Description:
------------
http_request_body_encode - not work with array recursion for $fields


Reproduce code:
---------------
<?
$data = array('user'=>array('name'=>'Bob Smith',
                            'age'=>47,
                            'sex'=>'M',
                            'dob'=>'5/12/1956'),
              'pastimes'=>array('golf', 'opera', 'poker', 'rap'),
              'children'=>array('bobby'=>array('age'=>12,
                                               'sex'=>'M'),
                                'sally'=>array('age'=>8,
                                               'sex'=>'F')),
              'CEO');
echo (http_request_body_encode($data, array(__FILE__)));
?>

Expected result:
----------------
Content-Type: multipart/form-data; boundary=----------------------------6a9046bbcfa7
------------------------------6a9046bbcfa7
Content-Disposition: form-data; name="user[name]"

Bob Smith
------------------------------6a9046bbcfa7
Content-Disposition: form-data; name="user[age]"

47
------------------------------6a9046bbcfa7
Content-Disposition: form-data; name="user[sex]"

M
------------------------------6a9046bbcfa7--
etc

Actual result:
--------------
Content-Type: multipart/form-data; boundary=----------------------------6a9046bbcfa7
------------------------------6a9046bbcfa7
Content-Disposition: form-data; name="user"

Array
------------------------------6a9046bbcfa7
Content-Disposition: form-data; name="pastimes"

Array
------------------------------6a9046bbcfa7
Content-Disposition: form-data; name="children"

Array
------------------------------6a9046bbcfa7--