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So let s ask for some more data by using response groups. At the end of the link you ve composed earlier, add the following string to get more specific information about the book: &ResponseGroup=Request,SalesRank,Small,Images,OfferSummary. The complete link should look like this: http://webservices.amazon.com/onca/xml Service=AWSECommerceService &AWSAccessKeyId=[Your Access Key ID] &Operation=ItemLookup &IdType=ASIN &ItemId=159059648X &ResponseGroup=Request,SalesRank,Small,Images,OfferSummary The new XML response from Amazon.com includes more details about the Amazon.com item, as shown in Figure 17-4.
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Figure 17-4. The XML response of a Web Service request We have just mixed five response groups: Request, SalesRank, Small, Images, and OfferSummary. To learn more about the response groups, go to http://developer. amazonwebservices.com/connect/kbcategory.jspa categoryID=5, and click the Latest Tech. Docs button. Alternatively, you can click the Technical Documentation link, and then click
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the link of the latest documentation version. You can download the documentation in PDF format, or you can read it online here: http://docs.amazonwebservices.com/ AWSEcommerceService/2006-09-13/. In the ECS documentation, find the response groups details under the API Reference, Response Groups section. Here s the description for the five response groups used in the previous example: Request response group is a default response group in every kind of operation, and it returns the list of name-value pairs you used to make the request. Sales Rank response group returns data about the current Amazon.com sales rank of the product. Small response group returns general item data (ASIN, item name, URL, and so on) about items included in the response. This is a default response group for an ItemLookup operation (like we have in this example). Images response group gives you the addresses for the three pictures (small, medium, and large) for each item in the response. OfferSummary response group returns price information for each item in the response. Let s continue by learning how to make a REST request from PHP To populate the future . Amazon Super Hats department, you ll search the Amazon.com Apparel department for the super hats keywords. One trivial way is to use the PHP file_get_contents function, as you can see in the following script. To test accessing Web Services using REST, create a new file named test_rest.php in your hatshop directory, and write the following code in it: < php // Tell the browser it is going to receive an XML document. header('Content-type: text/xml'); /* DON'T FORGET to replace the string '[Your Access Key ID]' with your Access Key ID in the following line */ $url = 'http://webservices.amazon.com/onca/xml Service=AWSECommerceService' . '&AWSAccessKeyId=[Your Access Key ID]' . '&Operation=ItemSearch' . '&Keywords=super+hats' . '&SearchIndex=Apparel' . '&ResponseGroup=Request,Medium'; echo file_get_contents($url); >
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N ote Some PHP installations and web hosting providers may not allow this code to run by default. In that
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case, you can change this setting in php.ini:
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Alternatively, you can add the following line to include/config.php. This second solution is preferred because it only affects your application, and it remains set if you need to move the application to another server. ini_set('allow_url_fopen', 'On');
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Loading http://localhost/hatshop/test_rest.php will show you XML data about Amazon s Super Hats (see Figure 17-5).
Figure 17-5. Super Hats from Amazon
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To exercise and build more XML links, just study the examples in the API Reference section of the ECS 4.0 documentation. The material will show you how to do a variety of Amazon operations using REST.
Accessing Amazon E-Commerce Service Using SOAP
Using SOAP you use a complex API to access the needed Amazon.com functionality. The , following code, which performs the same search operation for hats that you did earlier with REST, is using the AWSECommerceService, ItemSearch, and ItemSearchRequest objects from the Amazon API to perform the operation.
Ti p To access the Amazon server using SOAP, we use the PHP SOAP extension. The documentation of the
PHP SOAP functionality can be found at http://www.php.net/soap/. Consult Appendix A to ensure you have SOAP support enabled in your PHP installation.
To test accessing Web Services using SOAP, create a new file named test_soap.php in your hatshop directory, and write the following code in it: < php try { // Initialize SOAP client object $client = new SoapClient( 'http://webservices.amazon.com/AWSECommerceService/AWSECommerceService.wsdl'); /* DON'T FORGET to replace the string '[Your Access Key ID]' with your subscription ID in the following line */ $request = array ('Service' => 'AWSECommerceService', 'AWSAccessKeyId' => '[Your Access Key ID]', 'Request' => array ('Operation' => 'ItemSearchRequest', 'Keywords' => 'super+hats', 'SearchIndex' => 'Apparel', 'ResponseGroup' => array ('Request', 'Medium'))); $result = $client->ItemSearch($request); echo '<pre>'; print_r($result); echo '</pre>'; } catch (SoapFault $fault) { trigger_error('SOAP Fault: (faultcode: ' . $fault->faultcode . ', ' . 'faultstring: ' . $fault->faultstring . ')', E_USER_ERROR); } >
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