foreach ($indexes as $index) {
             if ($index['titles'][DEFAULT_INDEX_TITLE_OFFSET] == $new_index_name) {
                 $error_messages[] = sprintf(_MD_XOONIPS_INDEX_TITLE_CONFLICT, $new_index_name);
                 break 2;
             }
         }
         $index = array();
         $result = xnp_get_index($xnpsid, $xid, $index);
         if ($result != RES_OK) {
             redirect_header(XOOPS_URL . '/index.php', 3, "ERROR");
             exit;
         }
         // register index
         $index['parent_index_id'] = $xid;
         $index['titles'] = array(encodeMacSafari2Server($new_index_name));
         if (xnp_insert_index($xnpsid, $index, $new_xid) == RES_OK) {
             $indexCount++;
             // Record events(insert index)
             $eventlog_handler =& xoonips_getormhandler('xoonips', 'event_log');
             $eventlog_handler->recordInsertIndexEvent($new_xid);
             header('Location: ' . XOOPS_URL . '/modules/xoonips/editindex.php?index_id=' . intval($xid));
         }
     } while (false);
 } else {
     if ($op == 'up' || $op == 'down') {
         // check token ticket
         if (!$xoopsGTicket->check(true, 'xoonips_edit_index')) {
             exit;
         }
         $step = $steps[$updown_xid];
         if ($op == 'up') {
/**
 * Importing indexes to a index that is specified by $parent_index_id.
 * Associations of pseudo ID and Real index ID are sotred to $id_table.
 *
 * @param parent_index_id index_id that indexes is imported to.
 * @param $indexes array of index information to be imported.
 * $indexes = array(
 *                   array( 'titles' => array( TITLE1, TITLE2, ... )
 *                          'parent_id' => pseudo id of parent index
 *                          'item_id' => pseudo id of own index
 *                          'child' => array( [0] => array( 'titles' => ..., 'parent_id' => ..., 'child' => ....)
 *                                            [1] => array( same above ),
 *                                            ....
 *                           )
 *                         ),
 *                   array( 'titles' => array( TITLE1, TITLE2, ... )
 *                          same above ... ),
 *                   ...
 *                   );
 * @param id_table reference of associative array for output( [pseudo id] => [real index id] )
 * @return no return value.
 */
function _xoonips_import_index($parent_index_id, &$indexes, &$id_table)
{
    $xnpsid = $_SESSION['XNPSID'];
    $lengths = xnpGetColumnLengths('xoonips_item_title');
    $unicode =& xoonips_getutility('unicode');
    foreach ($indexes as $index) {
        foreach ($index['titles'] as $k => $title) {
            list($index['titles'][$k], $dummy) = xnpTrimString($unicode->decode_utf8($title, xoonips_get_server_charset(), 'h'), $lengths['title'], 'UTF-8');
        }
        $child = array();
        // numbers of same index name
        $cnt = 0;
        $index_id = 0;
        if (xnp_get_indexes($xnpsid, $parent_index_id, array(), $child) == RES_OK) {
            foreach ($child as $i) {
                $diff = array_diff($i['titles'], $index['titles']);
                if (empty($diff)) {
                    // true if $index have only same names of $i ( $i['titles'] == $index['titles'] )
                    $cnt++;
                    $index_id = $i['item_id'];
                }
            }
        }
        if ($cnt == 1) {
            $id_table[$index['index_id']] = $index_id;
        } else {
            $insert_index = array();
            $insert_index['titles'] = $index['titles'];
            $insert_index['parent_index_id'] = $parent_index_id;
            $result = xnp_insert_index($xnpsid, $insert_index, $index_id);
            if ($result != RES_OK) {
                break;
            }
            $id_table[$index['index_id']] = $index_id;
            // record event log
            $mydirname = basename(dirname(__DIR__));
            $event_handler =& xoonips_getormhandler('xoonips', 'event_log');
            $event_handler->recordInsertIndexEvent($index_id);
        }
        if (array_key_exists('child', $index)) {
            _xoonips_import_index($index_id, $index['child'], $id_table);
        }
    }
}