/**
* Return only the closed tickets that current user can see (if not member of owner company private
* tickets will be excluded)
*
* @param void
* @return array
*/
function getClosedTickets() {
if (!plugin_active('tickets')) return null;
if(logged_user()->isMemberOfOwnerCompany()) {
return $this->getAllClosedTickets(); // members of owner company can view all tickets
} // if
if(is_null($this->closed_tickets)) {
$this->closed_tickets = ProjectTickets::getClosedProjectTickets($this, false);
} // if
return $this->closed_tickets;
} // getClosedTickets
