How to implement a real-time vending machine monitoring system using PHP and Redis-PHP Tutorial-php.cn

How to implement a real-time vending machine monitoring system using PHP and Redis

王林

Release： 2023-06-28 09:14:02

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With the advancement of technology and the popularity of the Internet of Things, vending machines have become one of the common devices in people’s lives. However, the monitoring and management of vending machines is a very complex task that would be very cumbersome and time-consuming if traditional methods are used. Therefore, this article will introduce how to use PHP and Redis to implement a real-time vending machine monitoring system, thereby improving the management efficiency and accuracy of vending machines.

Redis is an in-memory data storage system that can be used to store and access data. It also supports a variety of data structures, such as strings, hash tables, lists, and sets. PHP is a popular server-side programming language that can be used to handle tasks such as web requests and responses. If these two technologies are combined, an efficient vending machine monitoring system can be achieved.

Step 1: Set up the environment

First, you need to install Redis and PHP on the server. You can download the Redis installation package from the official website. For detailed installation methods, please refer to the official documentation. PHP can be installed through conventional methods, such as through the yum or apt-get command.

Step 2: Write a PHP script

Next, you need to write a PHP script to monitor and manage the vending machine. The following is a simple example:

<?php
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

$machine_id = $_GET['machine_id'];
$data = json_decode($_GET['data'], true);

foreach ($data as $item) {
    $slot_id = $item['slot_id'];
    $quantity = $item['quantity'];
    $redis->hset($machine_id, $slot_id, $quantity);
}

echo 'OK';
?>

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This script can store the status information of the vending machine into Redis. Specifically, first connect to the Redis server, then obtain the data from the vending machine, parse the data in JSON format, traverse the status information of each aisle, and store it in Redis. Each vending machine has a unique ID for easy identification and query. Finally, an "OK" string is returned to indicate that the operation was successful.

Step 3: Implement the monitoring interface

In order to better manage and monitor the vending machine, a simple Web interface needs to be implemented to display the status information of the vending machine. The following is a simple example:

<html>
<head>
    <meta http-equiv="refresh" content="10">
    <title>Vending Machine Monitor</title>
</head>
<body>
    <table>
        <thead>
            <tr>
                <th>Machine ID</th>
                <th>Slot ID</th>
                <th>Quantity</th>
            </tr>
        </thead>
        <tbody>
            <?php
            $redis = new Redis();
            $redis->connect('127.0.0.1', 6379);

            $keys = $redis->keys('*');
            foreach ($keys as $machine_id) {
                $values = $redis->hgetall($machine_id);
                foreach ($values as $slot_id=>$quantity) {
                    echo '<tr>';
                    echo '<td>'.$machine_id.'</td>';
                    echo '<td>'.$slot_id.'</td>';
                    echo '<td>'.$quantity.'</td>';
                    echo '</tr>';
                }
            }
            ?>
        </tbody>
    </table>
</body>
</html>

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This interface is very simple, just a simple HTML table used to display the status information of the vending machine. The interface is automatically refreshed every 10 seconds to obtain the latest status information. The purpose of the PHP code is to connect to the Redis server, obtain all vending machine IDs and status information, and display them on the page.

Summary

Using PHP and Redis to implement a real-time vending machine monitoring system is very simple and efficient. Redis provides fast data storage and access capabilities, while PHP can provide powerful web development tools. Combining these two technologies can achieve an efficient, reliable, and easy-to-use vending machine monitoring system, which can greatly improve the management efficiency and accuracy of vending machines.

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