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