How PHP implements real-time notification function and improves the real-time performance of the website

PHP is a widely used open source programming language and has become one of the core technologies of Web development. The real-time notification function is a very important feature in modern websites. It allows the website to respond to user behavior in a timely manner and improves the real-time and interactivity of the website. In this article, we will introduce how to use PHP to implement real-time notification functions and bring a better user experience to the website.

1. Understand the basic principles of real-time notification

Real-time notification means that on the website, when the user performs certain operations, feedback can be sent to the user immediately, such as a pop-up Frame prompts, sound reminders, page updates, etc. The basic principle of realizing real-time notification is to use Web Socket technology, which is a full-duplex communication protocol based on TCP protocol. This protocol can establish a long connection between the browser and the server, so that the server can actively push messages to the browser, so that the function of real-time notification can be realized.

2. Use PHP framework to implement real-time notification function

If you want to add real-time notification function to your website, it is very convenient to use a PHP framework to achieve this Target. There are many popular PHP frameworks on the market, such as Laravel, Yii, CodeIgniter, etc. These frameworks provide very powerful functions, including convenient routing, database operations, template rendering, and components that can access Web Sockets.

When using the PHP framework to implement the real-time notification function, you need to follow the following steps:

Step 1: Use Composer to install the Web Socket component of the framework

You can use Composer to install The Web Socket component of the framework can reduce many tedious operations. When using Composer, you need to create a composer.json file in the project folder and add the following code to the file:

{

"require": {
    "cboden/ratchet": "0.4.*"
}

}

Then in In the terminal or command line, enter the project folder and execute the composer install command, and wait for the installation of dependent packages to complete.

Step 2: Create a Web Socket server program

When using the PHP framework, creating a Web Socket server program is very simple. Just add a new route in the framework's routing file to handle Web Socket connection requests. For example, in the CodeIgniter framework, you can add the following code to the routes.php file:

$route['websocket'] = 'WebSocket_controller';

Then create a WebSocket in the controller Class, inherits from the AppWebSocketWsServer class in the Ratchet library, and overrides the onMessage() method in the class. This method will be called when the server receives the message sent by the client. The logic of the server actively sending messages to the client can be implemented in this method, as shown below:

use RatchetConnectionInterface;
use RatchetMessageComponentInterface;

class WebSocket_controller extends CI_Controller implements MessageComponentInterface {

private $clients = array();

public function __construct() {
    parent::__construct();
}

public function index() {
    $server = RatchetserverIoServer::factory(
        new RatchetHttpHttpServer(
            new RatchetWebSocketWsServer(
                $this
            )
        ),
        8080
    );
    $server->run();
}

public function onOpen(ConnectionInterface $conn) {
    $id = $conn->resourceId;
    $this->clients[$id] = $conn;
    echo "New connection {$id}

";

}

public function onClose(ConnectionInterface $conn) {
    $id = $conn->resourceId;
    unset($this->clients[$id]);
    echo "Connection {$id} has disconnected

";

}

public function onError(ConnectionInterface $conn, Exception $e) {
    echo "An error has occurred: {$e->getMessage()}

";

    $conn->close();
}

public function onMessage(ConnectionInterface $from, $msg) {
    foreach ($this->clients as $client) {
        if ($from !== $client) {
            $client->send($msg);
        }
    }
}

}

Step 3: Create a connection between client and server Web Socket connection

In JavaScript, you can use the WebSocket object to create a Web Socket connection. By connecting to the server, you can receive real-time messages pushed by the server. For example, in JavaScript, you can create a WebSocket object, As shown below:

var ws = new WebSocket("ws://localhost:8080/websocket");

Then you can add an onmessage event listener to the WebSocket object. When the server When a message is sent, the listener will be called as follows:

ws.onmessage = function(event) {

console.log("Received message: " + event.data);

}

3. Summary

By using the Web Socket component provided in the PHP framework, you can easily add a real-time notification function to the website. This function can significantly improve the real-time and interactivity of the website, and enhance user experience and satisfaction degree. There are many details to pay attention to when implementing a Web Socket connection, and to choose the right library for the communication protocol. But once set up, the real-time communication capabilities between the server and the client will greatly enhance your website and provide you with Provide users with a better user experience.

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