<?php 
 header("Content-Type:text/html;charset=utf-8"); 
 session_start(); 
 if(isset($_POST['login'])) 
 { 
  $username = trim($_POST['username']); 
  $password = trim($_POST['password']); 
  if(($username=='')||($password=='')) 
  { 
   header('refresh:3;url=dl.html'); 
   echo "改用户名或密码不能为空，3秒后跳转到登录页面"; 
   exit; 
  } 
  else if(($username!='sainao')||($password!='sainao.2021mm')) 
  { 
   //用户名或密码错误 
   header('refresh:3;url=dl.html'); 
   echo "用户名或密码错误，请重新登录！或者联系技术微信：wxmingyan-----小伙子不要乱来哦！我已经注意到你了"; 
   exit; 
  } 
  else if(($username=='sainao')&&($password=='sainao.2021mm')) 
  { 
   //登录成功将信息保存到session中 
   $_SESSION['username']=$username; 
   $_SESSION['islogin']=1; 
   //如果勾选7天内自动保存，则将其保存到cookie 
   if($_POST['remember']=="yes") 
   { 
    setcookie("username",$username,time()+7*24*60*60); 
    setcookie("code",md5($username.md5($password)),time()+7*24*60*60); 
   } 
   else
   { 
    setcookie("username",'',time()-1); 
    setcookie("code",'',time()-1); 
   } 
   //跳转到用户首页 
   header('refresh:0.1;url=myuming.php'); 
  } 
 } 
?>