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//通过  $storeId,分类id，几天之前的数据。 返回 $products

public function getBestsellingProducts($storeId,$category_id,$days)    {          $productCount = 4;        $today = time();        $last = $today - (60*60*24*$days);            $from = date("Y-m-d", $last);        $to = date("Y-m-d", $today);                 // get most viewed products for current category        $products = Mage::getResourceModel('reports/product_collection')                        ->addAttributeToSelect('*')                             ->addOrderedQty($from, $to)                        ->setStoreId($storeId)                        ->addCategoryFilter(Mage::getModel('catalog/category')->load($category_id))                        ->addStoreFilter($storeId)                                          ->setOrder('ordered_qty', 'desc')                        ->setPageSize($productCount);                 Mage::getSingleton('catalog/product_status')                ->addVisibleFilterToCollection($products);        Mage::getSingleton('catalog/product_visibility')                ->addVisibleInCatalogFilterToCollection($products);                 return $products;    }

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