Update FansService.php

app/wechat/service/FansService.php

@@ -36,11 +36,11 @@ class FansService extends Service
      */
     public function set(array $user, string $appid = '')
     {
-        if (!empty($user['subscribe_time'])) {
+        if (isset($user['subscribe_time'])) {
             $user['subscribe_at'] = date('Y-m-d H:i:s', $user['subscribe_time']);
         }
         if (isset($user['tagid_list']) && is_array($user['tagid_list'])) {
-            $user['tagid_list'] = is_array($user['tagid_list']) ? join(',', $user['tagid_list']) : '';
+            $user['tagid_list'] = arr2str($user['tagid_list'] ?? []);
         }
         if ($appid !== '') $user['appid'] = $appid;
         unset($user['privilege'], $user['groupid']);