3天了，问题还没解决。。。

<?
header("Content-Type:text/html; charset=utf-8");
include('conn.php');
$user=$_POST['user'];
$pass=$_POST['pass'];
$result=mysql_query("select user from wjob_user where user='".$user."'");
//检测数据库user
$row=mysql_fetch_array($result);
//将检测user列组合数组
$sql="insert into `wjob_user` (`pass`,`user`,`date`) values ('".$pass."','".$user."','".$date."')";
//要插入数据库的内容
$zc=mysql_query($sql);
//插入数据库
$ech='<form action="reg.php" medhod="post">
账号:<input type="text" name="user" value=""><br>
密码:<input type="text" name="pass" value=""><br>
<input type="submit" name="submit" value="注册"></form>';
if($_POST['submit'] && $row['user']){
echo '账号已存在';
}elseif($_POST['submit'] && $zc){
echo '注册成功';
}else{
echo $ech;
}
?>