public static function findComments($storyId, $limit = 5, $afterId = null)
{
$storyComments = isset(self::$storyComments[$storyId]) ? self::$storyComments[$storyId] : [];
$start = isset($after) ? (int) array_search($afterId, $storyComments) + 1 : 0;
$storyComments = array_slice($storyComments, $start, $limit);
return array_map(function ($commentId) {
return self::$comments[$commentId];
}, $storyComments);
}