protected function getOpenSlot(&$comments, $postdate)
{
if (array_key_exists($postdate, $comments)) {
$parts = explode('.', $postdate, 2);
if (!array_key_exists(1, $parts)) {
$parts[1] = 0;
}
++$parts[1];
return $this->getOpenSlot($comments, implode('.', $parts));
}
return $postdate;
}