API Instagram: Obtener comentarios a las fotos

// 2045xxxx47571864970_10445651699 es el id de la foto

$url = 'https://api.instagram.com/v1/media/2045xxxx47571864970_10445651699/comments?access_token=104xxxx1699.1677ed0.05fd86ae05984a7e97a1152101d57288';
$api_response = file_get_contents($url);
$record = json_decode($api_response);
print_r($record);