PHP如何获取系统语言设置 系统语言获取技巧实现多语言适配

<?php

function getPreferredLanguage() {
    if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
        $languages = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
        $preferredLanguage = null;
        $maxQuality = 0;

        foreach ($languages as $language) {
            $language = trim($language);
            // 提取语言代码和质量值
            if (strpos($language, ';') !== false) {
                list($langCode, $qualityStr) = explode(';', $language, 2);
                if (strpos($qualityStr, 'q=') === 0) {
                    $quality = (float)substr($qualityStr, 2);
                } else {
                    $quality = 1.0; // 默认质量值
                }
            } else {
                $langCode = $language;
                $quality = 1.0; // 默认质量值
            }

            if ($quality > $maxQuality) {
                $maxQuality = $quality;
                $preferredLanguage = $langCode;
            }
        }

        return $preferredLanguage;
    }
    return 'en-US'; // 默认语言
}

$lang = getPreferredLanguage();
echo "Preferred Language: " . $lang;

?>

// en.php
<?php
return [
    'welcome_message' => 'Welcome',
    'goodbye_message' => 'Goodbye',
];
?>

// zh-CN.php
<?php
return [
    'welcome_message' => '欢迎',
    'goodbye_message' => '再见',
];
?>

<?php
$lang = getPreferredLanguage(); // 获取用户首选语言

$langFile = __DIR__ . '/languages/' . $lang . '.php';

if (file_exists($langFile)) {
    $translations = include $langFile;
} else {
    $translations = include __DIR__ . '/languages/en-US.php'; // 加载默认语言
}

function translate($key) {
    global $translations;
    return isset($translations[$key]) ? $translations[$key] : $key; // 如果找不到翻译，返回原始键
}

echo translate('welcome_message'); // 输出欢迎信息
?>

<?php

function loadLanguageFile($lang) {
    $langFile = __DIR__ . '/languages/' . $lang . '.php';
    if (file_exists($langFile)) {
        return include $langFile;
    }
    return null;
}

$lang = getPreferredLanguage();

$translations = loadLanguageFile($lang);

// 尝试回退到更通用的语言
if (!$translations) {
    $parts = explode('-', $lang);
    if (count($parts) > 1) {
        $genericLang = $parts[0]; // 例如，从zh-Hans-CN提取zh
        $translations = loadLanguageFile($genericLang);
    }
}

// 如果仍然找不到，加载默认语言
if (!$translations) {
    $translations = include __DIR__ . '/languages/en-US.php';
}

function translate($key) {
    global $translations;
    return isset($translations[$key]) ? $translations[$key] : $key;
}

echo translate('welcome_message');
?>

<?php

$locale = getPreferredLanguage(); // 获取用户首选语言，例如 'de-DE'

$date = new DateTime();

$formatter = new IntlDateFormatter($locale, IntlDateFormatter::FULL, IntlDateFormatter::NONE);
echo $formatter->format($date); // 输出本地化的日期格式，例如 "Montag, 15. April 2024"

$number = 1234.56;
$formatter = new NumberFormatter($locale, NumberFormatter::CURRENCY);
echo $formatter->formatCurrency($number, 'EUR'); // 输出本地化的货币格式，例如 "1.234,56 €"

?>