added todo with url to php class allowing to stream a zip file of arbitrary size

api/src/Vfs.php

@@ -1418,7 +1418,7 @@ class Vfs extends Vfs\StreamWrapper
 	 * @param array $_files List of files to include in the zip
 	 * @param string $name optional Zip file name.  If not provided, it will be determined automatically from the files
 	 *
-	 * @return undefined
+	 * @todo use https://github.com/maennchen/ZipStream-PHP to not assamble all files in memmory
 	 */
 	public static function download_zip(Array $_files, $name = false)
 	{

phpgwapi/inc/class.db_backup.inc.php

@@ -883,6 +883,7 @@ class db_backup
 	 * Backup all data in the form of a (compressed) csv file
 	 *
 	 * @param f resource file opened with fopen for writing
+	 * @todo use https://github.com/maennchen/ZipStream-PHP to not assamble all files in memmory
 	 */
 	function backup($f)
 	{