Hi,

I want to add up to this feature/change request.
In particular for ftp functions.

Here is my report and a test script.

I did a few tests with ftp functions:
it would be better for ftp_nlist to return error codes.
Right now the situation is the following :
- with an invalid resource (ftp_nlist(0,'.') for example), it will return NULL
- if you're not loggued in, it will return false
- if you're loggued in, it will return an array
- if you kill the connexion on the server, it will return false
BUT you will not be able to log in again with the same resource.
You have to close the connexion and create a new one with connect.
Moreover, you somehow have two kinds of invalid resources:
- arbitrary doubles,
- killed connexions.

Best regards,
  Laurent Lyaudet

vm3:~# php
<?php
$con = ftp_connect(@myIP@);
ftp_login($con, @myLogin@, @myPassword@);
sleep(11); //kill the ftp process on the server
$test = ftp_login($con, @myLogin@, @myPassword@);
$res = ftp_nlist($con,'./test');
var_dump($res);
var_dump($test);
?>

While touch is a user level function as are the ftp functions, I still think a better error handling is needed.

As of PHP 7.4.0, you could use the FFI extension to access errno.
However, I would not recommend doing so.  The proper way forward
might indeed be some PHP internal improvements, but these would
need to be discussed on the internals mailing list, and might
require the RFC process[1].  So if you're still interested in
this, please start that process.  For the time being, I'm
suspending this ticket.

[1] <https://wiki.php.net/rfc/howto>