/**
 * Function to get all relationship type
 * retruns  An array of Relationship_type
 * * @access  public
 */
function civicrm_relationship_types_get($params = null)
{
    _civicrm_initialize();
    require_once 'CRM/Contact/DAO/RelationshipType.php';
    $relationshipTypes = array();
    $relationshipType = array();
    $relationType = new CRM_Contact_DAO_RelationshipType();
    if (!empty($params) && is_array($params)) {
        $properties = array_keys($relationType->fields());
        foreach ($properties as $name) {
            if (array_key_exists($name, $params)) {
                $relationType->{$name} = $params[$name];
            }
        }
    }
    $relationType->find();
    while ($relationType->fetch()) {
        _civicrm_object_to_array(clone $relationType, $relationshipType);
        $relationshipTypes[] = $relationshipType;
    }
    return $relationshipTypes;
}
 /**
  * returns the list of fields that can be exported
  *
  * @access public
  * return array
  */
 function &export($prefix = false)
 {
     if (!$GLOBALS['_CRM_CONTACT_DAO_RELATIONSHIPTYPE']['_export']) {
         $GLOBALS['_CRM_CONTACT_DAO_RELATIONSHIPTYPE']['_export'] = array();
         $fields =& CRM_Contact_DAO_RelationshipType::fields();
         foreach ($fields as $name => $field) {
             if (CRM_Utils_Array::value('export', $field)) {
                 if ($prefix) {
                     $GLOBALS['_CRM_CONTACT_DAO_RELATIONSHIPTYPE']['_export']['relationship_type'] =& $fields[$name];
                 } else {
                     $GLOBALS['_CRM_CONTACT_DAO_RELATIONSHIPTYPE']['_export'][$name] =& $fields[$name];
                 }
             }
         }
     }
     return $GLOBALS['_CRM_CONTACT_DAO_RELATIONSHIPTYPE']['_export'];
 }