吴裕雄--天生自然 PHP开发学习：表单 - 必需字段
<?php
// 定义变量并默认设为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = ""; if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["name"])) {
$nameErr = "名字是必需的。";
} else {
$name = test_input($_POST["name"]);
} if (empty($_POST["email"])) {
$emailErr = "邮箱是必需的。";
} else {
$email = test_input($_POST["email"]);
} if (empty($_POST["website"])) {
$website = "";
} else {
$website = test_input($_POST["website"]);
} if (empty($_POST["comment"])) {
$comment = "";
} else {
$comment = test_input($_POST["comment"]);
} if (empty($_POST["gender"])) {
$genderErr = "性别是必需的。";
} else {
$gender = test_input($_POST["gender"]);
}
}
?>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> <?php
// 定义变量并默认设为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = ""; if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["name"])) {
$nameErr = "名字是必须的。";
} else {
$name = test_input($_POST["name"]);
} if (empty($_POST["email"])) {
$emailErr = "邮箱是必须的。";
} else {
$email = test_input($_POST["email"]);
} if (empty($_POST["website"])) {
$website = "";
} else {
$website = test_input($_POST["website"]);
} if (empty($_POST["comment"])) {
$comment = "";
} else {
$comment = test_input($_POST["comment"]);
} if (empty($_POST["gender"])) {
$genderErr = "性别是必须的。";
} else {
$gender = test_input($_POST["gender"]);
}
} function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?> <h2>PHP 表单验证实例</h2>
<p><span class="error">* 必填字段。</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>">
名字: <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>
网址: <input type="text" name="website">
<span class="error"><?php echo $websiteErr;?></span>
<br><br>
备注: <textarea name="comment" rows="5" cols="40"></textarea>
<br><br>
性别:
<input type="radio" name="gender" value="female">女
<input type="radio" name="gender" value="male">男
<span class="error">* <?php echo $genderErr;?></span>
<br><br>
<input type="submit" name="submit" value="Submit">
</form> <?php
echo "<h2>您的输入:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?> </body>
</html>
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