Php cart api只获取产品的一个详细信息，但如果存在，我需要每个产品的详细信息

这是我的控制器代码

   public function usercart()
{
    $this->default_file();
    $responseData = array();

    $id = $this->input->post('id');
    $cartDetails = array();
    $product_id = array();
    if(!empty($id))
    {
        $cartData = $this->apm->getUserCartDetails($id);
        if(!empty($cartData['result']))
        {
            foreach($cartData['result'] as $key => $cart)
            {
                $cartDetails[$key]['cart_product_id'] = $cart['cart_product_id'];
                $cartDetails[$key]['cart_qty'] = $cart['cart_qty'];
                $cartDetails[$key]['cart_price'] = $cart['cart_price'];
                //$cartDetails[$key]['cart_product_price'] = $cart['cart_product_price'];
            }
            $responseData['cart_details'] = $cartDetails;
        }
        else
        {
            $responseData['cart_details'] = [];
        }
        $product_id = $cartDetails[$key]['cart_product_id'];
        print_r($product_id);
        $productData = array();
        if(!empty($product_id))
        {
            $productDetails = $this->apm->productDetails($product_id);
            if(!empty($productDetails['result']))
            {
                foreach($productDetails['result'] as $key => $prod)
                {
                    $productData[$key]['product_img'] = base_url().'Images/ProductImages/'.$prod['product_img'];
                    $productData[$key]['p_id'] = $prod['p_id'];
                    $productData[$key]['product_title'] = $prod['product_title'];
                    $productData[$key]['product_color'] = $prod['product_color'];
                    $productData[$key]['product_size'] = $prod['product_size'];
                }
                $responseData['product_details'] = $productData;
            }
            else
            {
                $responseData['product_details'] = [];
            }
        }
        if(!empty($responseData))
        {
            $responseArray = array(
                'apiName' => 'user cart',
                'version' => '1.0.0',
                'responseCode' => 200,
                'responseMessage' => "User cart list",
                'responseData' => $responseData
            );
        }
        else
        {
            $responseArray = array(
                'apiName' => 'user cart',
                'version' => '1.0.0',
                'responseCode' => 204,
                'responseMessage' => "User cart is empty",
                'responseData' => $responseData
            );
        }
    }
    else
    {
        $responseArray = array(
            'apiName' => 'user cart',
            'version' => '1.0.0',
            'responseCode' => 200,
            'responseMessage' => "User cart is empty",
            'responseData' => $responseData
        );
    }
    echo json_encode($responseArray);
    die();
  }

这段代码的模态在这里

   public function getUserCartDetails($id)
    {
    $arrData = array();

    $this->db->select('*');
    $this->db->from('cart');
    $this->db->where('cart_user_id', $id);
    $result = $this->db->get()->result_array();
    if(!empty($result))
    {
        $arrData['result'] = $result;
    }
    else
    {
        $arrData['result'] = '';
    }
    return $arrData;
}

public function productDetails($id = array())
{
    $arrData = array();
    $this->db->select('*');
    $this->db->from('product');
    $this->db->where('p_id', $id);

    $result = $this->db->get()->result_array();
    if(!empty($result))
    {
        $arrData['result'] = $result;
    }
    else
    {
        $arrData['result'] = '';
    }
    return $arrData;
}

我在购物车表中有两个具有相同用户id的产品。我单击我的购物车图标，它将显示两个产品详细信息，但它仅显示一个产品详细信息。但是我可以看到这里我使用print\r传递了两个产品id，如果我使用一个变量来存储这些产品id，并使用foreach循环来获取每个产品的详细信息，它会弹出一个传递无效参数的错误