Description:
------------
Hi,
Running a simple oauth request results in all keys returned by getLastResponseInfo being suffixed with a null byte.

seems like this was reported here (incorrectly), but, never looked at.

https://github.com/dropbox-php/dropbox-php/issues/31

This is very fun to debug as print_r/var_dump and even serialize don't display/encode the non-printable characters.

# php --re oauth|head
Extension [ <persistent> extension #32 OAuth version 2.0.2 ] {

I don't have the latest version of the OAuth extension but the only changes from 2.0.2 to 2.0.3 appear to be irrelevant.

Test script:
---------------
<?php
$oauth = new OAuth('a', 'b',OAUTH_SIG_METHOD_HMACSHA1,OAUTH_AUTH_TYPE_AUTHORIZATION);
$oauth->fetch("https://www.google.com/",array(),OAUTH_HTTP_METHOD_GET,array("Accept"=>"text/xml"));
$response_info = $oauth->getLastResponseInfo();
print_r($response_info);
var_dump($response_info);
printf("%s\n",json_encode($response_info,JSON_PRETTY_PRINT));

Actual result:
--------------
php test2.php 
Array
(
    [url] => https://www.google.com/
    [http_code] => 200
    [content_type] => text/html; charset=ISO-8859-1
    [size_download] => 47244
    [size_upload] => 0
)
array(5) {
  ["url"]=>
  string(23) "https://www.google.com/"
  ["http_code"]=>
  int(200)
  ["content_type"]=>
  string(29) "text/html; charset=ISO-8859-1"
  ["size_download"]=>
  float(47244)
  ["size_upload"]=>
  float(0)
}
{
    "url\u0000": "https:\/\/www.google.com\/",
    "http_code\u0000": 200,
    "content_type\u0000": "text\/html; charset=ISO-8859-1",
    "size_download\u0000": 47244,
    "size_upload\u0000": 0
}