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Develop online ordering function using PHP and Websocket

WBOYOriginal: 2023-12-02 14:17:14919browse

Using php and Websocket to develop online ordering function

With the continuous development of technology, people's lifestyles are gradually changing. Nowadays, more and more people choose to order online through the Internet, including food ordering services. In order to meet the needs of users, many restaurants have begun to develop online ordering functions. This article will introduce how to use PHP and Websocket to develop a simple online ordering function, and provide specific code examples.

Understanding Websocket Technology
Websocket is a two-way communication technology based on the TCP protocol, which allows real-time two-way data transmission between the server and the client. Compared with traditional HTTP requests, Websocket can achieve real-time data updates, which is very suitable for scenarios such as online ordering that require timely updates.
Environment setup
First, make sure that the relevant dependency extensions for php and Websocket have been installed on the server. For example, on a Linux system, you can install php and Websocket extensions with the following command:

sudo apt-get install php

sudo apt-get install php-dev

sudo pecl install channel://pecl.php.net/ev-1.0.3

Complete After installation, you can use the phpinfo() function to confirm whether the installation is successful.

Writing server-side code
The following is a simple server-side code example for handling the business logic of online ordering:

<?php
require 'vendor/autoload.php';
$app = function ($request, $response) {
    $res = [];
    if ($request->isPost()) {
        $data = $request->post();
        // 处理订餐逻辑
        // ...
        $res['status'] = 'success';
        $res['message'] = '订餐成功';
    } else {
        $res['status'] = 'error';
        $res['message'] = '非法请求';
    }
    $response->write(json_encode($res));
};

In this code, We first loaded the required dependencies. Then, a server application was created through anonymous functions to handle the ordering business logic based on the type of request.

Writing client code
The following is a simple client code example for sending an order request and receiving a response from the server:

<!DOCTYPE html>
<html>
<head>
    <title>在线点餐</title>
    <script>
        var socket = new WebSocket("ws://localhost:8000");
        
        socket.onopen = function(event) {
            console.log("连接成功");
        };
        
        socket.onmessage = function(event) {
            var response = JSON.parse(event.data);
            if (response.status === "success") {
                alert(response.message);
            } else {
                console.error(response.message);
            }
        };
        
        function placeOrder() {
            var formData = new FormData();
            formData.append("dish", "鱼香肉丝");
            formData.append("quantity", 2);
            
            var xhr = new XMLHttpRequest();
            xhr.open("POST", "/order.php");
            xhr.send(formData);
        }
    </script>
</head>
<body>
    <button onclick="placeOrder()">点餐</button>
</body>
</html>

In the client In the end code, we first create a connection to the server through the WebSocket object. After the connection is successful, we can listen to the data returned by the server through the onmessage event. When we click the "Order Food" button, a POST request will be sent to the server with the order information.

Run the example
Save the above code as server.php and client.html, and then run the following commands in the command line:

php -S localhost :8000 server.php

Open localhost:8000 in the browser, click the "Order" button, and you can see the corresponding information returned by the server.

Through the above steps, we successfully developed a simple online ordering function using php and Websocket. Of course, this is just a basic example, you can make more complex developments according to your own needs. Hope this article can be helpful to you!

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