demo_form_validation_special 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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<!DOCTYPE HTML> 
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool在线教程(w3cschool.cn)</title>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> 
<?php
// 定义变量并默认设置为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";
if ($_SERVER["REQUEST_METHOD"] == "POST")
{
    if (empty($_POST["name"]))
    {
        $nameErr = "名字是必需的";
    }
    else
    {
        $name = test_input($_POST["name"]);
        // 检测名字是否只包含字母跟空格
        if (!preg_match("/^[a-zA-Z ]*$/",$name))
        {
            $nameErr = "只允许字母和空格"; 
        }
    }
    
    if (empty($_POST["email"]))
 
 
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运行结果
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