Fresh install of 5.6.4. Right after entering the database info, then deleting makeconfig.php, this error comes up:

Warning: Use of undefined constant MYSQLI_NUM - assumed 'MYSQLI_NUM' (this will throw an Error in a future version of PHP) in phar://C:/web/Apache24/htdocs/vB564/core/vb/vb.phar/db/mysql/assertor.php on line 44

A System Error has occured.

The software is experiencing a systems error.

You should attempt to repeat your last action. If this error occurs again, please contact the site administrator.

I repeat the last action, but with the same result.

What now?