What does asynchronous notification in php mean?

php's asynchronous notification can be simply understood as a mechanism. This mechanism is used to realize data interaction or interface docking between systems. It can ensure the synchronization and accuracy of the data of both parties and avoid when the data update time intervals of both parties are inconsistent. Issues such as successful payment but failed results.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

1. What is PHP asynchronous notification?

PHP asynchronous notification can be simply understood as a mechanism, which is used to realize data interaction or interface docking between systems. Of course, in real development, no matter which language or framework it is, it has its own implementation methods and characteristics.

Specifically speaking of PHP asynchronous notification, it usually refers to a callback method implemented by the receiver (i.e. the server) when conducting transactions such as payment and third-party API - asynchronous notification callback.

2. The role of PHP asynchronous notification

For most transactions, it is often necessary to operate both parties at the same time, and the data update sequence at both ends is required to be consistent. , otherwise it will easily cause some data security problems. Therefore, system designers need to use asynchronous notifications after the transaction is completed to ensure the synchronization and accuracy of the data of both parties.

To visualize it, for example, consider an online shopping transaction scenario. When a user makes an online payment, the corresponding payment QR code will pop up at the front desk, and the QR code will be transferred to the payment page through server transfer. , after the user's payment tool scans and completes the payment, the QR code will return confirmation information and update the database. Then, the database will return the corresponding status feedback to the front end for display based on whether the transaction is successful or not.

If there is no asynchronous notification function, all order status must be updated synchronously, and it is impossible to avoid problems such as successful payment but failed display of results when the data update time intervals between the two parties are inconsistent.

3. Implementation method of PHP asynchronous notification

The implementation method of PHP asynchronous notification can usually use the curl library or fsockopen function. The specific implementation method is as follows:

Use curl library to implement asynchronous notification:

$url = "https://example.com/notify_url.php"; // 异步通知接口地址
$data = array(
    'order_id' => 001, // 订单号
    'amount' => 100, // 金额
    'status' => 1, // 状态码
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data)); // post请求数据
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 30); // 设置超时时间
curl_exec($ch);
curl_close($ch);

Use fsockopen function to implement asynchronous notification:

$url = "example.com"; // 服务器域名
$port = 80; // 服务器端口
$path = "/notify_url.php"; // 异步通知接口地址
$data = array(
    'order_id' => 001, // 订单号
    'amount' => 100, // 金额
    'status' => 1, // 状态码
);
$requestBody = http_build_query($data); // 构造post请求数据
$contentLength = strlen($requestBody); // 请求主体长度
$header = "POST {$path} HTTP/1.1\r\n";
$header .= "Host: {$url}\r\n";
$header .= "Content-type: application/x-www-form-urlencoded\r\n";
$header .= "Content-length: {$contentLength}\r\n";
$header .= "Connection: close\r\n\r\n";
$header .= $requestBody; // 拼接http头和请求主体
$fp = fsockopen($url, $port, $errno, $errstr, 30); // 建立socket连接
if ($fp) { // 发送请求并获取返回结果
    fwrite($fp, $header);
    stream_set_timeout($fp, 30);
    $response = stream_get_meta_data($fp);
    fclose($fp);
}

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