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 <sean@iamseanmurphy.com>
 */

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