PHP Websocket development guide to implement real-time express query function-PHP Tutorial-php.cn

PHP Websocket development guide to implement real-time express query function

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Release： 2023-12-02 09:58:01

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PHP Websocket开发指南，实现实时快递查询功能

PHP Websocket Development Guide, to implement real-time express query function, requires specific code examples

Introduction:
With the continuous development of the Internet, more and more Websites and applications need to implement real-time data updates and communication capabilities. As a real-time communication technology, Websocket has gradually been widely used in various Web development scenarios. This article will introduce how to use PHP to develop Websocket to implement real-time express query function, and provide specific code examples.

1. What is Websocket?
Websocket is a full-duplex communication protocol that allows the establishment of a persistent connection between the client and the server to achieve real-time two-way data transmission. Through Websocket, the server can actively push data to the client without requiring the client to send frequent requests.

2. Why use Websocket?
Using the traditional HTTP protocol, the client needs to continuously send requests to obtain updated data from the server. This will cause a large number of requests to frequently transmit data, occupy bandwidth and resources, and will also increase the pressure on the server. Using Websocket can reduce the number of requests, improve the real-time nature of data, and reduce resource consumption, making it an ideal choice for real-time communication.

3. How to use PHP to develop Websocket?

Install PHP's swoole extension
Websocket development can use PHP's swoole extension. First, make sure that the corresponding swoole extension has been installed. You can install it by executing the following command:
```
pecl install swoole
```
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Writing server-side code
To develop Websocket using PHP, you need to write server-side code. The following is an example of server-side code:

<?php
$server = new SwooleWebSocketServer("0.0.0.0", 9502);

$server->on('open', function (SwooleWebSocketServer $server, $request) {
    echo "new connection open: {$request->fd}
";
});

$server->on('message', function (SwooleWebSocketServer $server, $frame) {
    echo "received message: {$frame->data}
";
    $server->push($frame->fd, json_encode(['message' => 'Hello']));
});

$server->on('close', function ($ser, $fd) {
    echo "connection close: {$fd}
";
});

$server->start();

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Writing client code
The client code of Websocket is relatively simple. The following is a simple example of Websocket client code:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Websocket Client</title>
</head>
<body>
<script>
    var ws = new WebSocket('ws://localhost:9502');
    ws.onopen = function() {
        console.log('Connected');
    };
    ws.onmessage = function(event) {
        var data = JSON.parse(event.data);
        console.log('Received message:', data.message);
    };
    ws.onclose = function() {
        console.log('Connection closed');
    };
</script>
</body>
</html>

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4. Real-time express query function
Through Websocket, real-time express query function can be realized. When a user submits a request to query express delivery, the server can obtain the express delivery information in real time and push the query results to the client through Websocket. The following is a sample code to implement the express query function:

<?php
// ... 服务器端代码 ...

$server->on('message', function (SwooleWebSocketServer $server, $frame) {
    $trackingNumber = $frame->data; // 获取客户端提交的快递单号
    $expressInfo = fetchExpressInfo($trackingNumber); // 查询快递信息
    $server->push($frame->fd, json_encode($expressInfo));
});

// ... 其他代码 ...

function fetchExpressInfo($trackingNumber) {
    // 调用相关的API或查询数据库获取快递信息
    // 实际情况根据具体需求进行实现
    return [
        'trackingNumber' => $trackingNumber,
        'info' => 'xxxx',
    ];
}

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In this way, after the user submits the express query request on the client, the server will obtain the express information in real time and push the query results to the client, realizing Real-time express query function.

Summary:
This article introduces the PHP Websocket development guide and how to use PHP to develop Websocket. The real-time express query function is implemented in the code example. By mastering Websocket development technology, you can achieve more real-time communication functions, improve user experience, and enhance the real-time nature of applications. Hope it helps readers.

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