Unable to connect to database - cannot find error messages

How do I connect to a DO managed MySQL DB from a PHP script using mysqli_connect ?

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

Hi!
Error
CodeIgniter\Database\Exceptions\DatabaseException Unable to connect to the database. Main connection [MySQLi]: No such file or directory

can appear in case when you have file .env also

but you are looking problem in app/Config/Database.php