php提交服务器表单到数据库基础代码

<?php
$userId   = $_POST['userId'];
$userName = $_POST['userName'];
$userAge  = $_POST['userAge'];

echo "用户编号:" .$userId."<br/>";
echo "用户姓名:" .$userName."<br/>";
echo "用户年龄:" .$userAge."<br/>";

//获取链接
$url = "localhost";
$user = "root";
$password = "123456";
//连接
$con = mysql_connect($url,$user,$password);
//设置编码机
mysql_query("set names 'utf8'");
mysql_select_db("test");
$sql = "create table user_info (user_id int,user_name varchar(255),user_age varchar(255));";
if (!mysql_query($sql,$con))
{
die('Error: ' . mysql_error());
}
$sql = "insert into user_info (user_id,user_name,user_age)  values('$userId','$userName','$userAge')";
if (!mysql_query($sql,$con))
{
die('Error: ' . mysql_error());
}
echo "添加一条记录";
mysql_close($con);
?>