獲取特定服務的費率 - EasyPost

Question

我目前已經有EasyPost創建貨件。當我創建貨物時，它爲我提供了所有可用的服務和費率。

我想動態選擇服務，只返回該速率。

我最初會通過使用索引號讀取數組（我猜如何描述它）。

這樣做的問題是每次創建新貨件時，費率數組順序都會發生變化，因此將顯示$ shipment-> rates [0] ['rate']，然後下一次首先類。

我想用「Express」創建一個貨件並且只返回那個價格。

任何意見，將不勝感激。

這裏是我的代碼：

$name = $this->thiscustomer->cust_first . ' ' . $this->thiscustomer->cust_first; 
$street_1 = $this->thiscustomer->street_1; 
$street_2 = $this->thiscustomer->street_2; 
$city = $this->thiscustomer->city; 
$state = $this->thiscustomer->state; 
$zip = $this->thiscustomer->zip; 


$weight = $this->weight; 
    $packaging = $this->packaging; 
    $service = $this->service; 
    $caddress = $this->consultant->address; 
    $cstreet_1 = $this->consultant->street_1; 
    $cstreet_2 = $this->consultant->street_2; 
    $ccity = $this->consultant->city; 
    $cstate = $this->consultant->state; 
    $czip = $this->consultant->zip; 
    $cname = $this->consultant->first_name . ' ' . $this->consultant->last_name; 
    $cuser_id = $this->consultant->user_id; 




require_once(dirname(__FILE__) . '/lib/easypost.php'); 
\EasyPost\EasyPost::setApiKey('KUk4fZUI6YaYc1h0FiIXFw'); 


$shipment = \EasyPost\Shipment::create(array(
'to_address' => array(
"name" => $name, 
"street1" => $street_1, 
"street2" => $street_2, 
"city" => $city, 
"state" => $state, 
"zip"  => $zip 
), 
'from_address' => array(
"company" => $cname, 
"street1" => $cstreet_1, 
"street2" => $cstreet_2, 
"city" => $ccity, 
"state" => $cstate, 
"zip"  => $czip 
), 
'parcel' => array(
'weight' => $weight, 
'predefined_package'=> $packaging 
), 
'rates' => array(
    'service' => $service 
) 

)); 

echo $shipment->rates[0]['rate']. '<br>'; 

Answer 1

在EasyPost的Getting Started Guide有購買特定載體+率的一個例子：

$shipment->buy($shipment->lowest_rate(array('USPS'), array('Express')));