service-captcha/app/Helpers/Helpers.php

<?php declare(strict_types=1);

namespace App\Helpers;

use App\Models\User;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Collection;

final readonly class Helpers
{
    public static function getTimeZoneList(): Collection
    {
        return Cache::rememberForever('timezones_list_collection', function () {
            $timezone = [];
            foreach (timezone_identifiers_list(\DateTimeZone::ALL) as $key => $value) {
                $timezone[$value] = $value . ' (UTC ' . now($value)->format('P') . ')';
            }
            return collect($timezone)->sortKeys();
        });
    }

    public static function getUserTimeZone() {
        return auth()->user()?->timezone ?? config('app.user_timezone');
    }

    public static function isDemoMode(): bool
    {
        return config('app.demo_mode', false);
    }

    public static function isDemoModeAndUserDenyUpdate(User $user): bool
    {
        if (self::isDemoMode() !== true) {
            return false;
        }

        return $user->email === config('app.demo_email');
    }
}