session_start();
$_SESSION['ID'] = $_GET['ID'];
switch ($_GET['sayfa']) {
					case "anasayfa":
				$inc = 'index1.php'; break;
					case "hakkimda":
				$inc = 'hakkimda.php'; break;
					case "yazi":
				$inc = "yazi.php";  
				break;
					default:
				$inc = 'index1.php';break;
default;
}
include ($inc);

$ID = $_SESSION['ID']
echo $ID;