public static function getAutoStampColumns()
    {
        $auto_stamp = [];
        if (!empty(static::STAMP_COLUMNS)) {
            $stamp_columns = self::normalizeColumnList(static::STAMP_COLUMNS);
            $auto_stamp = array_filter($stamp_columns, function ($mode) {
                return $mode === 'auto';
            });
        }
        return array_keys($auto_stamp);
    }
public static function getAutoStampColumns()
    {
        $auto_stamp = [];
        if (!empty(static::STAMP_COLUMNS)) {
            $stamp_columns = self::normalizeColumnList(static::STAMP_COLUMNS);
            $auto_stamp = array_filter($stamp_columns, function ($mode) {
                return $mode === 'auto';
            });
        }
        return array_keys($auto_stamp);
    }
public static function getAutoStampColumns ( ) { $ auto_stamp = [ ] ; if ( ! empty ( static :: STAMP_COLUMNS ) ) { $ stamp_columns = self :: normalizeColumnList ( static :: STAMP_COLUMNS ) ; $ auto_stamp = array_filter ( $ stamp_columns , function ( $ mode ) { return $ mode === 'auto' ; } ) ; } return array_keys ( $ auto_stamp ) ; }
Returns STAMP_COLUMNS with 'auto' mode

@return string[]
Returns STAMP_COLUMNS with auto mode