public function getChannelById($id, $optionalParams = false)
{
$API_URL = $this->getApi('channels.list');
$params = array('id' => $id, 'part' => 'id,snippet,contentDetails,statistics,invideoPromotion');
if ($optionalParams) {
$params = array_merge($params, $optionalParams);
}
$apiData = $this->api_get($API_URL, $params);
return $this->decodeSingle($apiData);
}