Hprose\Client::unsubscribe PHP Method

    public function unsubscribe($name, $id = null, $callback = null)
    {
        $self = $this;
        if (!is_string($name)) {
            throw new TypeError('topic name must be a string');
        }
        if ($id === null && $callback === null) {
            unset($this->topics[$name]);
            return;
        }
        if (is_callable($id) && !is_callable($callback)) {
            $callback = $id;
            $id = null;
        }
        if ($id === null) {
            if ($this->id === null) {
                if (isset($this->topics[$name])) {
                    $topics = $this->topics[$name];
                    $ids = array_keys($topics);
                    foreach ($ids as $id) {
                        $this->delTopic($topics, $id, $callback);
                    }
                }
            } else {
                $this->id->then(function ($id) use($self, $name, $callback) {
                    $self->unsubscribe($name, $id, $callback);
                });
            }
        } elseif (Future\isFuture($id)) {
            $id->then(function ($id) use($self, $name, $callback) {
                $self->unsubscribe($name, $id, $callback);
            });
        } else {
            $this->delTopic($this->topics[$name], $id, $callback);
        }
        if (isset($this->topics[$name]) && count($this->topics[$name]) === 0) {
            unset($this->topics[$name]);
        }
    }