Summary of several methods to obtain POST data in PHP

Summary of several methods to obtain POST data in PHP_PHP Tutorial

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Release： 2016-07-13 10:04:46

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A summary of several methods for PHP to obtain POST data

This article summarizes and introduces several common methods for PHP to obtain POST data. I will share it with you here for those in need. Let’s take a look.

1. Several methods for obtaining POST data with PHP

Method 1. The most common method is: $_POST['fieldname'];

Note: Only data submitted by Content-Type: application/x-www-form-urlencoded can be received
Explanation: That is the data POSTed from the form

Method 2, file_get_contents("php://input");

Description:
Allows reading the raw data of POST.
It puts less pressure on memory than $HTTP_RAW_POST_DATA and does not require any special php.ini settings.
php://input cannot be used with enctype="multipart/form-data".
Explanation:
For POST data without specifying Content-Type, you can use file_get_contents("php://input"); to obtain the original data.
In fact, this method can be used to receive any POST data using PHP. Regardless of Content-Type, including binary file streams is also acceptable.
So using method 2 is the safest method

Method 3, $GLOBALS['HTTP_RAW_POST_DATA'];

Description:
Always generates the $HTTP_RAW_POST_DATA variable containing the raw POST data.
This variable is only generated when data of an unrecognized MIME type is encountered.
$HTTP_RAW_POST_DATA is not available for enctype="multipart/form-data" form data
If the posted data is not recognized by PHP, you can use $GLOBALS['HTTP_RAW_POST_DATA'] to receive it,
Such as text/xml or soap, etc.
Explanation:
$GLOBALS['HTTP_RAW_POST_DATA'] stores the original data from POST.
$_POST or $_REQUEST stores data formatted by PHP in the form of key=>value.
However, whether the POST data is saved in $GLOBALS['HTTP_RAW_POST_DATA'] depends on the centent-Type setting. That is, when POSTing data, Content-Type must be explicitly specified: application/x-www-form-urlencoded. It will be stored in $GLOBALS['HTTP_RAW_POST_DATA']

2. Demonstration

1. How to obtain POST XML data and parse XML data in PHP

For example, when we develop a WeChat enterprise account, how do we process the data that users reply to?
Document: http://qydev.weixin.qq.com/wiki/index.php?title=%E6%8E%A5%E6%94%B6%E6%99%AE%E9%80%9A%E6%B6 %88%E6%81%AF
First check the documentation and you will know: After enabling development mode, when the user replies to the application, the WeChat server will POST a string of XML data to the verified callback URL

Assume the URL is http://www.xxx.com
Http request method: POST
http://www.xxx.com/?msg_signature=ASDFQWEXZCVAQFASDFASDFSS×tamp=13500001234&nonce=123412323

The XML content of POST is:

The code is as follows:

1348831860

1234567890123456
1

So how do you receive this content?
You can use it at this time: Method 2 (file_get_contents("php://input")), Method 3 ($GLOBALS['HTTP_RAW_POST_DATA'])

Method 2 (file_get_contents("php://input")):

The code is as follows:

$input = file_get_contents("php://input"); //Receive POST data
$xml = simplexml_load_string($input); //Extract POST data into simplexml object
var_dump($xml);

Method 3 ($GLOBALS['HTTP_RAW_POST_DATA'])

The code is as follows:

$input = $GLOBALS['HTTP_RAW_POST_DATA'];
libxml_disable_entity_loader(true);
$xml = simplexml_load_string($input, 'SimpleXMLElement', LIBXML_NOCDATA);
var_dump($xml);