刷新页面时停止在数据库中插入数据

将用户带到新页面：

if (isset($_POST['submit'])) {  $user= $_POST['username'];  $email = $_POST['useremail'];  $pass= $_POST['password'];  mysql_query("INSERT INTO table (username, useremail, email) VALUES(`$username','$useremail','$email')");}//best outside the if statement so user isn't stuck on a white blank page.header("location: landing_page.php");exit;

通过这样做，刷新的用户将得到刷新

landing_page.php

最好的建议 ：如果没有，请检查用户是否首先存在！