src/pubcontrol.php
public function publish($channel, $item)
    {
        foreach ($this->clients as $client)
            $client->publish($channel, $item);
    }
public function publish($channel, $item)
    {
        foreach ($this->clients as $client)
            $client->publish($channel, $item);
    }
specified channel for all of the configured PubControlClient instances.