Add helper as a ServiceProvider , for example AppServiceProvider ! Then you can register your helper file throw the register function ! Let me show you the way !

1, create your helper function :
create floder ‘Helpers’ in ‘app’ , then add a file name myHelper.php widthin content :

if (! function_exists('myHelperFunc')) {
	
	function myHelperFunc($text){

		return "myHelperFunc";
	}
}

2, create helper provider :
add a file name HelperServiceProvider.php in ‘app/Providers’ widthin content :

namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class HelperServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        foreach (glob(app_path().'/Helpers/*.php') as $filename){
            require_once($filename);
        }
    }
}

3, auto load your helper provider
add one line to ‘config/app.php’ file , near ‘App\Providers\AppServiceProvider::class’ :

App\Providers\HelperServiceProvider::class

4, OK , you can use your helper function myHelperFunc now, just check by yourself