购物车session接值，累加

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	if(!@in_array($_GET['id'],$_SESSION['id']))
			{
				$_SESSION['sum'][] = $_POST['num'];
				$_SESSION['id'][] = $_GET['id'];
				
			}
			else
			{
				$kk = array_search($_GET['id'],$_SESSION['id']);
				$_SESSION['sum'][$kk] += $_POST['num'];
			}