php artisan config:cache 执行这句命令产生的
php artisan config:clear 清除一下
https://laravel-china.org/articles/4809/note-that-laravel-clears-cache-php-artisan-cacheclear-usage
这个php artisan cache:clear 坑有点儿大啊，大家小心一点，
修改方案：
https://laravel-china.org/topics/2466/laravel-configuration-under-the-redis-so-that-the-cache-session-each-use-a-different-redis-database