WP_Filesystem_FTPext::chmod( string $file, int|false $mode = false, bool $recursive = false )

	public function chmod($file, $mode = false, $recursive = false) {
		if ( ! $mode ) {
			if ( $this->is_file($file) )
				$mode = FS_CHMOD_FILE;
			elseif ( $this->is_dir($file) )
				$mode = FS_CHMOD_DIR;
			else
				return false;
		}

		// chmod any sub-objects if recursive.
		if ( $recursive && $this->is_dir($file) ) {
			$filelist = $this->dirlist($file);
			foreach ( (array)$filelist as $filename => $filemeta )
				$this->chmod($file . '/' . $filename, $mode, $recursive);
		}

		// chmod the file or directory
		if ( ! function_exists('ftp_chmod') )
			return (bool)@ftp_site($this->link, sprintf('CHMOD %o %s', $mode, $file));
		return (bool)@ftp_chmod($this->link, $mode, $file);
	}