PHP 表单验证实例 - 自学教程(runoops.com)

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>PHP 表单验证 实例 - 自学教程(runoops.com)</title>
</head>

<body>

<?php
    // 定义变量并默认设置为空值
    $name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
        $name = test_input($_POST["name"]);
        $email = test_input($_POST["email"]);
        $website = test_input($_POST["website"]);
        $comment = test_input($_POST["comment"]);
        $gender = test_input($_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>
    <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
        名字: <input type="text" name="name">
        <br><br>
        E-mail: <input type="text" name="email">
        <br><br>
        网址: <input type="text" name="website">
        <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
        <br><br>
        <input type="submit" name="submit" value="Submit">
    </form>

<?php
    echo "<h2>您输入的内容是:</h2>";
    echo $name;
    echo "<br>";
    echo $email;
    echo "<br>";
    echo $website;
    echo "<br>";
    echo $comment;
    echo "<br>";
    echo $gender;
    ?>

</body>