PHP和MQTT：构建基于事件驱动的实时推荐系统

+----------------------+
|   数据采集模块       |
+----------------------+
         |
         |
+----------------------+
|   数据处理模块       |
+----------------------+
         |
         |
+----------------------+
|   推荐服务模块       |
+----------------------+

pecl install Mosquitto-alpha

<?php
$mqtt = new MosquittoClient();
$mqtt->connect('localhost', 1883, 60); // 连接MQTT服务器

$topic = 'recommendation';
$message = 'Hello, World!';

$mqtt->publish($topic, $message, 1, false); // 发布消息

$mqtt->disconnect(); // 断开连接
?>

<?php
$mqtt = new MosquittoClient();
$mqtt->connect('localhost', 1883, 60); // 连接MQTT服务器

$topic = 'recommendation';

function onMessageReceived($message)
{
    echo "Received message: " . $message . "
";
}

$mqtt->onMessage(function ($message) {
    onMessageReceived($message->payload);
});

$mqtt->subscribe($topic, 0); // 订阅消息

while (!isDone()) {
    $mqtt->loop();
}

$mqtt->disconnect(); // 断开连接

function isDone()
{
    // 根据具体业务逻辑判断是否结束循环
    return false;
}
?>

// 数据采集模块
function collectData()
{
    // 采集用户行为数据，如点击、浏览等
    $data = [];

    return $data;
}

// 数据处理模块
function processData($data)
{
    // 处理数据，并按需求生成推荐结果
    $recommendations = [];

    return $recommendations;
}

// 推荐服务模块
function recommend($userId)
{
    $data = collectData();
    $recommendations = processData($data);

    // 将推荐结果发送给用户
    sendRecommendations($userId, $recommendations);
}

// 发送推荐消息
function sendRecommendations($userId, $recommendations)
{
    $mqtt = new MosquittoClient();
    $mqtt->connect('localhost', 1883, 60);

    $topic = 'recommendations/' . $userId;
    $message = json_encode($recommendations);

    $mqtt->publish($topic, $message, 1, false);

    $mqtt->disconnect();
}

// 示例：用户ID为1的用户获取推荐结果
recommend(1);