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

828 Chapter 33 Connecting to Web Services with XML and SOAP
Listing 33.6 showBrowseNode() Function from bookdisplayfunctions.php—A
List of Categories
// For a particular browsenode, display a page of products
function showBrowseNode($browseNode, $page, $mode) {
$ars = getARS('browse', array('browsenode'=>$browseNode,
'page' => $page, 'mode'=>$mode));
showSummary($ars->products(), $page, $ars->totalResults(),
$mode, $browseNode);
The showBrowseNode() function does exactly two things. First, it calls the getARS()
function from cachefunctions.php.This function gets and returns an
AmazonResultSet object (more on this in a moment).Then it calls the showSummary()
function from bookdisplayfunctions.php to display the retrieved information.
The getARS() function is absolutely key to driving the whole application. If you
work your way through the code for the other actions—viewing details, images, and
searching—you will find that it all comes back to this.
Getting an AmazonResultSet Class
Let’s look at that getARS() function in more detail. It is shown in Listing 33.7.
Listing 33.7 getARS() Function from cachefunctions.php—A Resultset for a
Query
// Get an AmazonResultSet either from cache or a live query
// If a live query add it to the cache
function getARS($type, $parameters) {
$cache = cached($type, $parameters);
if ($cache) {
// if found in cache
return $cache;
} else {
$ars = new AmazonResultSet;
if($type == 'asin') {
$ars->ASINSearch(padASIN($parameters['asin']), $parameters['mode']);
}
if($type == 'browse') {
$ars->browseNodeSearch($parameters['browsenode'],
$parameters['page'], $parameters['mode']);
}
if($type == 'search') {
$ars->keywordSearch($parameters['search'], $parameters['page'],
$parameters['mode']);
}
cache($type, $parameters, $ars);