PHP

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.

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<?php

use Chilkat2\Ftp2;

// 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 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).
try {
    $ftp->Connect();

    // 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.
    $ftp->Noop();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "NOOP acknowledged by the server.\n";

try {
    $ftp->Disconnect();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}