cookie login

-
<?php


$con = mysqli_connect("localhost","root","root","cookielogin") or die(mysqli_error($con));
session_start();
if(isset($_POST['btn_login']))
{
    extract($_POST);
   
   
    $query=mysqli_query($con,"select * from login where  username='$username' and password='$password'" ) or die(mysqli_error($con));
     $row=mysqli_fetch_assoc($query);
     
     if($row)
     {
         if(!empty($_POST['re'])){
         setcookie("username",$_POST['username'],time() + (48*60*60));
         setcookie("password",$_POST['password'],time() + (24*60*60));
         }
         else
         {
             if(isset($_COOKIE['username']))
             {
                 setcookie("username","");
             }
             if(isset($_COOKIE['password']))
             {
                 setcookie("password","");
             }
         }
         header("location:welcome.php");
     }else
     {
         $message="Invalid login";
     }
     
   
}
?>
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.1.min.js"></script>


</head>
<body>


<?php if(isset($message)) { echo $message; }?>
<form method="POST">
Username:<input type="text" name="username" value="<?php if(isset($_COOKIE['username'])) { echo $_COOKIE['username']; }?>"><br><br>
Password:<input type="password" name="password" value=""><br><br>
<input type="checkbox" name="re" <?php if(isset($_COOKIE['username'])) { ?> checked <?php }?> >Remeber Me <br><br><br>

<input type="submit" name="btn_login"  value="LOGIN">
</form>

</body>
</html>

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