Scrape ratings from iTunes store

podcast-ratings.php

<?php
/**
 * Scrape the number of podcast reviews from iTunes for all country specific storefronts.
 *
 * @author Sean Murphy <[email protected]>
 */

$podcast_id = '366931951';	// Startups For the Rest of Us
//$podcast_id = '318567721';	// techzing

$countries = json_decode('[{"storefront":"143455-6,12","name":"Canada"},{"storefront":"143441-1,12","name":"United States"},{"storefront":"143565,12","name":"Belarus"},{"storefront":"143446-2,12","name":"Belgium"},{"storefront":"143526,12","name":"Bulgaria"},{"storefront":"143494,12","name":"Croatia"},{"storefront":"143557-2,12","name":"Cyprus"},{"storefront":"143489,12","name":"Czech Republic"},{"storefront":"143458-2,12","name":"Denmark"},{"storefront":"143443,12","name":"Deutschland"},{"storefront":"143454-8,12","name":"España"},{"storefront":"143518,12","name":"Estonia"},{"storefront":"143447-2,12","name":"Finland"},{"storefront":"143442,12","name":"France"},{"storefront":"143448,12","name":"Greece"},{"storefront":"143482,12","name":"Hungary"},{"storefront":"143558,12","name":"Iceland"},{"storefront":"143449,12","name":"Ireland"},{"storefront":"143450,12","name":"Italia"},{"storefront":"143519,12","name":"Latvia"},{"storefront":"143520,12","name":"Lithuania"},{"storefront":"143451-2,12","name":"Luxembourg"},{"storefront":"143530,12","name":"Macedonia"},{"storefront":"143521,12","name":"Malta"},{"storefront":"143523,12","name":"Moldova"},{"storefront":"143452,12","name":"Nederland"},{"storefront":"143457-2,12","name":"Norway"},{"storefront":"143445,12","name":"Österreich"},{"storefront":"143478,12","name":"Poland"},{"storefront":"143453,12","name":"Portugal"},{"storefront":"143487,12","name":"Romania"},{"storefront":"143496,12","name":"Slovakia"},{"storefront":"143499,12","name":"Slovenia"},{"storefront":"143456,12","name":"Sverige"},{"storefront":"143459-2,12","name":"Switzerland"},{"storefront":"143480,12","name":"Turkey"},{"storefront":"143444,12","name":"United Kingdom"},{"storefront":"143469,12","name":"Россия"},{"storefront":"143563,12","name":"Algeria"},{"storefront":"143564,12","name":"Angola"},{"storefront":"143524,12","name":"Armenia"},{"storefront":"143568,12","name":"Azerbaijan"},{"storefront":"143559,12","name":"Bahrain"},{"storefront":"143525,12","name":"Botswana"},{"storefront":"143516,12","name":"Egypt"},{"storefront":"143573,12","name":"Ghana"},{"storefront":"143467,12","name":"India"},{"storefront":"143491,12","name":"Israel"},{"storefront":"143528,12","name":"Jordan"},{"storefront":"143529,12","name":"Kenya"},{"storefront":"143493,12","name":"Kuwait"},{"storefront":"143497,12","name":"Lebanon"},{"storefront":"143531,12","name":"Madagascar"},{"storefront":"143532,12","name":"Mali"},{"storefront":"143533,12","name":"Mauritius"},{"storefront":"143534,12","name":"Niger"},{"storefront":"143561,12","name":"Nigeria"},{"storefront":"143562,12","name":"Oman"},{"storefront":"143498,12","name":"Qatar"},{"storefront":"143479,12","name":"Saudi Arabia"},{"storefront":"143535,12","name":"Senegal"},{"storefront":"143472,12","name":"South Africa"},{"storefront":"143572,12","name":"Tanzania"},{"storefront":"143536,12","name":"Tunisia"},{"storefront":"143481,12","name":"UAE"},{"storefront":"143537,12","name":"Uganda"},{"storefront":"143571,12","name":"Yemen"},{"storefront":"143460,12","name":"Australia"},{"storefront":"143560,12","name":"Brunei Darussalam"},{"storefront":"143465-2,12","name":"China"},{"storefront":"143463,12","name":"Hong Kong"},{"storefront":"143476,12","name":"Indonesia"},{"storefront":"143462-1,12","name":"Japan"},{"storefront":"143517,12","name":"Kazakhstan"},{"storefront":"143515,12","name":"Macau"},{"storefront":"143473,12","name":"Malaysia"},{"storefront":"143461,12","name":"New Zealand"},{"storefront":"143477,12","name":"Pakistan"},{"storefront":"143474,12","name":"Philippines"},{"storefront":"143464,12","name":"Singapore"},{"storefront":"143486,12","name":"Sri Lanka"},{"storefront":"143470,12","name":"Taiwan"},{"storefront":"143475,12","name":"Thailand"},{"storefront":"143566,12","name":"Uzbekistan"},{"storefront":"143471,12","name":"Vietnam"},{"storefront":"143466,12","name":"대한민국"},{"storefront":"143538,12","name":"Anguilla"},{"storefront":"143540,12","name":"Antigua and Barbuda"},{"storefront":"143505-2,12","name":"Argentina"},{"storefront":"143539,12","name":"Bahamas"},{"storefront":"143541,12","name":"Barbados"},{"storefront":"143555-2,12","name":"Belize"},{"storefront":"143542,12","name":"Bermuda"},{"storefront":"143556-2,12","name":"Bolivia"},{"storefront":"143503,12","name":"Brasil"},{"storefront":"143543,12","name":"British Virgin Islands"},{"storefront":"143544,12","name":"Cayman Islands"},{"storefront":"143483-2,12","name":"Chile"},{"storefront":"143501-2,12","name":"Colombia"},{"storefront":"143495-2,12","name":"Costa Rica"},{"storefront":"143545,12","name":"Dominica"},{"storefront":"143508-2,12","name":"Dominican Republic"},{"storefront":"143509-2,12","name":"Ecuador"},{"storefront":"143506-2,12","name":"El Salvador"},{"storefront":"143546,12","name":"Grenada"},{"storefront":"143504-2,12","name":"Guatemala"},{"storefront":"143553,12","name":"Guyana"},{"storefront":"143510-2,12","name":"Honduras"},{"storefront":"143511,12","name":"Jamaica"},{"storefront":"143468,12","name":"México"},{"storefront":"143547,12","name":"Montserrat"},{"storefront":"143512-2,12","name":"Nicaragua"},{"storefront":"143485-2,12","name":"Panama"},{"storefront":"143513-2,12","name":"Paraguay"},{"storefront":"143507-2,12","name":"Peru"},{"storefront":"143548,12","name":"St. Kitts and Nevis"},{"storefront":"143549,12","name":"St. Lucia"},{"storefront":"143550,12","name":"St. Vincent & The Grenadines"},{"storefront":"143554-2,12","name":"Suriname"},{"storefront":"143551,12","name":"Trinidad and Tobago"},{"storefront":"143552,12","name":"Turks & Caicos"},{"storefront":"143514-2,12","name":"Uruguay"},{"storefront":"143502-2,12","name":"Venezuela"}]');

$ratings = array();

foreach ($countries as $country) {
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, "http://itunes.apple.com/WebObjects/MZStore.woa/wa/customerReviews?displayable-kind=4&id={$podcast_id}");
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
	curl_setopt($ch, CURLOPT_HTTPHEADER, array(
		'User-Agent: iTunes/10.3.1 (Macintosh; Intel Mac OS X 10.6.8) AppleWebKit/533.21.1',
		"X-Apple-Store-Front: {$country->storefront}",
		'X-Apple-Tz: -18000',
		'Accept-Language: en-us, en;q=0.50',
	));
	$body = curl_exec($ch);
	curl_close($ch);

	$dom = new DOMDocument();
	@$dom->loadHTML($body);

	$xpath = new DOMXPath($dom);
	$nodes = $xpath->query("//span[@class='rating-count']");
	
	if ($nodes->item(0)) {
		$ratings[$country->name] = (int)preg_replace('/([\d]+)/', '$1', $nodes->item(0)->nodeValue);
	} else {
		$ratings[$country->name] = 0;
	}
}
?>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<table>
	<thead>
		<tr>
			<th>Country</th>
			<th>Ratings</th>
		</tr>
	</thead>
	<tbody>
	<?php
	foreach ($ratings as $country => $count) {
		if ($count) {
			echo "<tr><td>{$country}</td><td>{$count}</td></tr>\n";
		}
	}
	?>
	</tbody>
	<tfoot>
		<tr>
			<td><strong>TOTAL</strong></td>
			<td><strong><?php echo array_sum($ratings); ?></strong></td>
		</tr>
	</tfoot>
</table>
</body>

@SM09E thanks for your list of language mapping. I just test the third value, the result is:
42 Mac1
41 MacTV1
40 MacAMPLibrary1
39 MacMusic1
38 MacPodcasts1
34 Configurator
32 iTunes122
30 K84
29 P84
28 iTunes12
26 P8
25 K8
24 P71
23 K71
21 P7
20 K7
17 iTunes11
16 P6
15 K6
14 EnterpriseStore
12 iTunes10
11 VolumeStore

The way I tested the third part of the value is :

1. Find the api with the platformname value in the response data，what i used is application info api: https://apps.apple.com/{country code}/app/{app name}/id{appid}
2. Change the third value, and send the request
3. find the platformname value in response data

Test range is 0-50, But I only got a partially determined value。I think this has something to do with the country. But i just has two account.
So i want to know, if you have any progress since then?