Description:
------------
When using current on an SplObjectStorage instance I'd expect (according 
to the documentation) to get the current object back. Instead I get back 
false.

Reproduce code:
---------------
<?php
$s = new SplObjectStorage();
$o = new stdClass();
$s->attach($o);
reset($s);
var_dump(current($s));
?>

Expected result:
----------------
object(stdClass)#2 (0) {
}


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