php mysql 未定义索引

Question

我有三个 php 页面，第一个页面是在字段中输入用户详细信息，第二个页面是在数据库中插入用户详细信息，第三个页面是显示已发送到数据库的用户详细信息，

一切正常，除了在第三页中未出现用户详细信息并且我收到此错误消息:

注意: undefined variable :用户 注意: undefined variable :电子邮件 注意: undefined variable :pass

这是我的代码:

first_page.php

<form action="second_page.php" method="post" >
User Name:  
<input  type="text" name="username" >
User Email
<input  type="text" name="useremail" >
Password:  
<input  type="text" name="password" >
<input type="submit"  name="submit" >
</form>

<小时/>

第二页.php

if (isset($_POST['submit'])) 
{
$user= $_POST['username'];
$email = $_POST['useremail'];
$pass= $_POST['password']; 

mysql_query("INSERT INTO table (username, useremail, password) VALUES  ('$user','$emai','$pass');
header("location: third_page.php");
exit;

<小时/>

third_page.php

$user= $_POST['username'];
$email = $_POST['useremail'];
$pass= $_POST['password']; 

echo ' the user name: '.$user;
echo ' the user email:.'$email;
echo 'the user password:.'$pass;

Answer 1

$user_id = mysql_insert_id();
header("location: third_page.php?id=$user_id");

anf ftech data from datbase