In first example the `modify()` is calling the `modifyWebRouter()` and `modifyWebDispatcher()` .

modify-calling-dispatcher-and-router.php

<?php
namespace Aura\Framework_Project\_Config;

use Aura\Di\Config;
use Aura\Di\Container;

class Common extends Config
{
    public function define(Container $di)
    {
        // some definitions
    }

    public function modify(Container $di)
    {
        $this->modifyWebRouter($di);
        $this->modifyWebDispatcher($di);
    }

    public function modifyWebRouter(Container $di)
    {
        $router = $di->get('web_router');

        $router->add('hello', '/')
               ->setValues(array('controller' => 'hello'));

        $request = $di->get('web_request');
        $response = $di->get('web_response');

        $router
            ->add('blog.read', '/blog/read/{id}')
            ->addValues(array(
                'controller' => 'blog.read'
            ));
    }

    public function modifyWebDispatcher($di)
    {
        $dispatcher = $di->get('web_dispatcher');

        $dispatcher->setObject('hello', function () use ($di) {
            $response = $di->get('web_response');
            $response->content->set('Hello World!');
        });

        $dispatcher->setObject(
            'blog.read',
            $di->lazyNew('App\Actions\BlogRead')
        );
    }
}

one.php

<?php
namespace Aura\Framework_Project\_Config;

use Aura\Di\Config;
use Aura\Di\Container;

class Common extends Config
{
    public function define(Container $di)
    {
        // some definitions
    }

    public function modify(Container $di)
    {
        $router = $di->get('web_router');

        $router->add('hello', '/')
               ->setValues(array('controller' => 'hello'));

        $request = $di->get('web_request');
        $response = $di->get('web_response');

        $router
            ->add('blog.read', '/blog/read/{id}')
            ->addValues(array(
                'controller' => 'blog.read'
            ));

        $dispatcher = $di->get('web_dispatcher');

        $dispatcher->setObject('hello', function () use ($di) {
            $response = $di->get('web_response');
            $response->content->set('Hello World!');
        });

        $dispatcher->setObject(
            'blog.read',
            $di->lazyNew('App\Actions\BlogRead')
        );
    }
}