investbrain/app/Providers/AppServiceProvider.php

<?php

declare(strict_types=1);

namespace App\Providers;

use Illuminate\Http\Resources\Json\JsonResource;
use Illuminate\Support\Arr;
use Illuminate\Support\Number;
use Illuminate\Support\ServiceProvider;
use NumberFormatter;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     */
    public function register(): void
    {
        $this->app->bind(
            \App\Interfaces\MarketData\MarketDataInterface::class,
            \App\Interfaces\MarketData\FallbackInterface::class
        );
    }

    /**
     * Bootstrap any application services.
     */
    public function boot(): void
    {
        JsonResource::withoutWrapping();

        Arr::macro('skipEmptyValues', function (array $array) {

            return Arr::mapWithKeys($array, function (mixed $value, mixed $key) {
                $result = [];
                if (! empty($value)) {
                    $result[$key] = $value;
                }

                return $result;
            });
        });

        Number::macro('currencySymbol', function (?string $currency = null, ?string $locale = null) {

            $currency = $currency ?? Number::defaultCurrency();

            $locale = $locale ?? Number::defaultLocale();

            $formatter = new NumberFormatter($locale."@currency=$currency", NumberFormatter::CURRENCY);

            return $formatter->getSymbol(NumberFormatter::CURRENCY_SYMBOL);
        });
    }
}