How does the PHP server respond to a POST request?

In PHP, you can use the $_POST superglobal variable to retrieve parameters from a POST request, and then use the echo or print function to send the response back to the client.

The following is an example code demonstrating how to handle a POST request.

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // 获取POST请求的参数
    $name = $_POST['name'];
    $age = $_POST['age'];

    // 处理POST请求的数据
    // ...

    // 构造响应结果
    $response = array('status' => 'success', 'message' => 'POST请求成功');

    // 将响应结果返回给客户端
    echo json_encode($response);
}
?>

In the given example code, it starts by checking if the request method is POST, then retrieves the POST parameters using $_POST. Depending on the actual requirements, the data from the POST request can be processed. Finally, an array containing the response result is constructed, and the array is converted into a JSON formatted string using the json_encode function. Lastly, the JSON string is echoed back to the client as the response.

It is important to note that the response data format can be adjusted according to the actual situation, which can be JSON, XML, or other formats.