Description:
------------
The copy() function returns false (but otherwise succeeds in copying the 
file) when the source file is accessed via a HTTP stream, but is empty 
(zero bytes).  Other, non-HTTP, stream types might also be affected, but 
local files are definitely *NOT* affected.

I have successfully reproduced this bug with PHP 5.2.9 on Linux, and 
5.2.5, 5.2.12, 5.3.0, 5.3.1 and 5.3.3-dev (2010-Jan-04 15:00:00) on 
Windows.

(I will keep the empty.txt URL in the reproduce code accessible for a 
while.)

Reproduce code:
---------------
$r = copy("http://lspace.sihnon.net/pub/empty.txt", "temp");
var_dump($r);

Expected result:
----------------
bool(true)

Actual result:
--------------
bool(false)