这段代码一直有异常，麻烦大神看下

<a href ='index.php' >返回留言板</a><hr><hr>
<?php
/*

 * To change the template for this generated file go to

 * Window - Preferences - PHPeclipse - PHP - Code Templates

 */
require("conn.php");
 $user=$_POST['user'];
 $title=$_POST['title'];
$content=$_POST['content'];
$sql_luck="insert into sny (id,user,title,content,lastDate)value('','$user','$title','$content',now())"	
 $sql="SELECT user FROM sny WHERE user='$user'";
 $query =mysql_query($sql);
 $rows=mysql_fetch_array($query);
if((!empty($_POST['sub']))and($rows['user']==$user)){
//echo $content;
 	echo "<script>alert('用户已存在，请重新输入');location.href='add2.php'</script>" ;exit;  
  mysql_free_result($query);exit;
 }
 else{
  mysql_query($sql_luck);
  echo"<script>alert('哟！成功！');location.href='index.php'</script>";
  echo "插入成功";
 }
?>
<form action="add.php" method="post">
用户：<input type="text" name="user" value="请输入用户名" size="20" maxlength="10"/><br/>
标题:<input type="text" name="title" value="请输入内容" size="40" maxlength="40"/><br/>
内容:<textarea name="content" rows="10" cols="50" wrap="off">
text</textarea>
 <br/>
  <input type="submit" name="sub" value="Release"/><br/>
  <form/>

解决方案

你if判断仔细看看里边缕缕。好么？