$fburl="https://feedburner.google.com/api/awareness/1.0/GetFeedData?uri=FEED_ADRESİ";
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $fburl);
$stored = curl_exec($ch);
curl_close($ch);
$grid = new SimpleXMLElement($stored);
$rsscount = $grid->feed->entry['circulation'];
echo $rsscount;
?>
Koddaki FEED_ADRESİ yazan yere http://feeds.feedburner.com/KullanıcıAdı şeklinde feed adresini yaz.