINS-->
<form action= "<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<p><label for="firstname">Please enter your first name: </label>
<input id="firstname" type="text" size="30" name="firstname" value="<?php if(isset($firstname)) echo $firstname; ?>"/><p>
<!--Challenge Dealio-->
<p><label for="Num1">Please enter a number: </label>
<input id="Num1" type="number" size="30" name="num1" value="<?php if(isset($num1)) echo $num1; ?>" /></p>
<p><label for="Num2">Please enter another number: </label>
<input id="Num2" type="number" size="30" name="num2" value="<?php if(isset($num2)) echo $num2; ?>"/><p>
<p>Please choose one of the following: </p>
<p>
<input name="add" id="answer" type="radio" value="add" />Add<br />
<input name="subtract" id="answer" type="radio" value="subtract" />Subtract<br />
<input name="multiply" id="answer" type="radio" value="multiply" />Multiply<br />
<input name="divide" id="answer" type="radio" value="divide" />Divide<br />
</p>
<p><label for="guess">Please put in a guess for the answer: </label>
<input id="guess" type="number" size="30" name="guess" value="<?php if(isset($guess)) echo $guess; ?>"/></p>
<p><label for="birthday">Please enter your birth date: </label>
<input id="birthday" type="date" size="30" name="birthday" value="<?php if(isset($birthday)) echo $birthday; ?>"/></p>
<!--Submit Button-->
<input type="submit" name="submit" value="Enter" />
</form>
<?php
} //end form conditional statement
?>
</body>
</html>
What did I do wrong? And how can I go about fixing this?
【问题讨论】：
标签： php if-statement button radio