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我使用PHP創建了一個表單。該表格需要驗證，它適用於每個領域，但「率我們的網站」下拉菜單。我使用來自其他問題（姓名，電子郵件等）的表單中的相同代碼作爲「評價我們的網站」下拉菜單，但當用戶將其留空時，不會顯示「*必填字段」消息。當用戶將其留空時，我需要該錯誤消息與其他人一樣出現。我怎樣才能解決這個問題？這裏是我的代碼：如何在驗證PHP表單的下拉菜單中顯示「*必填字段」錯誤消息？
<!DOCTYPE HTML>
<html>
<head>
<title>Roy Feedback Form Assignment 7</title>
<style> .error {color: #FF0000;} </style>
</head>
<body>
<?php
// define variables and set to empty values
$nameErr = $emailErr = $commentErr = $likesErr = $howErr = $rateErr = "";
$name = $email = $comment = $likes = $how = $rate = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["name"])) {
$nameErr = "Name is required";
} else {
$name = test_input($_POST["name"]);
}
if (empty($_POST["email"])) {
$emailErr = "Email is required";
} else {
$email = test_input($_POST["email"]);
}
if (empty($_POST["comment"])) {
$commentErr = "Comments are required";
} else {
$comment = test_input($_POST["comment"]);
}
if (empty($_POST["likes"])) {
$likesErr = "Things you liked is required";
} else {
$likes = test_input($_POST["likes"]);
}
if (empty($_POST["how"])) {
$howErr = "How you got to our site is required";
} else {
$how = test_input($_POST["how"]);
}
if (empty($_POST["rate"])) {
$rateErr = "Rating our site is required";
} else {
$rate = test_input($_POST["rate"]);
}
}
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
<h2>Roy Feedback Form Assignment 7</h2>
<p><span class="error">* required field.</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
Name: <input type="text" name="name">
<span class="error">* <?php echo $nameErr;?></span>
<br><br>
E-mail: <input type="text" name="email">
<span class="error">* <?php echo $emailErr;?></span>
<br><br>
Comment: <textarea name="comment" rows="5" cols="40"></textarea>
<span class="error">* <?php echo $commentErr;?></span>
<br><br>
Things you liked:
<input type="radio" name="likes" value="Site design">Site design
<input type="radio" name="likes" value="Links">Links
<input type="radio" name="likes" value="Ease of use">Ease of use
<input type="radio" name="likes" value="Images">Images
<input type="radio" name="likes" value="Source code">Source code
<span class="error">* <?php echo $likesErr;?></span>
<br><br>
How you got to our site:
<input type="radio" name="how" value="Search engine">Search engine
<input type="radio" name="how" value="Links from another site">Links from another site
<input type="radio" name="how" value="Deitel.com website">Deitel.com website
<input type="radio" name="how" value="Reference from a book">Reference from a book
<input type="radio" name="how" value="Other">Other
<span class="error">* <?php echo $howErr;?></span>
<br><br>
Rate our site:
<select name="rate">
<option value="">- Please Select -</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<span class="error">* <?php echo $rateErr;?></span>
</select>
<br/><br/>
<input type="submit" name="submit" value="Submit">
</form>
<?php
echo "<h2>Your Input:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $comment;
echo "<br>";
echo $likes;
echo "<br>";
echo $how;
echo "<br>";
echo $rate;
?>
</body>
</html>
非常感謝大家的幫助！非常感謝。