How can PHP continuously listen to Redis message subscriptions and send push notifications?

How does PHP continuously listen to Redis message subscriptions and send push notifications?

With the rapid development of the Internet, real-time notifications have become a necessary function for many applications. As a high-performance key-value storage database, Redis's publish and subscribe functions can well meet this demand. This article will introduce how to use PHP to continuously monitor Redis messages and send messages to users through push notifications.

Before you start, you need to make sure that the Redis extension has been installed. You can install it through the following command:

pecl install redis

1. Connect to the Redis server

First, you need Connect to the Redis server. Use the Redis class to connect to the server, and use the Redis::connect method to specify the host and port. The example here uses localhost and the default port 6379:

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

2. Subscribing to messages

Next, you can subscribe using the Redis::subscribe method Messages from one or more channels. This method takes an array as a parameter, which contains the names of all channels to be subscribed to. Here is an example of subscribing to a channel named notifications:

$redis->subscribe(['notifications'], function ($redis, $channel, $message) {
    // 在这里处理收到的消息
});

In the above callback function, the received messages can be processed according to business needs. For example, push notifications can be sent to users.

3. Send push notifications

In order to send push notifications, you can use various third-party push services (such as FCM or APNs) or directly use technologies such as Websocket. Here we take using FCM (Firebase Cloud Messaging) to send push notifications as an example.

Please make sure you have installed the Firebase Admin SDK. It can be installed via Composer:

composer require kreait/firebase-tokens
composer require kreait/firebase-admin

First, import the required classes and initialize the Firebase Admin SDK:

use KreaitFirebaseFactory;
use KreaitFirebaseMessagingCloudMessage;
use KreaitFirebaseMessagingNotification;

$factory = (new Factory)->withServiceAccount('/path/to/serviceAccountKey.json');
$messaging = $factory->createMessaging();

Then, after receiving the message, you can write the code to send the push notification:

$redis->subscribe(['notifications'], function ($redis, $channel, $message) use ($messaging) {
    // 处理收到的消息

    // 构建推送通知
    $notification = Notification::create('标题', '内容');

    // 构建消息
    $message = CloudMessage::fromArray([
        'token' => '设备的推送令牌',
        'notification' => $notification,
    ]);

    // 发送推送通知
    $messaging->send($message);
});

In the above example, the push token of the device needs to be replaced with the push token of the actual device, which can be obtained by referring to the documentation of FCM or APNs.

4. Start monitoring

Finally, call the Redis::subscribe method to start monitoring:

$redis->subscribe(['notifications'], function ($redis, $channel, $message) use ($messaging) {
    // 处理收到的消息

    // 构建推送通知
    $notification = Notification::create('标题', '内容');

    // 构建消息
    $message = CloudMessage::fromArray([
        'token' => '设备的推送令牌',
        'notification' => $notification,
    ]);

    // 发送推送通知
    $messaging->send($message);
});

The above code will continue Listen to the Redis server. When new messages are published to the notifications channel, notifications will be received and push notifications will be sent to users.

Summary

This article introduces how to use PHP to continuously monitor Redis messages and send messages to users through push notifications. By using the publishing and subscribing functions of Redis, real-time notification functions can be realized and the user experience can be improved. At the same time, combined with third-party push services, the push notification function of messages can be easily implemented. Hope this article is helpful to everyone.

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