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Analysis on the application of PHP real-time communication function in logistics tracking system

王林Original: 2023-08-10 16:29:061089browse

Analysis of the application of PHP real-time communication function in logistics tracking system

Introduction:
In today's rapidly developing logistics industry, real-time tracking of the location and location of goods Status is crucial. Traditional logistics tracking systems usually use polling to obtain the latest data, which is not only inefficient but also has high latency. Therefore, this article will explore how to use PHP's real-time communication function to achieve real-time data updates in the logistics tracking system, and give corresponding code examples.

1. Basic principles of real-time communication
Real-time communication refers to the process of transmitting information to a device or application in a real-time manner through the network without manual intervention. Commonly used technologies for realizing real-time communication include WebSocket and long polling.

WebSocket
WebSocket is a full-duplex communication protocol based on the TCP protocol that enables real-time data transmission by creating a persistent connection between the client and the server. Compared with traditional HTTP requests, WebSocket only needs to establish a connection once. After the connection is established, real-time communication can be achieved between the client and the server by sending messages.
Long polling
Long polling means that the client sends a persistent HTTP request to the server, and the server will only return a response when there is new data. The client immediately sends a new request after receiving the response from the server, realizing instant data transmission.

2. Application of real-time communication in logistics tracking system
Real-time communication is widely used in logistics tracking system. For example, logistics companies need to track the location and status of goods in real time and update relevant information to customers in a timely manner. Through real-time communication technology, the logistics system can immediately transmit the latest information to customers when the status of goods changes, improving user experience and logistics management efficiency.

Below we will take a simple logistics tracking system as an example to introduce how to use the PHP real-time communication function to achieve real-time data updates.

Front-end page code

<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>物流追踪系统</title>
</head>
<body>
 <h1>物流追踪结果</h1>
 <ul id="logistics-list"></ul>

 <script>
     var socket = new WebSocket('ws://localhost:8080');

     socket.onmessage = function(event) {
         var data = JSON.parse(event.data);
         var li = document.createElement("li");
         li.innerHTML = "货物编号：" + data.orderId + "，状态：" + data.status;
         document.getElementById("logistics-list").appendChild(li);
     };
 </script>
</body>
</html>

PHP back-end code

<?php
$server = new swoole_websocket_server("0.0.0.0", 8080);

$server->on('open', function (swoole_websocket_server $server, $request) {
 echo "New WebSocket connection established: {$request->fd}
";
});

$server->on('message', function (swoole_websocket_server $server, $frame) {
 $data = json_decode($frame->data, true);
 $orderId = $data['orderId'];
 // 查询货物状态
 $status = getOrderStatus($orderId);
 $response = array('orderId'=>$orderId, 'status'=>$status);
 // 将结果发送给客户端
 $server->push($frame->fd, json_encode($response));
});

$server->on('close', function (swoole_websocket_server $server, $fd) {
 echo "Connection closed: {$fd}
";
});

$server->start();

function getOrderStatus($orderId) {
 // 查询数据库或调用物流接口获取最新的货物状态
 return '已签收';
}

The above code snippet shows How to use WebSocket to implement the real-time communication function of the logistics tracking system. The front-end page establishes a connection with the back-end through WebSocket, listens for messages from the server, and dynamically updates the cargo tracking results in the page after receiving the message.

Conclusion:
This article takes the application of PHP real-time communication function in logistics tracking system as an example, introduces the basic principles of real-time communication, and gives corresponding code examples. Using real-time communication technology, the logistics tracking system can achieve real-time data updates, improve logistics management efficiency, and enhance user experience. I hope this article can provide reference and help to relevant developers in real-time communication of logistics tracking systems.

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