Installing Drupal

I'm in the proccess of installing Drupal 8 for this first time. I have everything setup except the settings.php file.

I've copied the default.settings.php and then go to run the install script. However, I keep getting the error:

Catchable fatal error: Argument 3 passed to Drupal\Core\Database\Database::addConnectionInfo() must be of the type array, string given, called in /core/lib/Drupal/Core/Database/Database.php on line 295 and defined in /core/lib/Drupal/Core/Database/Database.php on line 256

I'm helping my friend to restore the site after the hack that messed a lot.
I have database and all the files but if I replace on fresh install
database then content shows but admin page says error 403 and
main page is asking for user/password. If files are overwritten then

Fatal error: Call to undefined function menu_execute_active_handler() in index.php on line 21

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I just want to restore content and graphics, all the modules/themes/users I can configure once again if admin page is accessible.

Salve sono alle prime armi ho istallato drupal 7.43 tutto a posto ho istallato vari moduli tutto ok.
dalla sera alla mattina mi collego al sito e non mi riconosce più come amministratore e non mi fa più entrare come faccio, il sito è in locale,dovrei entrare nella pagina amministratore per vedere cosa è successo ma come faccio.
vi ringrazio anticipatamente
Cordiali saluti.
http://ilpassatempomoderno.altervista.org/portale/?q=admin

Hey all,

I am beginning the long journey to my first Drupal site. My company deals with lot's of granular data (weights, dimensions, materials, cycle times, feed rates, etc) - so, after research, Drupal seemed like a natural fit.

I have worked in Joomla since the mid 2006ish and Wordpress since 2010. I understand Drupal is a much more complex animal - but figured I would catch on to the learning curve at some point.

The problem, though, seems to be getting out of the starting gate.

Hello (sorry for mu english),

I use flag and dialog in a modale windows for inscription in an event.
It's ok. In a form, i ask differents fields and user this fields in a private module.
All is effective, even the modal dialog (flag dialog, with a dialog form).

But few days ago, I change in my site with new version of flag and dialog. i add jquery_update for that, with 1.10 version.
And with this dialog, no AJAX !

And when i add this in my template (drupal_add_library('system', 'drupal.ajax');),
now i have an error message :

Migration from a webhost to another, both shared hosting:

• download db via module "backup and migrate" (no access to phpadmin on old server)
• download code via FTP (windows7 client)
• upload db via phpmyadmin on new server
• upload code via FTP
• settings updated to reflect (new) db name and db user
• field "maintenance_mode" in table "variable" changed to 0 (1 = offline) via phpmyadmin

Result: the home page is displayed correctly, but login or another page results in 404.
Any idea where to look for the cause?