AMQPEnvelope::getHeader PHP Méthode

    public function getHeader($header_key)
    {
    }

 protected function processFailedSubscription(\AMQPEnvelope $message)
 {
     $attempt = $message->getHeader('redelivery_counter') ? $message->getHeader('redelivery_counter') : 1;
     if ($attempt < 3) {
         $headers = $message->getHeaders();
         $headers['redelivery_counter'] = ++$attempt;
         $attributes = array_merge($this->messageAttributes, ['content_type' => $message->getContentType(), 'headers' => $headers]);
         $this->getExchange()->publish($message->getBody(), $message->getRoutingKey(), AMQP_NOPARAM, $attributes);
     }
     $this->getQueue()->ack($message->getDeliveryTag());
 }