PHP开发中如何处理分布式系统和集群部署

// 发送请求到消息队列
$connection = new AMQPConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();
$channel->queue_declare('task_queue', false, true, false, false);

$msg = new AMQPMessage($request);
$channel->basic_publish($msg, '', 'task_queue');

echo "Request sent to the queue." . PHP_EOL;

$channel->close();
$connection->close();

// 从消息队列中获取请求并处理
$connection = new AMQPConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();
$channel->queue_declare('task_queue', false, true, false, false);

$channel->basic_qos(null, 1, null);
$channel->basic_consume('task_queue', '', false, false, false, false, function($msg) {
    // 处理请求
    echo "Request received: " . $msg->body . PHP_EOL;
    // ...
    $channel->basic_ack($msg->delivery_info['delivery_tag']);
});

while(count($channel->callbacks)) {
    $channel->wait();
}

$channel->close();
$connection->close();

Http {
    upstream backend {
        server 192.168.0.1 weight=3;
        server 192.168.0.2;
        server 192.168.0.3;
    }

    server {
        listen 80;
        server_name example.com;

        location / {
            proxy_pass http://backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }
    }
}

// 设置会话数据
session_set_save_handler(
    new RedisSessionHandler('redis.example.com', 6379),
    true
);

// 获取会话数据
session_set_save_handler(
    new RedisSessionHandler('redis.example.com', 6379),
    true
);

session_start();

echo $_SESSION['user_id'];