How to use PHP to implement the takeout ordering function of WeChat applet?

How to use PHP to implement the takeout ordering function of WeChat mini program?

With the rise of WeChat mini programs, takeout ordering has become an indispensable part of many people’s lives. As a popular server-side programming language, PHP can easily interact with WeChat mini programs. This article will introduce how to use PHP to implement the takeout ordering function of the WeChat applet and give specific code examples.

1. Obtain user authorization

In order to implement the takeout ordering function, you first need to obtain the user's authorization to log in to the WeChat applet. You can obtain the user's temporary login credentials (code) through the login interface provided by the WeChat applet, such as wx.login(). Send the credentials to the server side and use the interface written in PHP for processing.

The following is a sample code written in PHP:

<?php

$code = $_GET['code']; // 从请求参数中获取code

// 发送请求到微信服务器，换取openid和session_key
$appid = 'YOUR_APPID';
$secret = 'YOUR_SECRET';
$grant_type = 'authorization_code';

$url = "https://api.weixin.qq.com/sns/jscode2session?appid=$appid&secret=$secret&js_code=$code&grant_type=$grant_type";

$response = file_get_contents($url); // 发送请求

$data = json_decode($response, true); // 解析返回结果

$openid = $data['openid']; // 获取openid
$session_key = $data['session_key']; // 获取session_key

// 将openid和session_key保存到服务器端，用于后续的业务逻辑

?>

2. Menu data and page display

In order to implement the takeout ordering function, the menu needs to be prepared The data is displayed on the mini program page. You can use PHP to get data from the database and return the data to the applet in JSON format.

The following is a sample code written in PHP:

<?php

// 连接数据库（假设使用MySQL）
$servername = "localhost";
$username = "YOUR_USERNAME";
$password = "YOUR_PASSWORD";
$dbname = "YOUR_DBNAME";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 查询菜单数据
$sql = "SELECT * FROM menu";
$result = $conn->query($sql);

$menus = array(); // 用于保存所有菜单数据

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        $menu = array(
            "id" => $row["id"],
            "name" => $row["name"],
            "price" => $row["price"],
            "image" => $row["image"]
        );

        array_push($menus, $menu);
    }
}

$conn->close();

// 将菜单数据以JSON格式返回给小程序
echo json_encode($menus);

?>

3. Order processing

When the user selects the dish and submits the order, he needs to Order processing is done on the server side. You can use PHP to receive order data and perform corresponding processing, such as saving orders to the database, sending notifications, etc.

The following is a sample code written in PHP:

<?php

// 获取用户提交的订单数据
$openid = $_POST['openid']; // 用户openid
$items = json_decode($_POST['items'], true); // 订单菜品列表
$total = $_POST['total']; // 订单总金额

// 将订单数据保存到数据库
$servername = "localhost";
$username = "YOUR_USERNAME";
$password = "YOUR_PASSWORD";
$dbname = "YOUR_DBNAME";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$sql = "INSERT INTO orders (openid, items, total) VALUES ('$openid', '$items', '$total')";

if ($conn->query($sql) === TRUE) {
    echo "订单保存成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();

// 处理订单完毕，可以发送通知给用户等

?>

The above are the detailed steps and corresponding code examples on how to use PHP to implement the takeout ordering function of the WeChat applet. Through these examples, the development of the WeChat mini program takeout ordering function can be completed more easily in actual projects. Hope this helps!

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