Comments by New-comer!!! (Top 3 by date)

Thanks for yor comment! I will take that in mind. However, it still cannot solve the problem that I cannot return the error message after changing my password to test the accessibility to my database. Can you pls comment about this?

Thx for your comment. Even I commented out $mysql, below 2 functoins should be able to show the error as I added die(mysqli_error). I tried your method and uncomment the $sql, it is still the same without response. Can you pls take a look again? Thx!

$conn = mysqli_connect('localhost', 'root', 'ddddddd') or die(mysqli_error()); //Databased connection
$db_select = mysqli_select_db($conn, 'my_db') or die(mysqli_error()); //Selectionn of database