Merge pull request #5 from liyu001989/master

fix count problem in php 7.2

Author: summerblue

app/Models/Traits/ActiveUserHelper.php

@@ -64,7 +64,7 @@ private function calculateActiveUsers()
             $user = $this->find($user_id);
 
             // 如果数据库里有该用户的话
-            if (count($user)) {
+            if ($user) {
 
                 // 将此用户实体放入集合的末尾
                 $active_users->push($user);
@@ -113,4 +113,4 @@ private function cacheActiveUsers($active_users)
         // 将数据放入缓存中
         Cache::put($this->cache_key, $active_users, $this->cache_expire_in_minutes);
     }
-}
+}