amqp_nack.php

<?php

include(__DIR__ . '/config.php');
use PhpAmqpLib\Connection\AMQPConnection;

$exchange = 'router';
$queue = 'msgs';
$consumer_tag = 'consumer';

$conn = new AMQPConnection(HOST, PORT, USER, PASS, VHOST);
$ch = $conn->channel();

$ch->queue_declare($queue, false, true, false, false);
$ch->exchange_declare($exchange, 'direct', false, true, false);
$ch->queue_bind($queue, $exchange);

function process_message($msg)
{
    $msg->delivery_info['channel']->
        basic_nack($msg->delivery_info['delivery_tag']);

    // Send a message with the string "quit" to cancel the consumer.
    if ($msg->body === 'quit') {
        $msg->delivery_info['channel']->
            basic_cancel($msg->delivery_info['consumer_tag']);
    }
}

$ch->basic_consume($queue, $consumer_tag, false, false, false, false, 'process_message');

function shutdown($ch, $conn)
{
    $ch->close();
    $conn->close();
}
register_shutdown_function('shutdown', $ch, $conn);

// Loop as long as the channel has callbacks registered
while (count($ch->callbacks)) {
    $ch->wait();
}