PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Solution Overview
829
Listing 33.7
}
return $ars;
}
Continued
This function is designed to drive the process of getting data from Amazon. It can do
this in two ways: either from the cache or live from Amazon. Because Amazon requires
developers to cache downloaded data, the function first looks for data in the cache.We
discuss the cache shortly.
If you have not already performed this particular query, the data must be fetched live
from Amazon.You do this by creating an instance of the AmazonResultSet class and calling
the method on it that corresponds to the particular query you want to run.The type
of query is determined by the $type parameter. In the category (or browse node) search
example, you pass in browse as the value for this parameter (refer to Listing 33.6). If you
want to perform a query about one particular book, you should pass in the value asin,
and if you want to perform a keyword search, you should set the parameter to search.
Each of these parameters invokes a different method on the AmazonResultSet class.
The individual item search calls the ASINSearch() method.The category search calls the
browseNodeSearch() method.The keyword search calls the keywordSearch() method.
Let’s take a closer look at the AmazonResultSet class.The full code for this class is
shown in Listing 33.8.
Listing 33.8
AmazonResultSet.php—A Class for Handling Amazon Connections