Description:
------------
If a non-associative array is passed to the 
$extra_parameters paramter of OAuth::fetch() a segmentation 
fault occurs.

Makes debugging a typo like array('a', 'b') instead of 
array('a' => 'b') particularly difficult.


PHP 5.2.10-2ubuntu6.4 with Suhosin-Patch 0.9.7 (cli) (built: 
Jan  6 2010 22:56:44) 
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend 
Technologies
    with XCache v1.2.2, Copyright (c) 2005-2007, by mOo
    with Xdebug v2.0.4, Copyright (c) 2002-2008, by Derick 
Rethans


[Thu Apr 29 10:57:30 2010] [notice] child pid 13450 exit 
signal Segmentation fault (11)

Reproduce code:
---------------
$o = new OAuth('x', 'x');
$o->fetch('http://example.org/', array('x'));

Expected result:
----------------
Something other than a segfault.
Perhaps an exception suggesting that an associative array is 
required?

Actual result:
--------------
In Google Chrome:
Error 324 (net::ERR_EMPTY_RESPONSE): Unknown error.

In Apache error log:
[Thu Apr 29 10:57:30 2010] [notice] child pid 13450 exit 
signal Segmentation fault (11)