Swoole implements technical implementation of asynchronous callback for WeChat payment

In traditional website development, when developing using PHP, it is generally necessary to use asynchronous callbacks to implement payment-related functions. Swoole is a high-performance, asynchronous, event-driven network communication engine developed based on PHP language. Swoole has many advantages such as asynchronous callbacks, coroutines, and multi-processes, and is suitable for developing large-scale and highly concurrent network applications. In this article, we will introduce how to use Swoole to implement the asynchronous callback function of WeChat payment.

1. Preparation work

Before starting to use Swoole to implement asynchronous callbacks, we need to prepare the following work:

1. Install PHP and Swoole extensions locally or on the server

2. Register a merchant account on the WeChat payment merchant platform and obtain the relevant payment key and merchant number

3. Write a PHP file that handles payment callbacks

2. Implementation process

1. Create a Swoole Server

First, we need to use Swoole to create a Server. In this Server, we will monitor the WeChat payment callback request and process the request:

$server = new SwooleHttpServer('0.0.0.0', 80, SWOOLE_PROCESS, SWOOLE_SOCK_TCP);

$server->on('start', function ($server) {
    echo "Swoole server is started.
";
});

$server->on('request', function ($request, $response) {
    // 在这里对微信支付回调请求进行处理
});

2. Process the WeChat payment callback request

After receiving the WeChat payment callback request After that, we need to process the request. At this time, we can parse the data in the request and verify it to ensure the legitimacy of the request.

$xml = file_get_contents('php://input');
$data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);

if ($data['return_code'] == 'SUCCESS') {
    // 验证签名
    if (validateSign($data)) {
        // 在这里进行相应的业务逻辑处理，如更新订单状态
    }
}

function validateSign($data) {
    $sign = $data['sign'];
    unset($data['sign']);

    $params = [];
    foreach ($data as $key => $value) {
        if ($value != '' && !is_array($value)) {
            $params[] = $key . '=' . $value;
        }
    }
    sort($params);
    $str = implode('&', $params) . '&key=' . PAY_KEY;
    $signStr = strtoupper(md5($str));

    return $signStr == $sign;
}

In the above code, we first parse the XML data in the payment callback request into a PHP array. Then we check if the return_code in the request is SUCCESS. If so, we need to verify the signature of the request to ensure the security of the request. If the verification passes, we can perform corresponding business logic processing here, such as updating the order status.

It should be noted that PAY_KEY is the payment key we created on the WeChat Pay merchant platform and can be found on the platform.

3. Initiate return information to WeChat Pay

After processing, we need to initiate return information to WeChat Pay. Here, we need to return data in XML format and use Swoole's Response object to return:

$xml = '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
$response->header('Content-Type', 'text/xml');
$response->end($xml);

It should be noted that we need to specify the returned Content-type as text/xml and use Swoole's Response The object is returned.

4. Start Swoole Server

Finally, we only need to call the $server->start() method to start our Swoole Server:

$server->start();

3. Summary

In this article, we briefly introduced how to use Swoole to implement the asynchronous callback function of WeChat payment. Here we only list some simple code snippets. The specific implementation is best improved according to your own business needs. Using Swoole to develop asynchronous callbacks can greatly improve the performance of our program and improve the scalability and maintainability of the program. It is a new development method worth trying.

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