amqp_delay_via_dead_queue.php

<?php
/** 
 * @var \Enqueue\AmqpExt\AmqpMessage $message
 * @var \Enqueue\AmqpExt\AmqpContext $context
 * @var \Enqueue\AmqpExt\AmqpConsumer $consumer 
 */

if ($message->isRedelivered()) {
    $retryQueue = $context->createQueue('a_retry_queue');
    $retryQueue->addFlag(AMQP_DURABLE);
    $retryQueue->setArguments([
        'x-dead-letter-exchange' => '',
        'x-dead-letter-routing-key' => 'a_queue',
        'x-message-ttl' => 5000, // 5 sec
    ]);
    $context->declareQueue($retryQueue);
    
    $retryMessage = $context->createMessage(
        $message->getBody(),
        $message->getProperties(), 
        $message->getHeaders()
    );

    $context->createProducer()->send($retryQueue, $retryMessage);
    
    $consumer->acknowledge($message);   
}