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有没有大佬帮忙一下下啊

if(isset($_POST["submit"]) && $_POST["submit"] == "登陆")

{

$user = $_POST["username"];

$psw = $_POST["password"];

if($user == "" || $psw == "")

{

echo "";

}

else

{

mysql_connect("localhost","root","sixx");

mysql_select_db("vt");

mysql_query("set names 'gbk'");

$sql = "select username,password from user where username = '$_POST[username]' and password = '$_POST[password]'";

$result = mysql_query($sql);

$num = mysql_num_rows($result);

if($num)

{

$row = mysql_fetch_array($result); //将数据以索引方式储存在数组中

echo $row[0];

}

else

{

echo "";

}

}

}

else

{

echo "";

}

?>