将x-www-form-urlencoded解码为数组

Question

I'm trying to transform PUT request params to a key=>value array in my server.

parse_str(file_get_contents('php://input'), $data);

This way I get a "dirt" array like this:

Array
(
    [------WebKitFormBoundaryXXXXXXXXXXXXXXXX
Content-Disposition:_form-data;_name] => "birth_date"

1995-01-03
------WebKitFormBoundaryXXXXXXXX
Content-Disposition: form-data; name="age"

15
------WebKitFormBoundaryXXXXXXXX--

)

How can I extrapolate just the two key=>values without manually parsing the content...?