Description:
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; Whether PHP will read the POST data.
; This option is enabled by default.
; Most likely, you won't want to disable this option globally. It causes $_POST
; and $_FILES to always be empty; the only way you will be able to read the
; POST data will be through the php://input stream wrapper. This can be useful
; to proxy requests or to process the POST data in a memory efficient fashion.
; http://php.net/enable-post-data-reading
;enable_post_data_reading = Off


READ CAREFULLY: the only way you will be able to read the POST data will be through the php://input stream wrapper

Test script:
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set php.ini:

enable_post_data_reading = Off

and try to get POST data by

file_get_contents('php://input')

Expected result:
----------------
[POST data string]

(PHP 5.5 works perfect)

Actual result:
--------------
empty string