+ /**
+ * Returns a list of the most frequent global hashtags over the given period
+ *
+ * @param int $period Period in hours to consider posts
+ * @return array
+ * @throws \Exception
+ */
+ public static function getGlobalTrendingHashtags(int $period, $limit = 10)
+ {
+ $tags = DI::cache()->get('global_trending_tags');
+
+ if (!$tags) {
+ $tagsStmt = DBA::p("SELECT t.`term`, COUNT(*) AS `score`
+ FROM `term` t
+ JOIN `item` i ON i.`id` = t.`oid` AND i.`uid` = t.`uid`
+ JOIN `thread` ON `thread`.`iid` = i.`id`
+ WHERE `thread`.`visible`
+ AND NOT `thread`.`deleted`
+ AND NOT `thread`.`moderated`
+ AND `thread`.`private` = ?
+ AND t.`uid` = 0
+ AND t.`otype` = ?
+ AND t.`type` = ?
+ AND t.`term` != ''
+ AND i.`received` > DATE_SUB(NOW(), INTERVAL ? HOUR)
+ GROUP BY `term`
+ ORDER BY `score` DESC
+ LIMIT ?",
+ Item::PUBLIC,
+ Term::OBJECT_TYPE_POST,
+ Term::HASHTAG,
+ $period,
+ $limit
+ );
+
+ if (DBA::isResult($tagsStmt)) {
+ $tags = DBA::toArray($tagsStmt);
+ DI::cache()->set('global_trending_tags', $tags, Duration::HOUR);
+ }
+ }
+
+ return $tags ?: [];
+ }
+
+ /**
+ * Returns a list of the most frequent local hashtags over the given period
+ *
+ * @param int $period Period in hours to consider posts
+ * @return array
+ * @throws \Exception
+ */
+ public static function getLocalTrendingHashtags(int $period, $limit = 10)
+ {
+ $tags = DI::cache()->get('local_trending_tags');
+
+ if (!$tags) {
+ $tagsStmt = DBA::p("SELECT t.`term`, COUNT(*) AS `score`
+ FROM `term` t
+ JOIN `item` i ON i.`id` = t.`oid` AND i.`uid` = t.`uid`
+ JOIN `thread` ON `thread`.`iid` = i.`id`
+ WHERE `thread`.`visible`
+ AND NOT `thread`.`deleted`
+ AND NOT `thread`.`moderated`
+ AND `thread`.`private` = ?
+ AND `thread`.`wall`
+ AND `thread`.`origin`
+ AND t.`otype` = ?
+ AND t.`type` = ?
+ AND t.`term` != ''
+ AND i.`received` > DATE_SUB(NOW(), INTERVAL ? HOUR)
+ GROUP BY `term`
+ ORDER BY `score` DESC
+ LIMIT ?",
+ Item::PUBLIC,
+ Term::OBJECT_TYPE_POST,
+ Term::HASHTAG,
+ $period,
+ $limit
+ );
+
+ if (DBA::isResult($tagsStmt)) {
+ $tags = DBA::toArray($tagsStmt);
+ DI::cache()->set('local_trending_tags', $tags, Duration::HOUR);
+ }
+ }
+
+ return $tags ?: [];
+ }
+