Warning: mysqli::mysqli(): (HY000/1045): Access denied for user 'root'@'localhost' (using password: NO) in C:\xampp\htdocs\rd\book.php on line 2

Warning: mysqli_set_charset(): Couldn't fetch mysqli in C:\xampp\htdocs\rd\book.php on line 3

Warning: mysqli::prepare(): Couldn't fetch mysqli in C:\xampp\htdocs\rd\book.php on line 6

Fatal error: Call to a member function bind_param() on null in C:\xampp\htdocs\rd\book.php on line 7