How to use Piwik_VisitTime_API

When I use the Piwik_VisitTime_API, for example as following code


$visitInfo = Piwik_VisitTime_API::getInstance()->getVisitInformationPerLocalTime($this->idSite, 'day', 'today');


I don’t know how to analysis the var $visitInfo.

I want to know the structure of $visitInfo.

I need your help.
Thanks.

I personally either :