Collection
Collection
先上待验证表单
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>PHP处理表单</title> </head> <body> <form action="check.php" method="post"> <fieldset> <legend>注册</legend> <p><label>用户:<input type="text" name="name"></label></p> <p><label>邮箱:<input type="text" name="email"></label></p> <p>性别： <label><input type="radio" name="gender" value="male">男</label> <label><input type="radio" name="gender" value="female">女</label> </p> <p> <label> 年龄： <select name="age" id=""> <option value="1">30以下</option> <option value="2">30以上</option> </select> </label> </p> <p> 备注： <textarea name="comments" id="" cols="30" rows="10"></textarea> </p> </fieldset> <input type="submit"> </form> </body> </html>
然后送上验证代码
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
<?php
header('Content-type:text/html;charset=utf-8');
$name = isset($_REQUEST['name']) ? $_REQUEST['name'] : null;
if (empty($name)) {
echo '<script>alert("请输入用户名");window.history.go(-1)</script>';
} else {
echo '<script>alert("您的用户名是' . $name . '")</script>';
}
$email = isset($_REQUEST['email']) ? $_REQUEST['email'] : null;
if (empty($email)) {
echo '<script>alert("请输入邮箱");window.history.go(-1)</script>';
} else {
echo '<script>alert("您的邮箱是' . $email . '")</script>';
}
$gender = isset($_REQUEST['gender']) ? $_REQUEST['gender'] : null;
switch ($gender) {
case 'male':
echo "<script>alert('公的')</script>";
break;
case 'female':
echo '<script>alert("公的")</script>';
break;
}
$age = isset($_REQUEST['age']) ? $_REQUEST['age'] : null;
switch ($age) {
case '1':
echo '<script>alert("挺年轻的啊")</script>';
break;
case '2':
echo '<script>alert("年纪挺大了吧")</script>';
break;
}
$comments = isset($_REQUEST['comments']) ? $_REQUEST['comments']:null;
if (empty($comments)) {
echo '<script>alert("你就没什么想说的嘛")</script>';
} else {
echo '<script>alert("'.$comments.'")</script>';
}一些备注：
<script>alert("请输入用户名");window.history.go(-1)</script>javascript中是用分号 ; 来分隔两段语句的。
$name = isset($_REQUEST['name']) ? $_REQUEST['name'] : null;
这是一个三元运算。isset($_REQUEST['name']) 代表待验证表单中name=name这个值是否设定，如果设定了则返回这个值，就是$_REQUEST['name'] 如果为空或者没有设置则返回null
其完整语法为：条件表达式？表达式1：表达式2
