Description:
------------
There is a functional difference for the function http_build_query in both 5.2.8 
and 5.3.1

Test script:
---------------
$parameters = array(
			'user_name' =>'phaniapsr@gmail.com',
			'pass_word' =>'ravi@gmail.com'
			);

$reqData = http_build_query($parameters);

The above code sample i have tested in PHP 5.3.1 and PHP 5.2.8.
I got different outputs in each version.

Expected result:
----------------
In PHP 5.3.1 i got:

user_name=phaniapsr%40gmail&pass_word=ravi%40gmail.com


In PHP 5.2.8 i got:

user_name=phaniapsr%40gmail&pass_word=ravi%40gmail.com

Actual result:
--------------
I am expecting both the versions should come with same outputs. In PHP 5.3.1 it 
converted & to & but in 5.2.8 & remain same.

In my view this change should not happen. I mean & should not be converted to 
&. It is creating problem in the CURL usage.