library/Rediska/Zend/Queue/Adapter/Redis.php
public function deleteMessage(Zend_Queue_Message $message)
    {
        $queueName = $this->_queue->getName();

        if (!isset($this->_queueObjects[$queueName])) {
            $this->_queueObjects[$queueName] = new Rediska_Key_List($this->_getKeyName("queue_$queueName"), array('rediska' => $this->_rediska));
        }

        return (boolean)$this->_queueObjects[$queueName]->remove($message->body);
    }
public function deleteMessage(Zend_Queue_Message $message)
    {
        $queueName = $this->_queue->getName();

        if (!isset($this->_queueObjects[$queueName])) {
            $this->_queueObjects[$queueName] = new Rediska_Key_List($this->_getKeyName("queue_$queueName"), array('rediska' => $this->_rediska));
        }

        return (boolean)$this->_queueObjects[$queueName]->remove($message->body);
    }
Delete a message from the queue

Returns true if the message is deleted, false if the deletion is
unsuccessful.

@param  Zend_Queue_Message $message
@return boolean