function list_dm($page = 1, $count = 50, $since_id = 0, $max_id = 0)
{
$params = array();
if ($since_id) {
$this->id_format($since_id);
$params['since_id'] = $since_id;
}
if ($max_id) {
$this->id_format($max_id);
$params['max_id'] = $max_id;
}
return $this->request_with_pager('direct_messages', $page, $count, $params);
}