php cookie 代码

<?php
if((isset($_COOKIE['user']))&&(isset($_COOKIE['password'])))
{
  $user=$_COOKIE['user'];
  $password=$_COOKIE['password'];
  if(($user==="admin")&&($password==="admin")) die("hello,admin!");
  else die("you are a hacker");
}
else
{
  setcookie("user","admin",time()+60*60*24*30);
  setcookie("password","admin",time()+60*60*24*30);
  die("I have give you a cookie");
}
?>