trying to get a list of events from a calendar using PHP

I am trying to get a list of events from a calendar.
i am looking at google doc but i can not show the URL i am using in this post

I assume that $service is created from $cal = new apiCalendarService($client); The doc is not very specific.

when i try to execute the code below , i get the error
PHP Fatal error: Call to a member function getItems() on a non-object

but if i do this it works
$calendarList = $cal->calendarList->listCalendarList();
print "<h1>Calendar List</h1><pre>" . print_r($calendarList, true) . "</pre>";

Also if i try the example code @
i am looking at google doc but i can not show the URL i am using in this post

I get the same kind of error
PHP Fatal error: Call to a member function getItems() on a non-object

This works:

 $events = $cal->events->listEvents('rtparies@gmail.com');    print "<h1>Events</h1><pre>" . print_r($events, true) . "</pre>";

PHP:

This fails:

foreach($events->getItems()as $event){
    echo $event->getSummary();
  }

PHP:

I can not imagine all these examples are bad, so any suggestions on what i am doing wrong?

The example is below :

$calendarList = $service->calendarList->listCalendarList();
while(true){
  foreach($calendarList->getItems()as $calendarListEntry){
    echo $calendarListEntry->getSummary();
  }
  $pageToken = $calendarList->getNextPageToken();
  if($pageToken){
    $optParams = array('pageToken'=> $pageToken);
    $calendarList = $service->calendarList->listCalendarList($optParams);
  }else{
    break;
  }
}

PHP: