AMQPEnvelope::getDeliveryTag PHP Method

    public function getDeliveryTag()
    {
    }

 public function getEnvelope()
 {
     if (!$this->envelope) {
         $class = $this->envelope_skeleton;
         $this->envelope = new $class($this->original->getExchangeName(), $this->original->getRoutingKey(), $this->original->getDeliveryTag(), $this->original->isRedelivery());
     }
     return $this->envelope;
 }