Ratchet WAMP $topic error:Call to a member function broadcast() on a non-object - wamp

Question

The title says it all.Here's my code:
(Shell script)
$loop = React\EventLoop\Factory::create();
$pusher = new MyApp\Chat;
//Receiving IPC messages:
$socket = new React\Socket\Server($loop);
$socket->on('connection', function ($conn) {
$pusher = new MyApp\Chat;
echo date('H:i:s'). "!!IPC Connection opened!!\n";
$conn->on('data', array($pusher, 'onUpdate'));
});
$socket->listen(1337, '127.0.0.1'); //Binding to our IP so remotes can't connect.
echo "%%% IPC listener started succesfully. %%%\n%%%\n";
// WebSocket server:
//here the code is identical to that on the Ratchet 'push-server' tutorial
...and the "onUpdate" function...
public function onUpdate($entry)
{
echo(date('H:i:s'). ": !<<---IPC Data Received.DATA:::". $entry. ":::--->>!\n");
$topic = 'Prime_mover';
$topic->broadcast($entry);
}
...the "onPublish" function:
public function onPublish(Conn $conn, $topic, $event, array $exclude, array $eligible )
{
echo $topic. "\n";
//echo implode(array_keys($topic)). "\n";
$channel = $topic->getId();
if($topic->broadcast($event))
{
echo(date('H:i:s') . ": ***A client has published ###" .
implode('', $event) . "### to (((". $channel. ")))***\n");
} else {
echo(date('H:i:s'). ": !!<--An error occured during publish-->!!\n");
}
}
The client code is trivial.
I am sure the bug, if any (I've been at this for about 10 hours), does not reside there.
I confirm via the console that indeed the browser is subscribed to "Prime_mover". This also shows up on the CLI. In addition, I have put a button that publishes to this channel, via the "onPublish" function. This works.
As can be seen above, I am not using ZeroiMQ for IPC because I am developing on a windows machine, on PHP 5. AFAIK, there exists no working ZeroMQ bindings for PHP5.
I resorted to using bare sockets. They work just as beautifully, and I can see on the CLI that the messages do get to this particular script.
The "onUpdate" function does get called, confirmed, again, via the CLI.
I had previously tried using the URL "http:\example.com\Prime_mover", when it did not work, out of desperation, I tried the string "Prime_mover". You're probably shaking your head right now-I know, does't work that way.
I have tried to use $topica as an array too, does not work.I guess the most important question here is, what kind of object is $topic, why won't a simple string work in it's place?Am I missing something here?How is it "constructed" correctly?

Answer 1

$topic = 'Prime_mover';
$topic->broadcast($entry);
$topic is a string! And it doesn't have any methods.