if ($post_id)
{
// See if user has already karmaed this post
$sql = 'SELECT post_id
FROM ' . KARMA_TABLE . '
WHERE post_id = ' . $post_id . '
AND poster_id = ' . $user->data['user_id'];
$result = $db->sql_query($sql);
if ($row = $db->sql_fetchrow($result))
{
trigger_error('KARMA_ALREADY_KARMAED_POST');
}
}