CommonDBTM::getLogTypeID PHP Method

    function getLogTypeID()
    {
        return array($this->getType(), $this->fields['id']);
    }

 /**
  * Construct  history for an item
  *
  * @param $item               CommonDBTM object
  * @param $oldvalues    array of old values updated
  * @param $values       array of all values of the item
  *
  * @return boolean for success (at least 1 log entry added)
  **/
 static function constructHistory(CommonDBTM $item, &$oldvalues, &$values)
 {
     if (!count($oldvalues)) {
         return false;
     }
     // needed to have  $SEARCHOPTION
     list($real_type, $real_id) = $item->getLogTypeID();
     $searchopt = Search::getOptions($real_type);
     if (!is_array($searchopt)) {
         return false;
     }
     $result = 0;
     // type for which getValueToDisplay() could be used (fully tested)
     $oktype = array('Entity');
     foreach ($oldvalues as $key => $oldval) {
         $changes = array();
         // Parsing $SEARCHOPTION to find changed field
         foreach ($searchopt as $key2 => $val2) {
             if (!is_array($val2)) {
                 // skip sub-title
                 continue;
             }
             // Linkfield or standard field not massive action enable
             if ($val2['linkfield'] == $key || $key == $val2['field'] && $val2['table'] == $item->getTable()) {
                 $id_search_option = $key2;
                 // Give ID of the $SEARCHOPTION
                 if ($val2['table'] == $item->getTable()) {
                     $changes = array($id_search_option, addslashes($oldval), $values[$key]);
                 } else {
                     // other cases ; link field -> get data from dropdown
                     if ($val2["table"] != 'glpi_auth_tables') {
                         $changes = array($id_search_option, addslashes(sprintf(__('%1$s (%2$s)'), Dropdown::getDropdownName($val2["table"], $oldval), $oldval)), addslashes(sprintf(__('%1$s (%2$s)'), Dropdown::getDropdownName($val2["table"], $values[$key]), $values[$key])));
                     }
                 }
                 break;
             }
         }
         if (count($changes)) {
             $result = self::history($real_id, $real_type, $changes);
         }
     }
     return $result;
 }