Service discovery over Majordomo in PHP

<?php
/*
* MMI echo query example
*
* @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
*/

include 'mdcliapi.php';

$verbose = $_SERVER['argc'] > 1 && $_SERVER['argv'][1] == '-v';
$session = new MDCli("tcp://localhost:5555", $verbose);

// This is the service we want to look up
$request = new Zmsg();
$request->body_set("echo");

// This is the service we send our request to
$reply = $session->send("mmi.service", $request);

if ($reply) {
$reply_code = $reply->pop();
printf ("Lookup echo service: %s %s", $reply_code, PHP_EOL);
}