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p代码中获取表单中单选按钮的值：（单选按钮只能让我们选择一个，这里有一个“checked”属性，这是用来默认选取的，我们每次刷新我们的页面时就默认为这个值。）
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例：form name="myform" action="" method="post"
性别:
input type="radio" name="sex" value="男" checked /男input name="sex" type="radio" value="女" /女
input type="submit" name="submit" value="提交" /
/form
?php
echo "您的选择是：";
echo $_POST["sex"];
?
如果你选择的是男，则出来的值就是“男”，要是你选择的是女，则出来的值就是“女”。
!--表单文件，拷入index.php--
!DOCTYPE html
html
head
style
label{display:inline-block;width:100px;margin-bottom:10px;}
/style
titleAdd students/title
/head
body
!-- 数据库用mysqli 面向过程调用方法--
form method="post" action="write2db.php"
!--数据库用mysqli 面向过程调用方法
form method="post" action="write2db_sqlio.php"
--
!--数据库用PDO调用方法
form method="post" action="write2db_pdo.php"
--
labelFirst Name/label
input type="text" name="first_name" /
br /
labelLast Name/label
input type="text" name="last_name" /
br /
labeldepartment/label
input type="text" name="department" /
br /
labelEmail/label
input type="text" name="email" /
br /
input type="submit" value="Add students"
/form
/body
/html
------------------------------
?php
//拷贝命名为write2db.php,数据库用mysqli 面向过程调用方法
//print_r($_POST);
// create a variable
$first_name=$_POST['first_name'];
$last_name=$_POST['last_name'];
$department=$_POST['department'];
$email=$_POST['email'];
//调试用
echo "Your input: ";
echo $first_name;
echo 'br /';
echo $last_name;
echo 'br /';
echo $department;
echo 'br /';
echo $email;
echo 'br /';
$servername = "localhost";
//Your database username and password
//$username = "username";
//$password = "password";
$username = "tester";
$password = "testerPassword";
//your database name
$dbname = "test";
$tablename ="student";
// Create connection
$connect = mysqli_connect($servername, $username, $password, $dbname);
if (!$connect) {
die("Connection failed: " . mysqli_connect_error());
}
//Execute the query
$sql="INSERT INTO $tablename (first_name,last_name,department,email)
VALUES('$first_name','$last_name','$department','$email')";
if (mysqli_query($connect, $sql)) {
echo "Hooray! New record is inserted to database successfully. Please check database.";
} else {
echo "Error: " . $sql . "br /" . mysqli_error($connect);
}
mysqli_close($connect);
?
?php
//拷贝命名为write2db_sqlio.php,数据库用mysqli 面向对象调用方法
//print_r($_POST);
// create a variable
$first_name=$_POST['first_name'];
$last_name=$_POST['last_name'];
$department=$_POST['department'];
$email=$_POST['email'];
//调试用
echo "Your input: ";
echo $first_name;
echo 'br /';
echo $last_name;
echo 'br /';
echo $department;
echo 'br /';
echo $email;
echo 'br /';
$servername = "localhost";
//Your database username and password
//$username = "username";
//$password = "password";
$username = "tester";
$password = "testerPassword";
//database name
$dbname = "test";
$tablename ="student";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn-connect_error) {
die("Connection failed: " . $conn-connect_error);
}
$sql="INSERT INTO $tablename (first_name,last_name,department,email)
VALUES('$first_name','$last_name','$department','$email')";
if ($conn-query($sql) === TRUE) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "br" . $conn-error;
}
$conn-close();
?
?php
//拷贝为文件write2db_pdo.php,数据库用PDO调用方法
//print_r($_POST);
a variable
$first_name=$_POST['first_name'];
$last_name=$_POST['last_name'];
$department=$_POST['department'];
$email=$_POST['email'];
//调试用
echo "Your input: ";
echo $first_name;
echo 'br /';
echo $last_name;
echo 'br /';
echo $department;
echo 'br /';
echo $email;
echo 'br /';
$servername = "localhost";
//Your database username and password
//$username = "username";
//$password = "password";
$username = "tester";
$password = "testerPassword";
//your database name
$dbname = "test";
$tablename ="student";
// Create connection
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn-setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql="INSERT INTO $tablename (first_name,last_name,department,email)
VALUES('$first_name','$last_name','$department','$email')";
// use exec()
$conn-exec($sql);
echo "New record created successfully";
}
catch(PDOException $e)
{
echo $sql . "br" . $e-getMessage();
}
$conn = null;
?
--创建数据库test, 将此文件存为test.sql 导入数据库，或者手动创建表结构
-- phpMyAdmin SQL Dump
-- version 4.7.4
--
--
-- Host: 127.0.0.1:3306
-- Generation Time: Mar 12, 2018 at 04:04 AM
-- Server version: 5.7.19
-- PHP Version: 7.1.9
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
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: `test`
--
-- --------------------------------------------------------
--
-- Table structure for table `student`
--
DROP TABLE IF EXISTS `student`;
CREATE TABLE IF NOT EXISTS `student` (
`id` tinyint(3) UNSIGNED NOT NULL AUTO_INCREMENT,
`first_name` varchar(20) NOT NULL,
`last_name` varchar(20) NOT NULL,
`department` varchar(50) NOT NULL,
`email` varchar(50) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
--
-- Dumping data for table `student`
--
INSERT INTO `student` (`id`, `first_name`, `last_name`, `department`, `email`) VALUES
(1, 'first1', 'last1', 'cs', '1985@qq.com');
COMMIT;
/*!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 */;
1：首先要使用PHP的超全局变量 $_GET 和 $_POST 用于收集表单数据（form-data）
2：然后使用INSERT INTO 语句用于向数据库表中插入新记录。
具体示例：
（1）首先创建了一个名为 "Persons" 的表，有三个列："Firstname", "Lastname" 以及 "Age"。
?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("my_db", $con);
mysql_query("INSERT INTO Persons (FirstName, LastName, Age)
VALUES ('Peter', 'Griffin', '35')");
mysql_query("INSERT INTO Persons (FirstName, LastName, Age)
VALUES ('Glenn', 'Quagmire', '33')");
mysql_close($con);
?
（2）其次创建一个 HTML 表单，这个表单可把新记录插入 "Persons" 表。
html
body
form action="insert.php" method="post"
Firstname: input type="text" name="firstname" /
Lastname: input type="text" name="lastname" /
Age: input type="text" name="age" /
input type="submit" /
/form
/body
/html
（3）接着当用户点击上例中 HTML 表单中的提交按钮时，表单数据被发送到 "insert.php"。"insert.php" 文件连接数据库，并通过
$_POST 变量从表单取回值。然后，mysql_query() 函数执行 INSERT INTO 语句，一条新的记录会添加到数据库表中。
?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("my_db", $con);
$sql="INSERT INTO Persons (FirstName, LastName, Age)
VALUES
('$_POST[firstname]','$_POST[lastname]','$_POST[age]')";
if (!mysql_query($sql,$con))
{
die('Error: ' . mysql_error());
}
echo "1 record added";
mysql_close($con)
?