Use PHP and React to develop a dynamic data visualization application that displays data changes in real time

In today's digital era, data visualization has become an important tool and has been widely used in all walks of life. It can transform complex data into intuitive graphics and charts, making the data easier to understand and analyze. With the substantial increase in data volume and real-time requirements, more developers are beginning to use PHP and React to build dynamic data visualization applications to display data changes in real time.

This article will introduce you to the process of using PHP and React to build such a data visualization application, as well as the related technical implementation.

1. Overview of technical architecture

First, we need to understand the technical architecture of this application. In this article, we will use PHP and React to jointly develop this application, and will use WebSocket to implement real-time data push functionality. The specific technology selection is as follows:

• Back-end technology: PHP, MySQL, WebSocket
• Front-end technology: React, WebSocket

2. Back-end Implementation

In the back-end implementation, we will use PHP and MySQL to complete data reading and updating, and establish real-time data communication between the front and back ends through WebSocket.

1. Data reading

We first need to define a PHP file data.php to read the data that needs to be visualized. In this file, we can use SQL query statements to obtain the data set that needs to be displayed and convert it into an array data format.

2. WebSocket communication

In PHP, we can use the Ratchet library to implement WebSocket communication. The specific code implementation is as follows:

use RatchetMessageComponentInterface;
use RatchetConnectionInterface;

class Websocket 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, $msg) {
    foreach ($this->clients as $client) {
        if ($client !== $from) {
            $client->send($msg);
        }
    }
}

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

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

}

In the above code, We first defined the Websocket class and created an object storage to store the client connection through the constructor. Next, we implemented four WebSocket event functions, onOpen, onMessage, onClose and onError, to handle connection events, data receiving events, closing events and exception events.

3. Front-end implementation

In the front-end implementation, we will use React to build the basic page framework and establish communication with the back-end through WebSocket to display data changes in real time.

1. Create a React component

We first need to create a React component Index as the entry component of the visual application. In this component, we will establish communication through WebSocket and update the rendering data of the page through the setState method after receiving the data update notification. The specific code implementation is as follows:

import React from 'react';
import { w3cwebsocket as WebSocket } from 'websocket';

class Index extends React.Component {

constructor(props) {
    super(props);
    this.state = {
        data: []
    };
}

componentDidMount() {
    const client = new WebSocket('ws://localhost:8088');
    client.onmessage = (message) => {
        const data = JSON.parse(message.data);
        this.setState({ data });
    };
}

renderTableData() {
    // 渲染数据表格
}

render() {
    return (
        <div>
            <table>
                <thead>
                    <tr>
                        <th>名称</th>
                        <th>数值</th>
                    </tr>
                </thead>
                <tbody>
                    {this.renderTableData()}
                </tbody>
            </table>
        </div>
    );
}

}

export default Index;

In the above code, we first introduced the WebSocket module through the WebSocket library, and initialized a state object in the constructor to store the following data received by the end. In the componentDidMount() function, we perform data reception and rendering update operations through the onmessage event of WebSocket. Finally, we use the renderTableData() function to render the real-time updated data table.

2. Build React application

After completing the creation of the Index component, we need to mount it on the page through the ReactDOM.render method. The specific implementation code is as follows:

import React from 'react';
import ReactDOM from 'react-dom';
import Index from './Index';

ReactDOM. render(, document.getElementById('root'));

In this code block, we render the Index component to the root node through the ReactDOM.render() function.

4. Summary

So far, we have completed the implementation of building a dynamic data visualization application with PHP and React. By establishing communication through WebSocket, we realize real-time data transmission and display between the front and back ends. This application can be used as a template application to implement and extend more functions and details to meet different business needs.

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