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Html + PHP 表单验证
hanyufeng的博客
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说明：

提交Html页面表单到PHP页面验证，通过转到success页面，未通过返回表单继续修改。

运行效果：

L22.png

示例源码：

Html页面（lesson22_demo5.html）：

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="http://demo.h-ui.net/H-ui.admin/3.1/static/h-ui/css/H-ui.min.css">
    <title>php处理表单</title>
</head>
<body>
<div class="containBox">
    <div class="containBox-bg"></div>
    <div class="wap-container">
        <div class="container ui-sortable">
            <div class="panel-body" style="display: block;">
                <form action="check.php" method="post" class="form form-horizontal responsive">
                    <div class="panel panel-default mt-20"  style="width:800px;margin:0 auto">
                        <div class="panel-header selected">注册</div>
                        <div class="row cl">
                            <label class="form-label col-sm-2 col-md-2 col-md-offset-2">用户名:</label>
                            <div class="formControls col-sm-5 col-md-5">
                                <input type="text" name="username" class="input-text">
                            </div>
                        </div>
                        <div class="row cl">
                            <label class="form-label col-sm-2 col-md-2 col-md-offset-2">邮箱:</label>
                            <div class="formControls col-sm-5 col-md-5">
                                <input type="text" name="email" class="input-text">
                            </div>
                        </div>
                        <div class="row cl">
                            <label class="form-label col-sm-2 col-md-2 col-md-offset-2">性别:</label>
                            <div class="formControls skin-minimal col-xs-5">
                                <input type="radio" id="gender" name="gender" value="男" checked="true">
                                <label for="gender">男</label>
                                <input type="radio" id="gender" name="gender" value="女">
                                <label for="gender">女</label>
                                <input type="radio" id="gender" name="gender" value="保密">
                                <label for="gender">保密</label>
                            </div>
                        </div>
                        <div class="row cl">
                            <label class="form-label col-sm-2 col-md-2 col-md-offset-2">年龄:</label>
                            <div class="formControls col-sm-5 col-md-5">
                                <select name="age" class="select valid">
                                    <option value="1">30以内</option>
                                    <option value="2">30到50</option>
                                    <option value="3">50岁以上</option>
                                </select>
                            </div>
                        </div>
                        <div class="row cl">
                            <label class="form-label col-sm-2 col-md-2 col-md-offset-2">备注:</label>
                            <div class="formControls col-sm-5 col-md-5">
                                <textarea name="memo" id="" cols="30" rows="10" class="textarea valid"></textarea>
                            </div>
                        </div>
                        <div class="row cl">
                            <div class="formControls col-md-5 col-md-offset-4">
                                <button class="add btn btn-primary size-L">提交</button>
                            </div>
                        </div>
                    </div>
                </form>                
            </div>
        </div>
    </div>
</div>
</body>
</html>

PHP页面（check.php）：

<?php
//验证用户名
//用isset()检测是否存在且不为null
$username = isset($_REQUEST['username']) ? $_REQUEST['username'] : null;
if (empty($username)) { //确认不是空字符串
    echo '<script>alert("您没有输入用户名~~")</script>';
} else {
    echo '<script>alert("您的用户名是:'.$username.'")</script>';
}
//验证邮箱
$email = isset($_REQUEST['email']) ? $_REQUEST['email'] : null;
if (empty($email)) {  //确认不是空字符串
    echo '<script>alert("您没有输入邮箱~~")</script>';
} else {
    echo '<script>alert("您的邮箱是:'.$email.'")</script>';
}

//验证性别
$gender = isset($_REQUEST['gender']) ? $_REQUEST['gender'] : null;
if (is_null($gender)) {//如果用户没有选择，会返回null。可以先在页面上设置默认值。
    echo '<script>alert("您没有选择性别~~")</script>';
} else {
    echo '<script>alert("您的性别是:'.$gender.'")</script>';
}

//验证年龄
$age= isset($_REQUEST['age']) ? $_REQUEST['age'] : null;
switch ($age)
{
    case '1':
        echo  '您的年龄是:30以内';
        break;
    case '2':
        echo  '您的年龄是：30-50';
        break;
    case '3':
        echo  '您的年龄是：50以上';
        break;
    default:
        ;
}


//验证备注
$memo= isset($_REQUEST['memo']) ? $_REQUEST['memo'] : null;
if (is_null($memo)) {
    echo '<script>alert("您没有填写备注~~")</script>';
} else {
    echo '<script>alert("您的备注是:'.$memo.'")</script>';
}

if ($username && $email &$gender && $age && $memo) {
    echo '<script>alert("验证通过~~");location.href="success.php";</script>';
} else {
    echo '<script>alert("验证失败,请检查~~")
    location.href=history.go(-1)</script>';
//    使用后退，而不是跳转，可以保留之前输入的内容
}


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