public function getPlaylistsByChannelId($channelId, $optionalParams = array())
{
$API_URL = $this->getApi('playlists.list');
$params = array('channelId' => $channelId, 'part' => 'id, snippet, status');
if ($optionalParams) {
$params = array_merge($params, $optionalParams);
}
$apiData = $this->api_get($API_URL, $params);
return $this->decodeList($apiData);
}