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1- Create folder "Helpers" in app/Helpers

2- Create sample helper file app/Helpers/mysite_helper.php

3- Add Hellper provider file in "config/app.php" in providers array
App\Providers\HelpersProvider::class,

<?php
function base_url()
{return env('APP_URL');}

4- Create File app/Providers/HelpersProvider.php
 // Code 

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class HelpersProvider extends ServiceProvider
{

    public function boot()
    {
        //
    }
    public function register()
    {
        require_once app_path() . '/Helpers/mysite_helper.php';
    }
}