PHP A2S Demo 1 - ItemLookup
The following is a simple example of using PHP to perform an A2S ItemLookup
operation and display the information in HTML. It uses functions usually included
in PHP version 4 and later.
<?php
//***********************************************
// PHP A2S Demo 1
//
// A demonstration of one way of receiving and
// displaying information from Amazon's A2S using
// PHP. This demonstrates using A2S's ItemLookup
// operation. The results are parsed using
// the XML functions available in PHP version 4
// and later.
//
// Roger Smith
// a2sdeveloper.com
//***********************************************
//***********************************************
// A method for getting the XML results from
// Amazon.com. This is based on the code at:
// http://www.a2sdeveloper.com/
// page-using-curl-to-get-results-from-ecs.html
// If cURL is not available, this method uses
// the file function to get the results. This
// assumes that fopen wrappers have been enabled.
//***********************************************
function getAmazonPage($url, &$code, &$headers)
{
if (function_exists('curl_exec'))
{
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_USERAGENT, ' Your Name /1.0 (+ http://www. yourdomain.com /)');
curl_setopt ($ch, CURLOPT_HEADER, 1);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt ($ch, CURLOPT_TIMEOUT, 120);
$result = curl_exec ($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$hsize = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
$headers = substr($result, 0, $hsize - 2);
$result = substr($result, $hsize);
curl_close($ch);
return $result;
}
$code = 200;
$headers = "";
$result = implode('', file($url));
}
// Change this to your AWS Access Key
$key = "144RR0T0YM45X6SVKSR2";
// Change this to your Associates Tag if you
// have one
$tag = "oblio-20";
// Change this to the ASIN of the Product to Display
$ASIN = "B0001JXPSO";
// This is the version of A2S we will use. This is
// important because each new release of A2S may
// change the information returned.
$version = "2007-07-16";
// Display the start of the HTML web page. I'm
// using the "heredoc" method, so make sure the
// line "HEADER;" starts in the first column
// of the file.
echo <<<HEADER
<html>
<head>
<title>PHP A2S Demo 1</title>
</head>
<body>
HEADER;
// First we create the URL of the REST query.
$url = "http://ecs.amazonaws.com/onca/xml" .
"?Service=AWSECommerceService" .
"&Version=$version" .
"&Operation=ItemLookup" .
"&SubscriptionId=$key" .
"&AssociateTag=$tag" .
"&ItemId=$ASIN" .
"&IdType=ASIN" .
"&ResponseGroup=Large";
// Next we get the results from A2S
$results = getAmazonPage($url, $code, $headers);
if ($code == 500 || $code == 503)
{
echo "Error getting XML from Amazon.com";
}
else
{
// Create a parser for the XML
$parser = xml_parser_create();
xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING,0);
xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE,1);
xml_parse_into_struct($parser, $results, $values, $tags);
xml_parser_free($parser);
// We now have the XML information in an array
// called $values. We loop through the array
// to process the values.
$inItemAttributes = false;
$inMediumImage = false;
$inEditorialReview = false;
$itemAttributes = array();
foreach ($values as $key=>$val)
{
switch ($val['tag'])
{
case 'DetailPageURL':
$DetailPageURL = $val['value'];
break;
case 'ItemAttributes':
$inItemAttributes = ($val['type'] == 'open');
break;
case 'MediumImage':
$inMediumImage = ($val['type'] == 'open');
break;
case 'EditorialReview':
$inEditorialReview = ($val['type'] == 'open');
break;
case 'Content':
if ($inEditorialReview) $EditorialReview = $val['value'];
break;
case 'URL':
if ($inMediumImage) $MediumImage = $val['value'];
break;
default:
if ($inItemAttributes)
{
$itemAttributes[$val['tag']] = $val['value'];
}
}
}
$Title = $itemAttributes['Title'];
echo "<h1><a href=\"$DetailPageURL\">$Title</a></h1>";
echo "<img src=\"$MediumImage\" align=\"right\">";
echo $EditorialReview;
}
// Display the end of the HTML web page. I'm
// using the "heredoc" method, so make sure the
// line "TRAILER;" starts in the first column
// of the file.
echo <<<TRAILER
<p>
PHP A2S Demo 1 - See: <a href="http://www.a2sdeveloper.com/page-php-examples.html">http://www.a2sdeveloper.com/page-php-examples.html</a>
</body>
TRAILER;
?>
View the output of the above code.
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