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Kode 

<?
		$login = $_GET['login'];
		
		if($login == "login_done")
			{
				
				$username = $_POST['username'];
				$password = $_POST['password'];

				include "connect.php";
		
				$con = mysql_connect ("$host","$user","$pass");
					
						if(!isset($con))
						{
							die('Could not connect to the server');
						}
						else
						{
							mysql_select_db("$db" , $con);
						}
				
			$sql = sprintf("SELECT * FROM $members WHERE username='$username' and password='$password' LIMIT 1");
		
				$result = mysql_query($sql,$con);
		
				$count = mysql_num_rows($result);
				
				if ($count == '1')
				{
					setcookie("user_data", '$username', time()+3600);
					header("location:../mainpage.php?login=login_succes");
				}
				else 
				{
					header("location:?login=failed");
				}
			}
			?>

Kode 

setcookie("user_data", '$username', time()+3600);

Kode 

 <?
		print_r($_COOKIE);
	?>