I've just installed Symfony 2.7.
I've started my app from the command line with:
$ php app/console server:run
I installed XAMPP to run PHP.
The following pictures show my localhost:8000/config.php and localhost:8000 pages.
Config ! Main page !
EXACT SOLUTION:
_blog:
path: /
defaults: { _controller: AppBundle:Default:index }
Where:
path points to localhost:8000
defults: executes the indexAction method in the file "blog\src\AppBundle\Controller\DefaultController.php" (the file was in my project's file system by default, so for a different controller, replace this file to to your own)