Warning: mysqli_connect(): (HY000/1045): Access denied for user 'username'@'localhost' (using password: YES)

Question

Warning: mysqli_connect(): (HY000/1045): Access denied for user \'username\'@\'localhost\' (using password: YES) in C:\\Users\\xampp\\htdocs\\PHP_Login_Script

Answer 1

Do you have two connections at the same time? If so, close every time you don't need it.

Answer 2

In my case the problem was:

define ('DB_PASSWORD', "MyPassw0rd!'");

(the odd single ' before the double ")

Answer 3

Not that anyone would ever have CAPS on when entering a password...but it can give this error.