Preview:
case "remove":
	if(!empty($_SESSION["cart_item"])) {
		foreach($_SESSION["cart_item"] as $k => $v) {
			if($_GET["code"] == $k)
				unset($_SESSION["cart_item"][$k]);				
			if(empty($_SESSION["cart_item"]))
				unset($_SESSION["cart_item"]);
		}
	}
	break;
case "empty":
	unset($_SESSION["cart_item"]);
        break;
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