php 注册有关问题 求解

php 注册问题 求解!


Notice: Undefined variable: POST in D:\www\bbs\reg.php on line 5

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php include("conn.php"); include("head.php");if(isset($_POST['submit'])) {    $sql="insert into user_list(uid,username,password,email,regdate)values('','$POST[username]','$POST[password]','$POST[email]',now())";   mysql_query($sql);    "<script language = \"javascript\">alert('添加成功');history.go(-1)";}?>

用户名：
确认密码：
邮箱：

------解决方案--------------------
,'$POST[username]','$POST[password]','$POST[email]' ???

$_POST