if (isset($_POST["add_to_cart"])) {
    if ($_GET["action"] == "add") {
        if (isset($_SESSION["cart"])) {
            $item_array_id = array_column($_SESSION["cart"], "id");
            $count = count($_SESSION["cart"]) + 1;
            $item_array = array(
                'id' => generate_random_letters(5),
                'name' => $_POST["product_name"],
                'price' => $_POST["product_price"],
                'quantity' => $_POST["product_quantity"],
                'description' => $_POST["product_description"],
                'product_additional_info' => $_POST['product_additional_info'],
                'salate_sauce' => $_POST['salate_sauce'],
            );
            $_SESSION["cart"][$count] = $item_array;
            header("Location: app_orders.php?action=product_added");
        } else {
            $item_array = array(
                'id' => generate_random_letters(5),
                'name' => $_POST["product_name"],
                'price' => $_POST["product_price"],
                'quantity' => $_POST["product_quantity"],
                'description' => $_POST["product_description"],
                'product_additional_info' => $_POST['product_additional_info'],
                'salate_sauce' => $_POST['salate_sauce'],
            );
            $_SESSION["cart"][0] = $item_array;
        }
    }
}

if ($_GET["action"] == "delete") {
    foreach ($_SESSION["cart"] as $keys => $value) {
        if ($value["id"] == $_GET["id"]) {
            unset($_SESSION["cart"][$keys]);
            header("Location: app_orders.php?action=product_deleted");
        }
    }
}