require 'vkapi.class.php';
$api_id = XXXXXX;
$secret_key = 'YYYYYYYYYYYYYYY';
$VK = new vkapi($api_id, $secret_key);
$resp = $VK->api('likes.getList', array(
'type'=>'sitepage', 'item_id'=>'http://example.com/cat/page1.html', 'page_url' => 'http://example.com/cat/page1.html'
));
print_r($resp);