Description:
------------
When submitting a GET request with the header 'Content-Type: application/json' the  
$_POST superglobal is set to NULL. It should always be an empty array. Although 
the Content-Type is not required for a GET, some client side frameworks such as 
backbone and spine include it by default, regardless of whether is is a GET, PUT 
or POST. PHP frameworks such as Symfony2 expect the $_POST superglobal to be an 
array at all times. 

Test script:
---------------
<?php


/**
When accessing this via a GET request with the Content-Type header set to application/json, the $_POST superglobal is set to NULL. It should be set as a blank array.
**/


var_dump($_POST);
die();

?>

Expected result:
----------------
array()

Actual result:
--------------
NULL