//with an Organization(CRM-2016)
$membershipTypesResult = civicrm_api3('MembershipType', 'get', array(
'member_of_contact_id' => $this->_contactId,
+ 'options' => array(
+ 'limit' => 0,
+ ),
));
$membershipTypes = CRM_Utils_Array::value('values', $membershipTypesResult, NULL);