What is HTTP_RAW_POST_DATA?

1) What is it?
$ HTTP_RAW_POST_DATA contains the raw (raw) POST data.
those. if we send the following dataset via POST:
(
[name] => Masha
[time] => 12-00
)
then the following line will be in $ HTTP_RAW_POST_DATA:
name=John&time=2pm

2) How can I reach another variable?
Three equal ways:
$ HTTP_RAW_POST_DATA
$ GLOBALS ['HTTP_RAW_POST_DATA']
file_get_contents ('php: // input')

3) The $ HTTP_RAW_POST_DATA variable is not available. What to do?
- in php.ini enable always_populate_raw_post_data = On, which will always allow to fill the $ HTTP_RAW_POST_DATA variable
- access data via file_get_contents ('php: // input'). This method does not depend on directives in php.ini.
- use any unidentified MIME data type (for example: $ HTTP_RAW_POST_DATA is not generated for: multipart / form-data and application / x-www-form-urlencoded types and works for application / octet-stream type)

4) Why is the $ _POST array empty, although the data is accurately transmitted?
Because this data could not be processed and they are simply located in $ HTTP_RAW_POST_DATA

5) What is: php: // input?
php: // input is a read-only stream that allows you to read raw data from the request body. In the case of POST requests, it is preferable to use php: // input instead of $ HTTP_RAW_POST_DATA, since this method does not depend on special php.ini directives. In addition, in cases where $ HTTP_RAW_POST_DATA is not populated by default, it is potentially less memory-intensive than activating the always_populate_raw_post_data directive. php: // input is not available with content type enctype = "multipart / form-data".

6) You can show by example what $ HTTP_RAW_POST_DATA is?

  We send via POST array:
 Array
 (
     [name] => Masha
     [time] => 12-00
 )
 We get: 

CONTENT_TYPE: application / octet-stream

$ _POST array:
Array
(
)

Variable $ HTTP_RAW_POST_DATA:
name = Masha & time = 12-00

File_get_contents ('php: // input') value:
name = Masha & time = 12-00

- >> We notice that the $ _POST array is empty, $ HTTP_RAW_POST_DATA is available << -

CONTENT_TYPE: application / x-www-form-urlencoded

$ _POST array:
Array
(
[name] => Masha
[time] => 12-00
)

Variable $ HTTP_RAW_POST_DATA:
Undefined variable: HTTP_RAW_POST_DATA

File_get_contents ('php: // input') value:
name = Masha & time = 12-00

- >> Data in $ _POST, and $ HTTP_RAW_POST_DATA is inaccessible << -