(PHP 4 >= 4.3.0, PHP 5)
ftp_nb_put — Stores a file on the FTP server (non-blocking)
$ftp_stream
   , string $remote_file
   , string $local_file
   , int $mode
   [, int $startpos = 0
  ] )ftp_nb_put() stores a local file on the FTP server.
The difference between this function and the ftp_put() is that this function uploads the file asynchronously, so your program can perform other operations while the file is being uploaded.
ftp_stream
     The link identifier of the FTP connection.
remote_file
     The remote file path.
local_file
     The local file path.
mode
     
       The transfer mode. Must be either FTP_ASCII or
       FTP_BINARY.
      
startpos
     The position in the remote file to start uploading to.
   Returns FTP_FAILED or FTP_FINISHED
   or FTP_MOREDATA.
  
Example #1 ftp_nb_put() example
<?php
// Initiate the Upload
$ret = ftp_nb_put($my_connection, "test.remote", "test.local", FTP_BINARY);
while ($ret == FTP_MOREDATA) {
   
   // Do whatever you want
   echo ".";
   // Continue uploading...
   $ret = ftp_nb_continue($my_connection);
}
if ($ret != FTP_FINISHED) {
   echo "There was an error uploading the file...";
   exit(1);
}
?>
Example #2 Resuming an upload with ftp_nb_put()
<?php
// Initiate
$ret = ftp_nb_put($my_connection, "test.remote", "test.local", 
                      FTP_BINARY, ftp_size("test.remote"));
// OR: $ret = ftp_nb_put($my_connection, "test.remote", "test.local", 
//                           FTP_BINARY, FTP_AUTORESUME);
while ($ret == FTP_MOREDATA) {
   
   // Do whatever you want
   echo ".";
   // Continue uploading...
   $ret = ftp_nb_continue($my_connection);
}
if ($ret != FTP_FINISHED) {
   echo "There was an error uploading the file...";
   exit(1);
}
?>