To get the number of all likes received by a Facebook Page, use the following PHP code. Replace "Google" with the name of the page you want:
$page = "Google";
$url = "http://graph.facebook.com/".$page;
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$raw = curl_exec($ch);
curl_close($ch);
$data = json_decode($raw);
$likes = intval($data->likes);
echo $likes;
If the page has numbers in it, use only the numbers to perform the query. For example, for http://es-es.facebook.com/pages/Podemos/269212336568846, use:
$page = "269212336568846";