php catch mysqli connect 28 29 3a 28hy000 2f1045 29 3a access denied

1$conn = mysqli_connect( '<server>', '<username>', '<password>',  '<database-name>');
2if (!$conn) {
3  // whatever processing you want to do upon error in connection
4  // like log error or send an email to admin
5  // I am just printing the error at the moment.
6  echo mysqli_connect_errno() . ":" . mysqli_connect_error();
7  exit;
8}
9