How to identify a problem with an FTP upload?

Question

PHP

Good afternoon, the second day I toil with a problem - there is a server (file hosting) to which I can upload only via FTP. Everything seems to be nothing, there is a working script that, in the decodarray array cycle, logs in to the server, uploads the file and disconnects.

$file_name  = '/var/www/www-root/data/www/domain.com/images/'.trim($decodarray[$i]['fname']);
$ftp_file    = trim($decodarray[$i]['fname']);

$ftp = ftp_connect($ftp_server, $ftp_port, 20);
ftp_login($ftp, $ftp_user_name, $ftp_user_pass);

ftp_pasv($ftp, true); 
if(!ftp_fput($ftp, $ftp_file, $file_name, FTP_BINARY)){
 echo "ERROR";
}
ftp_close($ftp);

The script has been tested many times, but on this server it works somehow strangely - it only uploads 30% of all files. At the same time, there is no dependence on the file size - it gives an error both for small (20Mb) and for files up to 1gigabyte. Due to the fact that the function only returns true or false, I can’t understand the reason and fix it. What are the options for solving the problem?
And, yes, ... in the logs, of course, everything is clean :( I
ran it under SSH. and oh, miracle ....
when there are no messages, the file is poured, and when the warning " PHP Warning: ftp_put(): type set ." or " PHP Warning: ftp_put(): Opening ASCII mode data connection " then the file is not being uploaded. what's the nonsense? The transfer type is set explicitly. how can it change in asks?

Answer 1

use Kurl,
especially imbued with his timebars