在每个循环回合分配不同的日期

Question

我在prestashop上开发了一个模块，并创建了x命令，我尝试为每个要创建的命令分配不同的日期，这是我已经拥有的：

public function newBox($theCart, $referencesProducts, $subscribeMonth, $showDate)
{
    $nbMonth = preg_replace('~\D~', '', $subscribeMonth);

    foreach ($referencesProducts as $referencesProduct) {
        $ids_product[] = Db::getInstance()->getRow('SELECT p.id_product FROM ' . _DB_PREFIX_ . 'product p WHERE p.reference =\'' . $referencesProduct . '\'');
    }

    // Si le nbMonth est égale à 1 an alors on applique un resultat à 12 (mois)
    if ($nbMonth == 1) {
        $productSelected = array_slice($ids_product, 0, 12);
    } else {
        $productSelected = array_slice($ids_product, 0, $nbMonth);
    }

    foreach ($productSelected as $product) {
        $cart = new Cart();
        $cart->id_shop_group = $theCart->id_shop_group;
        $cart->id_shop = $theCart->id_shop;
        $cart->id_customer = $theCart->id_customer;
        $cart->id_carrier = $theCart->id_carrier;
        $cart->id_address_delivery = $theCart->id_address_delivery;
        $cart->id_address_invoice = $theCart->id_address_invoice;
        $cart->id_currency = $theCart->id_currency;
        $cart->id_lang = $theCart->id_lang;
        $cart->secure_key = $theCart->secure_key;

        $cart->add();
        $cart->updateQty(1, (int) $product['id_product']);

        $this->setDate($cart->id, $showDate['date_delivery'], '');
        $cart->addCartRule(847);
        $cart->autosetProductAddress();
        $this->validateOrder($cart->id, 3, 0.00, 'Abonnement', null, null, false, $cart->secure_key);

    }
}

用于计算日期的功能：

function calcDate($date)
{
    $m = date('m', strtotime('+30 days', strtotime($date)));
    if($m >= 7 && $m < 9){
        $dateSelect = date('Y-09-d', strtotime($date));
    }else{
        $dateSelect = date('Y-m-d', strtotime('+30 days', strtotime($date)));
    }
    $N =  date("N", strtotime($dateSelect));

    if($N >6) $dateSelect = date("Y-m-d", strtotime($dateSelect . " previous Saturday"));

    return $dateSelect;
}

您知道我的代码中缺少什么吗？

谢谢您的帮助。