老是报错，Notice: Undefined index: submit in H:\php\MessageBoard\add.php on line 11
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<?php
/*
* Created on 2012-7-13
*
* author:jaeheng
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
//包含数据库连接文件
include("conn.php");
//插入语句
if($_POST['submit']){
$sql="insert into message (id,user,title,content,lastdate) " .
"values ('','$_POST[user]','$_POST[title]','$_POST[content]',now())";
mysql_query($sql);
echo "发表成功";
}
?>
<form action="add.php" method="post">
用户：<input type="text" size="10" name="user"/><br />
标题：<input type="text" name="title"/><br />
内容：<textarea name="content"></textarea><br/>
<input type="submit" name="submit" value="发布留言"/>
</form>
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