Warning: Undefined array key "user_id" in C:\xampp\htdocs\demo\manage\staff_manage.php on line 3

Fatal error: Uncaught Error: Undefined constant "position" in C:\xampp\htdocs\demo\manage\staff_manage.php:3 Stack trace: #0 {main} thrown in C:\xampp\htdocs\demo\manage\staff_manage.php on line 3