public static function lastActive()
    {
        $last = Podium::getInstance()->podiumCache->get('forum.lastactive');
        if ($last === false) {
            $time = time() - 15 * 60;
            $last = [
                'count' => static::find()->where(['>', 'updated_at', $time])->count(),
                'members' => static::find()->where(['and',
                        ['>', 'updated_at', $time],
                        ['is not', 'user_id', null],
                        ['anonymous' => 0]
                    ])->count(),
                'anonymous' => static::find()->where(['and',
                        ['>', 'updated_at', $time],
                        ['is not', 'user_id', null],
                        ['anonymous' => 1]
                    ])->count(),
                'guests' => static::find()->where(['and',
                        ['>', 'updated_at', $time],
                        ['user_id' => null]
                    ])->count(),
                'names' => [],
            ];
            $members = static::find()->where(['and',
                    ['>', 'updated_at', $time],
                    ['is not', 'user_id', null],
                    ['anonymous' => 0]
                ]);
            foreach ($members->each() as $member) {
                $last['names'][$member->user_id] = [
                    'name' => $member->username,
                    'role' => $member->user_role,
                    'slug' => $member->user_slug,
                ];
            }
            Podium::getInstance()->podiumCache->set('forum.lastactive', $last, 60);
        }
        return $last;
    }