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Use php to develop Websocket to create real-time logistics tracking function

王林

Dec 18, 2023 pm 03:39 PM

phpwebsocketLogistics tracking

Use php to develop Websocket to create real-time logistics tracking function

Use PHP to develop WebSocket to create real-time logistics tracking function

Introduction:
With the development of the logistics industry, real-time tracking of cargo status has become an important requirement. In the past, the polling-based method to obtain cargo information could not meet the real-time requirements. Using WebSocket technology, the server can actively push data to the client and provide real-time logistics tracking functions.

This article will introduce how to use PHP to develop WebSocket and provide specific code examples to implement real-time logistics tracking functions.

Introduction to WebSocket
WebSocket is a protocol for full-duplex communication over a single TCP connection. It implements real-time data push from server to client by maintaining a persistent connection. Compared with traditional HTTP requests, WebSocket is more suitable for application scenarios with high real-time requirements.
PHP Development WebSocket
In PHP, we can use the Ratchet library to implement the WebSocket function. Ratchet is a PHP-based WebSocket library that provides an interface for easily developing WebSocket servers.

First, we need to introduce the Ratchet library into the project. You can manage project dependencies through Composer. Use the following command to install the Ratchet library:

composer require cboden/ratchet

Next, we create an entry file for the WebSocket server, such as server.php:

<?php
require 'vendor/autoload.php';

use RatchetMessageComponentInterface;
use RatchetConnectionInterface;
use RatchetServerIoServer;
use RatchetHttpHttpServer;
use RatchetWebSocketWsServer;

class MyWebSocketApp implements MessageComponentInterface
{
    protected $clients;

    public function __construct()
    {
        $this->clients = new SplObjectStorage;
    }

    public function onOpen(ConnectionInterface $conn)
    {
        $this->clients->attach($conn);
    }

    public function onMessage(ConnectionInterface $from, $msg)
    {
        // 处理收到的消息，更新物流信息等
        // 然后向所有客户端主动推送最新的物流信息
        foreach ($this->clients as $client) {
            $client->send($msg);
        }
    }

    public function onClose(ConnectionInterface $conn)
    {
        $this->clients->detach($conn);
    }

    public function onError(ConnectionInterface $conn, Exception $e)
    {
        $conn->close();
    }
}

$server = IoServer::factory(
    new HttpServer(
        new WsServer(
            new MyWebSocketApp()
        )
    ),
    8080
);

$server->run();

In the above code , we created a class called MyWebSocketApp that implements Ratchet's MessageComponentInterface interface. This interface defines the basic operation callback functions of the WebSocket server, including onOpen, onMessage, onClose, onError, etc.

In the onOpen callback function, we add the new client connection to the $clients object storage. When a message is received, in the onMessage callback function, we can process the received message, such as updating logistics information, etc., and traverse all clients through a foreach loop to actively push the latest logistics information to the client.

Finally, create a WebSocket server instance using the IoServer class, specify the listening port number, and use the run method to start the server.

Client implementation
On the client side, we can use the browser's built-in WebSocket API to communicate with the WebSocket server.

<!DOCTYPE html>
<html>
<head>
<script>
var ws = new WebSocket("ws://localhost:8080");

ws.onopen = function() {
    console.log("Socket连接已打开");
};

ws.onmessage = function(evt) {
    // 处理接收到的物流信息，并在页面上进行展示
    var message = evt.data;
    console.log("收到消息：" + message);
    // ...
};

ws.onclose = function() {
    console.log("Socket连接已关闭");
};

</script>
</head>
<body>
</body>
</html>

In the above code, we create a WebSocket object and specify the address and port of the WebSocket server. We can then handle interaction with the server through callback functions such as onopen, onmessage, and onclose.

When the WebSocket connection is successfully established, the onopen callback function will be triggered, and we can perform related operations here. When a message pushed by the server is received, the onmessage callback function will be triggered, where we can process the received logistics information and display it on the page. When the connection is closed, the onclose callback function will be triggered.

Logistics tracking function example
We can combine the actual logistics system to push real-time logistics information to the client.

On the server side, you can monitor the updates of logistics information through scheduled tasks or event monitoring, and push the latest logistics information to the client.

// 假设我们有一个函数getLogisticsInfo，用于获取最新的物流信息
$logisticsInfo = getLogisticsInfo();
// 将最新的物流信息转为JSON格式，并推送给所有客户端
$msg = json_encode($logisticsInfo);
foreach ($this->clients as $client) {
    $client->send($msg);
}

On the client side, the latest logistics information pushed by the server can be received and displayed.

ws.onmessage = function(evt) {
    var message = evt.data;
    var logisticsInfo = JSON.parse(message);
    // 根据最新物流信息，更新页面显示内容
    // ...
};

Summary:
By developing WebSocket in PHP, we can realize the logistics tracking function based on real-time data push. Use the Ratchet library to develop a WebSocket server and interact with the server through the WebSocket API. The server can obtain and push the latest logistics information to the client through scheduled tasks or event monitoring, thereby realizing the function of real-time logistics tracking.
Through the code examples provided in this article, you can better understand and use PHP to develop WebSocket and implement real-time logistics tracking functions.

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