Doc #80940 [Com]: async function addFromString work incorrect

Edit report at https://bugs.php.net/bug.php?id=80940&edit=1

 ID:                 80940
 Comment by:         bethsmith45 at aol dot com
 Reported by:        skuratovichalex at gmail dot com
 Summary:            async function addFromString work incorrect
 Status:             Verified
 Type:               Documentation Problem
 Package:            Zip Related
 Operating System:   Debian 9
 PHP Version:        7.4.16
 Block user comment: N
 Private report:     N

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Previous Comments:
------------------------------------------------------------------------
[2023-02-25 06:30:42] jehigej153 at wiroute dot com

(https://www.hebpartner.online/)github.com

------------------------------------------------------------------------
[2022-12-26 10:27:23] janettabloomquist at gmail dot com

Try this: onDeviceReady.then(async function () { await howManyRecords(); console.log("after calling function records are: " + records);}.
(https://www.hebpartnernet.org/)github.com

------------------------------------------------------------------------
[2022-12-10 04:20:40] JonathanLeach at armyspy dot com

In this way, an async function without an await expression will run synchronously. If there is an await expression inside the function body, however, the async function will always complete asynchronously. Code after each await expression can be thought of as existing in a .then callback.

<https://www.aceflareaccount.net/>github.com

------------------------------------------------------------------------
[2021-04-08 10:45:12] [email protected]

> It seems that ZipArchive does not handle the case where the ZIP
> file is modified between calls to open and close.

Actually, ZipArchive does not really touch the ZIP file before
::close() is called.  Only when ::close() is called, the ZIP is
written.  This stems from the underlying libzip which is
implemented this way for performance reasons (adding individual
files to a ZIP archive would be way slower).  Thus, you can't
write to the same archive from multiple process/threads
concurrently, and this is not necessary to improve performance
anyway.

This also implies, that whenever you want to successfully add a
file to an archive, that file needs still to exist when close is
called.

I think this needs to be documented.

------------------------------------------------------------------------
[2021-04-07 19:40:39] [email protected]

As I understand it, you run the test script several times concurrently, everything seems to succeed, except the resulting ZIP file contains less files than expected. This seems like a classic race condition. It seems that ZipArchive does not handle the case where the ZIP file is modified between calls to open and close. Perhaps you can use flock or similar file locking to avoid multiple processes opening the ZIP file at the same time.

------------------------------------------------------------------------


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