getRoutingKeyForDelay example

    private function publishWithDelay(string $body, array $headers, int $delay, AmqpStamp $amqpStamp = null): void
    {
        $routingKey = $this->getRoutingKeyForMessage($amqpStamp);
        $isRetryAttempt = $amqpStamp ? $amqpStamp->isRetryAttempt() : false;

        $this->setupDelay($delay, $routingKey, $isRetryAttempt);

        $this->publishOnExchange(
            $this->getDelayExchange(),
            $body,
            $this->getRoutingKeyForDelay($delay, $routingKey, $isRetryAttempt),
            $headers,
            $amqpStamp
        );
    }

    private function publishOnExchange(\AMQPExchange $exchange, string $body, string $routingKey = null, array $headers = [], AmqpStamp $amqpStamp = null): void
    {
        $attributes = $amqpStamp ? $amqpStamp->getAttributes() : [];
        $attributes['headers'] = array_merge($attributes['headers'] ?? [], $headers);
        $attributes['delivery_mode'] ??= 2;
        $attributes['timestamp'] ??= time();