Add Helper Service Provider in Laravel

Helpers>AssetHelper.php

<?php

// store file and absolute url link generator
if (!function_exists('dynamic_asset')){
    function dynamic_asset($link){
        // if absolute url
        if (!$link){
            return asset(config('asset.default_author_thumbnail'));
        } else if (\Illuminate\Support\Str::startsWith($link, ['http://', 'https://'])){
            return $link;
        }else{
            return \Illuminate\Support\Facades\Storage::url($link);
        }
    }
}

Helpers>PaginatorHelper.php

<?php

if (! function_exists('paginateSerial')){
    //get the serial number of pagination
    function paginatedSerial($data)
    {
        return $data->perPage() * ($data->currentPage() - 1);
    }
}

HelperServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class HelperServiceProvider extends ServiceProvider
{
    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {
        // require all php files in Helpers directory
        foreach (glob(app_path().'/Helpers/*.php') as $filename){
            require_once($filename);
        }
    }

    /**
     * Bootstrap services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }
}