PHP ActiveX

Send a POP3 NOOP Command

Demonstrates the Chilkat MailMan.Pop3Noop method, which sends a POP3 NOOP command to the server. NOOP does nothing except elicit a positive response, which is useful for keeping a session alive or verifying the connection is still responsive. This example begins a POP3 session and sends a NOOP.

Background: NOOP ("no operation") is a standard keep-alive across many internet protocols. Servers often drop idle connections after a timeout; sending a periodic NOOP resets that timer so a long-running session stays open. It also serves as a cheap "are you still there?" probe — a successful reply confirms the socket and the authenticated session are still healthy.

Chilkat PHP ActiveX Downloads

Download Chilkat for PHP ActiveX

PHP ActiveX

<?php

$success = 0;

//  Demonstrates the MailMan.Pop3Noop method, which sends a POP3 NOOP command to the server.
//  NOOP does nothing except elicit a positive response, which is useful for keeping a
//  session alive or verifying the connection is still responsive.

$mailman = new COM("Chilkat.MailMan");

//  Configure the POP3 server connection.
$mailman->MailHost = 'pop.example.com';
$mailman->MailPort = 995;
$mailman->PopSsl = 1;
$mailman->PopUsername = 'user@example.com';
$mailman->PopPassword = 'myPassword';

//  Begin a POP3 session.

$success = $mailman->Pop3BeginSession();
if ($success == 0) {
    print $mailman->LastErrorText . "\n";
    exit;
}

//  Send a NOOP to keep the session alive.
$success = $mailman->Pop3Noop();
if ($success == 0) {
    print $mailman->LastErrorText . "\n";
    exit;
}

print 'POP3 NOOP succeeded.' . "\n";

?>