laravel - Move app to another server, blank page and artisan error

I need to move app in laravel from web server to local sever (I trying on XAMPP). I moved all files, database and in files I changed URI in:
/index.php

<? header("Location: http://localhost/public"); ?>

but I get errors in:

• On http://localhost/ I have blank page
• On http://localhost/public and every another route I getting error: http://ift.tt/2aKf93H

• When I use php artisan or another commands I getting error:

  [ErrorException] Undefined index: HTTP_USER_AGENT

I forgot about somethink?

via Chebli Mohamed