Notice: Undefined variable: course_type in C:\xampp\htdocs\index3.php on line 29
Notice: Undefined variable: mysqli in C:\xampp\htdocs\index3.php on line 32
Fatal error: Uncaught Error: Call to a member function prepare() on null in C:\xampp\htdocs\index3.php:32
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\index3.php on line 32