PHP中如何处理分布式系统的数据同步？

//连接redis服务器
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

//获取锁
function get_lock($lock_name, $timeout=10) {
    global $redis;
    $uuid = uniqid(); //用唯一标识表示锁
    $lock_key = "lock:{$lock_name}";
    $end = time() + $timeout;
    while (time() < $end) {
        if ($redis->set($lock_key, $uuid, ['NX', 'EX' => $timeout])) {
            return $uuid;
        }
        // 延时等待锁
        usleep(1000);
    }
    return false;
}

//释放锁
function release_lock($lock_name, $uuid) {
    global $redis;
    $lock_key = "lock:{$lock_name}";
    $lock_value = $redis->get($lock_key);
    if ($lock_value === $uuid) {
        $redis->del($lock_key);
    }
}

//获取锁
$uuid = get_lock('some-resource', 5);
if (!$uuid) {
    exit('获取锁失败');
}
//执行业务代码
// ......
//释放锁
release_lock('some-resource', $uuid);

//引入rabbitmq连接类
require_once dirname(__FILE__) . '/vendor/autoload.php';

use PhpAmqpLibConnectionAMQPStreamConnection;
use PhpAmqpLibMessageAMQPMessage;

//连接rabbitmq服务器
$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();
$channel->queue_declare('queue_name', false, true, false, false);

//生产者
function send_msg_to_queue($msg, $queue_name) {
    global $channel;
    $msg = new AMQPMessage($msg, ['delivery_mode' => 2]);
    $channel->basic_publish($msg, '', $queue_name);
}

//消费者
function receive_msg_from_queue($callback, $queue_name) {
    global $channel;
    $channel->basic_consume($queue_name, '', false, true, false, false, $callback);
    while (count($channel->callbacks)) {
        $channel->wait();
    }
}

//消息处理回调函数
function process_msg($msg) {
    echo 'Received message: ' . $msg->body . "
";
}

//使用方法
//发送消息到队列
send_msg_to_queue('hello world!', 'queue_name');
//接收消息
receive_msg_from_queue('process_msg', 'queue_name');