PHP学习笔记 12

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PHP 表单

表单数据被存放在 $_GET 和 $_POST 中
$_SERVER["REQUEST_METHOD]" 返回表单的 method 属性值
htmlspecialchars() 将特殊字符转化为 HTML 表示

示例

登录页面

<?php session_start(); ?><!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <meta name="viewport" content="width=device-width, initial-scale=1.0">    <meta http-equiv="X-UA-Compatible" content="ie=edge">    <title>登录</title>    <script>        function validate_form(form) {            with (form) {                if (userName.value == null || userName.value.trim() == "") {                    alert("用户名不能为空！");                    return false;                }                if (captcha.value == null || captcha.value.trim() == "") {                    alert("验证码不能为空！");                    return false;                }            }            return true;        }    </script></head><body>    <form method="post" action="welcome.php" onsubmit="return validate_form(this)">        姓名：<input type="text" name="userName" value=""> <br>        验证码：<input type="text" name="captcha" value="" size=10>        <img title="点击刷新" id="captchaImg" border="1" src="../captcha/captchaImage.php"            onclick="this.src='../captcha/captchaImage.php?r=' + Math.random();"></img><br>        <input type="submit"/>    </form></body></html>

欢迎页面

<?php session_start(); ?><!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <meta name="viewport" content="width=device-width, initial-scale=1.0">    <meta http-equiv="X-UA-Compatible" content="ie=edge">    <title>欢迎</title></head><body>    <?php    function testInput($data) {        $data = trim($data);        $data = stripslashes($data);        $data = htmlspecialchars($data);        return $data;    }    if ($_SERVER["REQUEST_METHOD"] == "POST") {        if (empty($_POST['captcha'])) {            echo "请输入验证码！";        } else {            $captcha = testInput($_POST['captcha']);            if (strcasecmp($captcha, $_SESSION['captcha']) == 0) {                if (empty($_POST["userName"])) {                    echo "用户名不能为空！";                } else {                    $userName = testInput($_POST["userName"]);                    echo "欢迎，" . $userName . "！";                }            } else {                echo "验证码错误!请重新<a href='./form.php'>登录</a>";            }        }    }    ?></body></html>

查看运行结果

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