<?php
// 如果是有POST请求才执行这些
if ($_SERVER["REQUEST_METHOD"] == "POST") {
// 存储每个字段的错误信息
$nameErr = $emailErr = $genderErr = $websiteErr = "";
// 存储每个字段的信息
$name = $email = $gender = $comment = $website = "";
// 对每个字段进行判断
if (empty($_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["website"])) {
$website = "";
} else {
$website = test_input($_POST["website"]);
}
if (empty($_POST["comment"])) {
$comment = "";
} else {
$comment = test_input($_POST["comment"]);
}
if (empty($_POST["gender"])) {
$genderErr = "Gender is required";
} else {
$gender = test_input($_POST["gender"]);
}
}
// 用来把要输出到页面上的东西全部变成直接输出的，没有意义的
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
<html>
<head>
<style>
.error{
color:red;
}
</style>
</head>
<body>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="POST">
Name:<input type="text" name="name"><span class="error">* <?php echo $nameErr;?></span><br>
E-mail:<input type="text" name="email"><span class="error">* <?php echo $emailErr;?></span><br>
Website:<input type="text" name="website"><span class="error"><?php echo $websiteErr;?></span><br>
Comment:<textarea name="comment" rows="5" cols="40"></textarea><br>
Gender:
<input type="radio" name="gender" value="female">Famale
<input type="radio" name="gender" value="male">Male<span class="error">* <?php echo $genderErr;?></span><br>
<input type="submit">
</form>
<h1>Your Input:</h1>
<?php
echo test_input($name);
echo test_input($email);
echo test_input($website);
echo test_input($comment);
echo test_input($gender);
?>
</body>
</html>
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