$username = $_POST["username"];
$password = $_POST["password"]; 

$sorgu = $db->query("SELECT username FROM members WHERE username='$username' and pass='$password'");
$sorguResult = $db->num_rows;
if($sorguResult>0)
	{
	ob_start();
	session_start();
	$kullanici = $username;
	$_SESSION['username'] = $kullanici;
	header("Location: uye/$kullanici");
	}