Fatal error: Uncaught ValueError: array_rand(): Argument #1 ($array) cannot be empty in /www/wwwroot/api.xiaochetongxue.cn/api/mn.php:21 Stack trace: #0 /www/wwwroot/api.xiaochetongxue.cn/api/mn.php(21): array_rand() #1 {main} thrown in /www/wwwroot/api.xiaochetongxue.cn/api/mn.php on line 21