library/Rediska/PubSub/Channel.php
public function unsubscribe($channelOrChannels = null)
    {
        if (is_null($channelOrChannels)) {
            $channels = $this->_subscriptions;
        } elseif (!is_array($channelOrChannels)) {
            $channels = array($channelOrChannels);
        } else {
            $channels = $channelOrChannels;
        }

        $this->_execCommand(self::UNSUBSCRIBE, $channels);

        return $this;
    }
public function unsubscribe($channelOrChannels = null)
    {
        if (is_null($channelOrChannels)) {
            $channels = $this->_subscriptions;
        } elseif (!is_array($channelOrChannels)) {
            $channels = array($channelOrChannels);
        } else {
            $channels = $channelOrChannels;
        }

        $this->_execCommand(self::UNSUBSCRIBE, $channels);

        return $this;
    }
Unsubscribe from channel or channels
If $keys is passed - we unsubscribe from all channels

@param string|array[optional] $channelOrChannels
@return Rediska_PubSub_Channel