原生php实现自定义表单（基础类型）（特色：防止重复提交 防止输出空数据等等功能）

-- phpMyAdmin SQL Dump
-- version 4.5.1
-- http://www.phpmyadmin.net
--
-- Host: 127.0.0.1
-- Generation Time: 2022-03-31 14:41:20
-- 服务器版本： 10.1.13-MariaDB
-- PHP Version: 5.6.21
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
--
-- Database: `a`
--
-- --------------------------------------------------------
--
-- 表的结构 `form`
--
CREATE TABLE `form` (
  `id` int(11) NOT NULL,
  `type` varchar(255) COLLATE utf8_vietnamese_ci NOT NULL COMMENT '类型'
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_vietnamese_ci;
--
-- Indexes for dumped tables
--
--
-- Indexes for table `form`
--
ALTER TABLE `form`
  ADD PRIMARY KEY (`id`);
--
-- 在导出的表使用AUTO_INCREMENT
--
--
-- 使用表AUTO_INCREMENT `form`
--
ALTER TABLE `form`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=65;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

<?php
SESSION_START(); 
$_SESSION['is_submit'] = 0;
header("Content-type:text/html;charset=utf-8");
?>
<style>
body{
background:#ccc;
}
.blue
{
    background:rgba(255,123,169);
    width: 260px;
    height:auto;
}
</style>
    <form action="cyg1.php" method="POST"> 
    您喜欢的水果？<br /><br /> 
    <label><input name="text" type="checkbox" value="text" />文本类型</label> <br>
    <label><input name="color" type="checkbox" value="color" />颜色类型</label> <br>
    <label><input name="date" type="checkbox" value="date" />日期类型</label> <br>
    <label><input name="password" type="checkbox" value="password" />密码类型</label> <br>
    <input name="button" type="checkbox" value="button"/>按钮类型</label> <br>
    <input name="email" type="checkbox" value="email" />邮箱类型</label> <br>
    <input name="number" type="checkbox" value="number" />数字类型</label> 
    <input type="submit" value="提交">
    </form> 

<?php
SESSION_START(); //防止表单重复提交
if (isset($_POST['submit'])) { 
    if ($_SESSION['is_submit'] == '0') { 
        $_SESSION['is_submit'] = '1'; 
        echo "代码块，要做的事，代码...<a οnclick='history.go(-1);' href='javascript:void(0)'>返回</a>"; 
    } else { 
        echo "请不用重复提交<a href='index.php'>PHP+SESSION防止表单重复提交</a>"; 
    } 
}
$link=mysqli_connect('localhost','root','','a');
//然后是指定php链接数据库的字符集
mysqli_set_charset($link,'utf8');
$arr=[$_POST['text'],$_POST['color'],$_POST['date'],$_POST['password'],$_POST['button'],$_POST['email'],$_POST['number']];
foreach ($arr as $key => $value) {
  if(empty($value))
  {
  unset( $arr[$key] );   
  }
}
foreach ($arr as $key => $value) 
{
$sql = "INSERT INTO form(type)
VALUES ('{$value}')";
mysqli_query($link,$sql);
}
$sql="select type from form";
$result=mysqli_query($link,$sql);//运行sql
echo "<form>";
      while ($row=mysqli_fetch_assoc($result)) {
        echo $row['type']."类型:"."<input type='$row[type]' />";
    }
echo "</form>";