<?php
$nameError=$emailError=$genderError=$websiteError="";
$name=$email=$gender=$comment=$website="";
function test_input($data) {
$data = trim($data);//去除用户输入数据中不必要的字符（多余的空格、制表符、换行）
$data = stripslashes($data);//删除用户输入数据中的反斜杠（\）
$data = htmlspecialchars($data);
return $data;
}
if ($_SERVER["REQUEST_METHOD"]=="POST") {
if (empty($_POST["name"])) {
$nameError="name is required";
}else{
$name=test_input($_POST["name"]);
}
if (empty($_POST["email"])) {
$emailError="email is required";
}else{
$email=test_input($_POST["email"]);
}
if (empty($_POST['gender'])) {
$genderError="gender is required";
}else{
$gender=test_input($_POST["gender"]);
}
if (empty($_POST["website"])) {
$websiteError="website is required";
}else{
$website=test_input($_POST["website"]);
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
span{
color: red;
}
</style>
</head>
<body>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<p>
Name: <input type="text" name="name">
<span>*<?php echo $nameError ?></span>
</p>
<p>
E-mail: <input type="text" name="email">
<span>*<?php echo $emailError ?></span>
</p>
<p>
Website: <input type="text" name="website">
<span>*<?php echo $websiteError ?></span>
</p>
<p>
Gender:
Female<input type="radio" name="gender" value="female">
Male<input type="radio" name="gender" value="male"><span>*<?php echo $genderError ?></span>
</p>
<p>
<input type="submit" value="提交">
</p>
<hr>
</form>
</body>
</html>
<?php
echo "姓名：".$_POST['name'];
echo "<br>";
echo "邮箱：".$_POST['email'];
echo "<br>";
echo "网址：".$_POST['website'];
echo "<br>";
echo "性别：".$_POST['gender'];
echo "<br>";
?>
