Solution

One way to do this is to create a class and use its instance, this way you can not only access the object of the class within a controller, blade, or any other class as well.

AppHelper file

In you app folder create a folder named Helpers and within it create a file name AppHelper or any of your choice

<?php
namespace App\Helpers;

class AppHelper
{
      public function bladeHelper($someValue)
      {
             return "increment $someValue";
      }

     public function startQueryLog()
     {
           \DB::enableQueryLog();
     }

     public function showQueries()
     {
          dd(\DB::getQueryLog());
     }

     public static function instance()
     {
         return new AppHelper();
     }
}

Usage

In a controller

When in a controller you can call the various functions

public function index()
{
    //some code

   //need to debug query
   \App\Helpers\AppHelper::instance()->startQueryLog();

   //some code that executes queries
   \App\Helpers\AppHelper::instance()->showQueries();
}

In a blade file

Say you were in a blade file, here is how you can call the app blade helper function

some html code
{{ \App\Helpers\AppHelper::instance()->bladeHelper($value) }}
and then some html code

Reduce the overhead of namespace (Optional)

You can also reduce the overhead of call the complete function namespace \App\Helpers by creating alias for the AppHelper class in config\app.php

'aliases' => [
       ....
       'AppHelper' => App\Helpers\AppHelper::class
 ]

and in your controller or your blade file, you can directly call

\AppHelper::instance()->functioName();