亚马逊产品广告API阅读优先

Question

我使用Amazon Product Advertising API PHP Class from Codediesel。

我使用的功能getItemByAsin，改变了ResponseGroup到Offers，因为我想获得IsEligibleForPrime最便宜的报价（见Amazon JSON response。

由于有更多然后1个报价在offer标签内的响应，我不知道如何读的第一个

这里是一个效应初探样子：

<Item> 
    <ASIN>047061529X</ASIN> 
<Offers> 
    <TotalOffers>2</TotalOffers> 
    <TotalOfferPages>1</TotalOfferPages> 
    <MoreOffersUrl>http://www.amazon.com/gp/offer-listing/047061529X/?SubscriptionId=AKIAI44QH8DHBEXAMPLE&ie=UTF8&tag=adrpik-20&creative=386001&camp=2025&linkCode=xm2 </MoreOffersUrl> 
    <Offer> 
     <OfferAttributes> 
     <Condition>New</Condition> 
     </OfferAttributes> 
     <OfferListing> 
     <OfferListingId>6vZH%2FR4dOoabV7sTSv3vC0Np5xK1c8MKOhAl5HYbCIJhxOLlJw1O2AM6mLYyVhjnI8s2gMkx7yq%2F%2BEC7yKPWkQTqhVhFBeUDm71EdpaYwrXpppfcAL1yPzyQFkOuK6MsK8aLPSNSWVs%3D </OfferListingId> 
     <Price> 
      <Amount>1025</Amount> 
      <CurrencyCode>USD</CurrencyCode> 
      <FormattedPrice>$10.25</FormattedPrice> 
     </Price> 
     <AmountSaved> 
      <Amount>974</Amount> 
      <CurrencyCode>USD</CurrencyCode> 
      <FormattedPrice>$9.74</FormattedPrice> 
     </AmountSaved> 
     <PercentageSaved>49</PercentageSaved> 
     <Availability>Usually ships in 1-2 business days</Availability> 
     <AvailabilityAttributes> 
      <AvailabilityType>now</AvailabilityType> 
      <MinimumHours>24</MinimumHours> 
      <MaximumHours>48</MaximumHours> 
     </AvailabilityAttributes> 
     <IsEligibleForSuperSaverShipping>0</IsEligibleForSuperSaverShipping> 
     <IsEligibleForPrime>1</IsEligibleForPrime> 
     </OfferListing> 
    </Offer> 
    <Offer> 
    <OfferAttributes> 
    <Condition>Used</Condition> 
    </OfferAttributes> 
    <OfferListing> 
    <OfferListingId>uXUlLeu7rH5t3ogkZJ%2Bd11tWCsdsj5kHhjoscRF1D1GuBuDwCyrz0XyR%2BTEOJO7PgpfwLjtX4ojhbXeHZgM0Br4DiWsPhNZTduzvYC8zLgG0z1e%2FgYiiuuR0wTyKqssY6ncHyVjZK1A%3D </OfferListingId> 
    <Price> 
     <Amount>1110</Amount> 
     <CurrencyCode>USD</CurrencyCode> 
     <FormattedPrice>$11.10</FormattedPrice> 
    </Price> 
    <AmountSaved> 
     <Amount>889</Amount> 
     <CurrencyCode>USD</CurrencyCode> 
     <FormattedPrice>$8.89</FormattedPrice> 
    </AmountSaved> 
    <PercentageSaved>44</PercentageSaved> 
    <Availability>Usually ships in 1-2 business days</Availability> 
    <AvailabilityAttributes> 
     <AvailabilityType>now</AvailabilityType> 
     <MinimumHours>24</MinimumHours> 
     <MaximumHours>48</MaximumHours> 
    </AvailabilityAttributes> 
    <IsEligibleForSuperSaverShipping>0</IsEligibleForSuperSaverShipping> 
    <IsEligibleForPrime>1</IsEligibleForPrime> 
    </OfferListing> 
</Offer> 
</Offers> 

如何从第一个<Offer></Offer>中读取IsEligibleForPrime？

Answer 1

比方说，你在namepace环境

工作首先声明命名空间

namespace Amazon; 

其次，实例化的变量。然后，调用类的构造函数：

/** 
* Check from Amazon 
* @param string The ASIN we are looking for 
*/ 
public function __construct($asin) 
{ 
    $this->amazonAPI = new AmazonProductAPI(); // Or call from it right place 
    $this->asin = $asin; 
    $this->getResults(); 
} 

在那里，你给谁打电话找你想要的结果的函数：

private function getResults() 
{ 
    // Call public function getItemByAsin($asin_code) from AmazonProductAPI class 
    $items = $this->amazonAPI->getItemByAsin($this->asin); 

    foreach ($items->Items->Item->Offers as $offer) { 

     if ($offer->Offer->OfferAttributes->Condition == 'New') { 
      $IsEligibleForPrime = $offer->Offer->OfferListing->IsEligibleForPrime; 
     } 
    } 
    $this->eligible = $IsEligibleForPrime == 1 ? 1 : 0; 
} 

我已经测试此代码，它的工作原理为ASIN你给你的问题。下面是结果：

1. 可享有

   Amazon {#17 ▼ 
       +asin: "047061529X" 
       -amazonAPI: AmazonProductAPI {#16 ▼ 
       -public_key: "**********" 
       -private_key: "**********" 
       -associate_tag: "**********" 
       } 
       -eligible: 1 
   } 
   

2. 没有资格

   Amazon {#17 ▼ 
       +asin: "B01E67UWX2" 
       -amazonAPI: AmazonProductAPI {#16 ▶} 
       -eligible: 0 
   } 
   

---

完整的源：

namespace devSO\Amazon; 

class Amazon 
{ 
    /** 
    * @var string 
    */ 
    public $asin; 

    /** 
    * @var object 
    */ 
    private $amazonAPI; 

    /** 
    * @var int 
    */ 
    private $eligible; 

    /** 
    * Check from Amazon 
    * @param string The ASIN we are looking for 
    */ 
    public function __construct($asin) 
    { 
     $this->amazonAPI = new AmazonProductAPI(); // Or call from it right place 
     $this->asin = $asin; 
     $this->getResults(); 
    } 

    private function getResults() 
    { 
     // Call public function getItemByAsin($asin_code) from AmazonProductAPI class 
     $items = $this->amazonAPI->getItemByAsin($this->asin); 

     foreach ($items->Items->Item->Offers as $offer) { 

      if ($offer->Offer->OfferAttributes->Condition == 'New') { 
       $IsEligibleForPrime = $offer->Offer->OfferListing->IsEligibleForPrime; 
      } 
     } 
     $this->eligible = $IsEligibleForPrime == 1 ? 1 : 0; 
    } 
} 

而且，事实上，你必须在getItemByAsin功能指定

"ResponseGroup" => "Medium,Offers" 

从AmazonProductAPI类