<?php

? $Username=$_POST['uid'];

? $password=$_POST['password'];

$bd=new MYSQLI("localhost","root","","date")

$sql="select passsword from word where username='{$Username}'";

$result=$db->query($sql);

$attr=$result->fetch_row();

if($attr[0]==$password&&empty($password))

{echo"登錄成功"}else{

echo "登錄失?。?;

}

?>

制作注冊的代碼，用PHP代碼連接數據庫時的代碼出錯