PHP ftp_nb_continue() Function

The PHP ftp_nb_continue() function continues retrieving/sending a file non-blocking to the FTP server.

Syntax

ftp_nb_continue(ftp)

Parameters

ftp Required. Specify the FTP connection to use.

Return Value

Returns any of the following values:

FTP_FAILED: Asynchronous transfer has failed.
FTP_FINISHED: Asynchronous transfer has finished.
FTP_MOREDATA: Asynchronous transfer is still active.

Example:

The example below shows the usage of ftp_nb_continue() function.

<?php
//FTP server to use
$ftp_server = "ftp.example.com";
  
//username for the FTP Connection
$ftp_user = "user";
  
//password for the user
$ftp_pass = "password";
  
//set up a connection or die 
$ftp = ftp_connect($ftp_server)
    or die("Could not connect to $ftp_server");
   
if($ftp) {
  echo "Successfully connected to $ftp_server!\n";
 
  //trying to login
  if(@ftp_login($ftp, $ftp_user, $ftp_pass)) {
    echo "Connected as $ftp_user@$ftp_server\n";
      
    //initiating the download
    $ret = ftp_nb_continue($ftp, "local_demo.txt", 
                    "server_demo.txt", FTP_ASCII);

    while ($ret == FTP_MOREDATA) {
      //continue downloading...
      $ret = ftp_nb_continue($ftp);
    }

    if ($ret == FTP_FINISHED) {
      echo "Successfully downloaded the file\n";
    } else {
      echo "Error while downloading the file\n";
      exit(1);
    }
    
  } else {
    echo "Couldn't connect as $ftp_user\n";
  }
 
  //close the connection
  if(ftp_close($ftp)) {
    echo "Connection closed successfully!\n"; 
  } 
}
?>

The output of the above code will be:

Successfully connected to ftp.example.com!
Connected as user@ftp.example.com
Successfully downloaded the file
Connection closed successfully!

❮ PHP FTP Reference