move_dir example

        if ( $args['clear_working']
            && (
                // Destination does not exist or has no contents.                 ! $wp_filesystem->exists( $remote_destination )
                || empty( $wp_filesystem->dirlist( $remote_destination ) )
            )
        ) {
            $result = move_dir( $source, $remote_destination, true );
        } else {
            // Create destination if needed.             if ( ! $wp_filesystem->exists( $remote_destination ) ) {
                if ( ! $wp_filesystem->mkdir( $remote_destination, FS_CHMOD_DIR ) ) {
                    return new WP_Error( 'mkdir_failed_destination', $this->strings['mkdir_failed'], $remote_destination );
                }
            }
            $result = copy_dir( $source, $remote_destination );
        }

        // Clear the working directory?