protected static function formatGroupSuffix(array $new, array $old): ?string
    {
        $oldSuffix = $old['suffix'] ?? null;

        if (isset($new['suffix'])) {
            return \trim($new['suffix']) . \trim($oldSuffix);
        }

        return $oldSuffix;
    }
protected static function formatGroupSuffix(array $new, array $old): ?string
    {
        $oldSuffix = $old['suffix'] ?? null;

        if (isset($new['suffix'])) {
            return \trim($new['suffix']) . \trim($oldSuffix);
        }

        return $oldSuffix;
    }
protected static function formatGroupSuffix ( array $ new , array $ old ) : ? string { $ oldSuffix = $ old [ 'suffix' ] ?? null ; if ( isset ( $ new [ 'suffix' ] ) ) { return \ trim ( $ new [ 'suffix' ] ) . \ trim ( $ oldSuffix ) ; } return $ oldSuffix ; }
Format the suffix for the new group attributes.

@param array $new
@param array $old

@return null|string
Format the suffix for the new group attributes .