How to get post request parameters in php

In Web back-end development, PHP is a very commonly used programming language. When processing POST requests of the HTTP protocol, we need to obtain the values ​​of the request parameters for subsequent logical processing. Normally, we use the $_POST array to get POST request parameters. However, sometimes we need to obtain POST request parameters not values, but other related information. This article will introduce different methods of obtaining POST request parameters in PHP and explain their advantages and disadvantages.

1. Use $_POST to get the value of the POST request parameter

$_POST is one of PHP's built-in super global variables, used to get the parameter value from the POST request. Specifically, when the client sends a request to the Web server through POST, the server stores the parameter data in the POST request in the $_POST array. Developers can directly use the $_POST array to obtain the values ​​of the POST request parameters.

For example, assume that the client sends a POST request containing the parameter name to the server:

In the back-end PHP code, we can get the request in the following way The name parameter value:

$name = $_POST['name'];

The advantage of using the $_POST array to obtain the value of the POST request parameter is that it is simple and fast, and has high development efficiency. However, its shortcomings are also very obvious: if the POST request parameter name submitted by the client is spelled incorrectly, or the request parameter does not exist, the $_POST array will return null, which will bring a lot of trouble to development. In addition, when using $_POST to obtain the value of the POST request parameter, we cannot know some other relevant information about the request parameter, such as parameter type, encoding method, etc. This information may also be very important for some refined operations.

2. Use $GLOBALS['HTTP_RAW_POST_DATA'] to obtain the original data of the POST request parameters

In addition to using the $_POST array to obtain the POST parameter value, we can also use $GLOBALS['HTTP_RAW_POST_DATA '] Get the raw data of POST parameters. The idea of ​​this method is to obtain the data of the request parameters through the HTTP protocol itself, and then use PHP's string manipulation functions to parse and process the data.

For example, the following code can get the POST request parameters:

$postData = $GLOBALS['HTTP_RAW_POST_DATA'];

if(!empty($postData)){
// Parse and process $postData
}

The advantage of this method is that the original data of the request parameters can be obtained, and developers can perform more flexible and detailed processing. However, its shortcomings are also obvious: in newer PHP versions, $GLOBALS['HTTP_RAW_POST_DATA'] has been cancelled, and compatibility issues will occur when using it. In addition, when using this method, you need to parse and process the request parameters yourself. Improper parsing and processing may lead to request errors or security vulnerabilities. You also need to consider issues such as capitalization and encoding.

3. Use the php://input stream to obtain the original data of the POST request parameters

Similar to using $GLOBALS['HTTP_RAW_POST_DATA'] to obtain the original data of the POST request parameters, you can also use php The ://input stream gets the POST request parameters. The php://input stream is a way for PHP to read the request body. Through this stream, we can obtain the original data of the request parameters of the POST request. The following code demonstrates how to use the php://input stream to get POST request parameters:

$postData = file_get_contents('php://input');

if(!empty($postData )){
// Parse and process $postData
}

The advantage of this method is that it can use PHP standard library functions to parse and process request parameters, which has high flexibility. However, its shortcomings are also very obvious: if the request parameters are not parsed and processed properly, request errors or security vulnerabilities will still occur.

In summary, each method of obtaining POST request parameters has its own advantages and disadvantages. In actual development, we need to choose a method that suits us based on the characteristics of the project. At the same time, we also need to pay special attention to security issues. When using any method to obtain request parameters, we need to handle the request parameters carefully to ensure the security and correctness of the request data.

The above is the detailed content of How to get post request parameters in php. For more information, please follow other related articles on the PHP Chinese website!