library/Rediska/PubSub/Channel.php
public function offsetSet($offset, $value)
    {
        if (!is_null($offset)) {
            throw new Rediska_PubSub_Exception('Offset is not allowed in Rediska_PubSub_Channel');
        }

        $this->publish($value);

        return $value;
    }
public function offsetSet($offset, $value)
    {
        if (!is_null($offset)) {
            throw new Rediska_PubSub_Exception('Offset is not allowed in Rediska_PubSub_Channel');
        }

        $this->publish($value);

        return $value;
    }
/* ArrayAccess implementation