// Add 1 to the number of views of this topic.
if (empty($_SESSION['last_read_topic']) || $_SESSION['last_read_topic'] != $topic)
{
db_query("
UPDATE {$db_prefix}topics
SET numViews = numViews + 1
WHERE ID_TOPIC = $topic
LIMIT 1", __FILE__, __LINE__);
$_SESSION['last_read_topic'] = $topic;
}