public function setLastPostCache()
{
$lastTopic = $this->lastTopic(false);
if ($lastTopic === null) {
$this->forum_last_post_id = null;
$this->forum_last_post_time = null;
$this->forum_last_post_subject = null;
$this->forum_last_poster_id = null;
$this->forum_last_poster_name = null;
$this->forum_last_poster_colour = null;
} else {
$this->forum_last_post_id = $lastTopic->topic_last_post_id;
$this->forum_last_post_time = $lastTopic->topic_last_post_time;
$this->forum_last_post_subject = $lastTopic->topic_title;
$this->forum_last_poster_id = $lastTopic->topic_last_poster_id;
$this->forum_last_poster_name = $lastTopic->topic_last_poster_name;
$this->forum_last_poster_colour = $lastTopic->topic_last_poster_colour;
}
}