$_POST method turns emty : Firstable, hello everyone. I have issue about the $_POST method, when I write this code block;

    if (isset($_POST['menuduzenle'])) {

	$menu_id=$_POST['menu_id']; //It didn't turn with value in mysql

	$ayarguncelle=mysql_query("update menuler set menu_ad='".$_POST['menu_ad']."',menu_link='".$_POST['menu_link']."'where menu_id='$menu_id'");


	if(mysql_affected_rows())
	{

		header("Location:../menuleriduzenle.php?guncelleme=basarili&menu_id=$menu_id");
	}else{

		header("Location:../menuleriduzenle.php?guncelleme=basarisiz&menu_id=$menu_id");}


	}

menu_id turns emty, what I need to do for solve this? 

