如何使用prinsfrank/standards解决多国标准数据管理的烦恼，提升PHP应用的健壮性

<code class="bash">composer require prinsfrank/standards</code>

<pre class="brush:php;toolbar:false;">use PrinsFrank\Standards\Country\CountryAlpha2;
use PrinsFrank\Standards\Currency\CurrencyAlpha3;

class OrderProcessor
{
    public function processOrder(CountryAlpha2 $country, CurrencyAlpha3 $currency, float $amount): string
    {
        // 这里的 $country 和 $currency 保证是有效的枚举实例
        // 无需额外的验证逻辑
        $countryName = $country->name; // 例如：Netherlands
        $currencySymbol = $currency->getSymbol()->value; // 例如：€

        // 进一步处理订单逻辑...
        return "Order for {$amount} {$currencySymbol} in {$countryName} processed.";
    }
}

$processor = new OrderProcessor();

// 有效调用
echo $processor->processOrder(CountryAlpha2::Netherlands, CurrencyAlpha3::Euro, 123.45);
// 输出：Order for 123.45 € in Netherlands processed.

// 尝试传入无效值，会在类型检查阶段就报错，而不是运行时
// $processor->processOrder('XX', 'YYY', 100.00); // Fatal error: Uncaught TypeError

<pre class="brush:php;toolbar:false;">use PrinsFrank\Standards\Country\CountryAlpha2;
use PrinsFrank\Standards\Language\LanguageAlpha2;

$country = CountryAlpha2::Netherlands;

echo "Alpha-2: " . $country->value . "\n"; // NL
echo "Alpha-3: " . $country->toCountryAlpha3()->value . "\n"; // NLD
echo "Numeric: " . $country->toCountryNumeric()->value . "\n"; // 528
echo "Calling Code: " . $country->getCountryCallingCodes()[0]->value . "\n"; // 31
echo "Flag Emoji: " . $country->getFlagEmoji() . "\n"; // ??

// 获取该国家使用的货币
foreach ($country->getCurrenciesAlpha3() as $currency) {
    echo "Currency: " . $currency->value . " (" . $currency->getSymbol()->value . ")\n";
}
// 输出：Currency: EUR (€)

// 获取该国家官方语言
foreach ($country->getOfficialAndDeFactoLanguages() as $language) {
    echo "Language: " . $language->value . "\n"; // nl
}

// 获取国家名称在不同语言下的显示
echo "Name in Dutch: " . $country->getNameInLanguage(LanguageAlpha2::Dutch_Flemish) . "\n"; // Nederland
echo "Name in English: " . $country->getNameInLanguage(LanguageAlpha2::English) . "\n";     // Netherlands

<pre class="brush:php;toolbar:false;">use PrinsFrank\Standards\Country\CountryAlpha2;
use PrinsFrank\Standards\Currency\CurrencyAlpha3;
use PrinsFrank\Standards\Language\LanguageAlpha2;

$amount = 42.42;
$currency = CurrencyAlpha3::Euro;
$country = CountryAlpha2::Netherlands;
$language = LanguageAlpha2::Dutch_Flemish;

echo $currency->format($amount, $country, $language); // 输出：€ 42,42