PHP Service Account Accessing a Google Calendar -

i having trouble trying list events of specific google calender using php. wondering if see working example?
i've looked @ documentation here, isn't working me. if give working example of service account listing events of calender, awesome!

check link spunmonkey.com/display-contents-google-calendar-php . issue google calendar? not able retrieve events in calendar? getting error while retreiving? can try request here developers.google.com/google-apps/calendar/v3/reference/events/…. please post code , error if have any?