Getting a users username in get_user_meta

The username is not a user meta entry, so you’ll probably want to work with a WP_User object instead:

$user = get_user_by( 'id', $_uid );
echo $user->user_login;

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)