Laravel : Access denied for user ''@'localhost' (using password: YES) after removing credentials from .env file

I have installed Laravel 6.0 and set up the database. Initially, it was working fine when I have put the database credentials in .env file but after removing it from .env file and setting up it in database.php file, I am getting this error.

Access denied for user ''@'localhost' (using password: YES)

What is wrong I am doing here?

Thanks J

via Chebli Mohamed