Description:
------------
When using a DatePeriod, calling getTimestamp on the objects returns wrong results, starting with the second Datetime.
This is probably connected with http://bugs.php.net/bug.php?id=52454 and might have been fixed by it's solution.

I'm on gentoo 64bit testing using php-5.3.3. Also confirmed on debian 32bit using php5.3.2-1.

Test script:
---------------
<?php

$start = new Datetime('2010-11-10 08:00:00 UTC');
$delta = new DateInterval('P1D');
$snd = new Datetime('2010-11-11 08:00:00 UTC');
$period = new DatePeriod($start, $delta, 3);

echo 'We should get:   ' . $snd->getTimestamp() . "\n";

$manual = clone $start;
$manual->add($delta);
echo 'Manually adding: ' . $manual->getTimestamp() . "\n";

foreach ($period as $p) {
        // work around getTimestamp modifying date http://bugs.php.net/bug.php?id=52454
        $timestamp = $p->getTimestamp();
        echo 'From DatePeriod: ' . $timestamp . ', ';
        $tmp = new Datetime('@' . $timestamp);
        echo 'which is really: ' . $tmp->format('Y-m-d H:i:s') . ', ' . $tmp->getTimezone()->getName() . "\n";
}


Expected result:
----------------
We should get:   1289462400
Manually adding: 1289462400
From DatePeriod: 1289376000, which is really: 2010-11-10 08:00:00, +00:00
From DatePeriod: 1289462400, which is really: 2010-11-11 08:00:00, +00:00
From DatePeriod: 1289548800, which is really: 2010-11-12 08:00:00, +00:00
From DatePeriod: 1289635200, which is really: 2010-11-13 08:00:00, +00:00


Actual result:
--------------
We should get:   1289462400
Manually adding: 1289462400
From DatePeriod: 1289376000, which is really: 2010-11-10 08:00:00, +00:00
From DatePeriod: 1289548800, which is really: 2010-11-12 08:00:00, +00:00
From DatePeriod: 1289635200, which is really: 2010-11-13 08:00:00, +00:00
From DatePeriod: 1289721600, which is really: 2010-11-14 08:00:00, +00:00