Hello World server in PHP

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<?php
/*
* Hello World server
* Binds REP socket to tcp://*:5555
* Expects "Hello" from client, replies with "World"
* @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
*/

$context = new ZMQContext(1);

// Socket to talk to clients
$responder = new ZMQSocket($context, ZMQ::SOCKET_REP);
$responder->bind("tcp://*:5555");

while(true) {
// Wait for next request from client
$request = $responder->recv();
printf ("Received request: [%s]\n", $request);

// Do some 'work'
sleep (1);

// Send reply back to client
$responder->send("World");
}