PHP ActiveX

Send an FTP NOOP (Keep-Alive)

Demonstrates the Chilkat Ftp2.Noop method, which sends the FTP NOOP command. It takes no arguments and succeeds only when the server returns a positive reply.

Background: NOOP asks the server to do nothing and simply reply, which makes it the standard keep-alive: sending one periodically resets the server's idle timer so a long-running job does not lose its control connection between transfers. Because it exercises a real request/reply round trip, a successful NOOP is also firmer evidence the connection is alive than CheckConnection.

Chilkat PHP ActiveX Downloads

Download Chilkat for PHP ActiveX

PHP ActiveX

<?php

$success = 0;

//  Demonstrates the Ftp2.Noop method, which sends the FTP NOOP command.  It takes no arguments.
//  The server must return a positive reply for the method to succeed.

$ftp = new COM("Chilkat.Ftp2");

$ftp->Hostname = 'ftp.example.com';
$ftp->Username = 'myFtpLogin';

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
$ftp->Password = 'myPassword';

//  Connect and log in (Connect performs both).
$success = $ftp->Connect();
if ($success == 0) {
    print $ftp->LastErrorText . "\n";
    exit;
}

//  NOOP does nothing on the server, but a successful reply confirms the control connection is
//  still responsive -- useful as a keep-alive during an otherwise idle session.
$success = $ftp->Noop();
if ($success == 0) {
    print $ftp->LastErrorText . "\n";
    exit;
}

print 'NOOP acknowledged by the server.' . "\n";

$success = $ftp->Disconnect();
if ($success == 0) {
    print $ftp->LastErrorText . "\n";
    exit;
}


?>