public function list_import_product_to_json_data($data)
 {
     //new a new receipt
     //basically, a Reiceipt is a list of product...
     $receipt = new Receipt();
     foreach ($data as $value) {
         //new Product
         $product = new ImportProduct($value['Import_Price']);
         // add attribute to it
         $product->add_attribute($value['Name'], new Unit($value['UnitName'], $value['Price']), $value['Id'], $value['ProductId']);
         //add the product to the receipt
         $receipt->add($product);
     }
     // return the receipt in json format
     return $receipt->json_encode();
 }
function push_new_product_data_to_server($array)
{
    if (sizeof($array) == 0) {
        return;
    }
    $receipt = new Receipt();
    foreach ($array as $key => $product) {
        if (isset($product['name'])) {
            $import_product = new ImportProduct($product['bought']);
            $import_product->add_attribute($product['name'], new Unit($product['unit_name'], $product['sale']));
            $receipt->add($import_product);
        }
    }
    echo $receipt->json_encode(true);
    $manage = new Management();
    $manage->push_new_product_data_to_server($receipt);
}