php怎么调试接口多语言_php接口多语言支持与语言包调试方法

$lang = $_GET['lang'] ?? $_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? 'en';
$lang = substr($lang, 0, 2); // 提取前两位，如 en、zh
error_log("Detected language: " . $lang); // 记录日志便于调试

// lang/zh.php
return [
    'welcome' => '欢迎使用系统',
    'error_not_found' => '未找到资源',
];

// lang/en.php
return [
    'welcome' => 'Welcome to the system',
    'error_not_found' => 'Resource not found',
];

$langFile = __DIR__ . "/lang/{$lang}.php";
if (file_exists($langFile)) {
    $translations = require $langFile;
} else {
    $translations = require __DIR__ . '/lang/en.php'; // 默认英文
}

function __($key, $lang = 'en') {
    static $cache = [];
    if (!isset($cache[$lang])) {
        $file = __DIR__ . "/lang/{$lang}.php";
        $cache[$lang] = file_exists($file) ? require $file : [];
    }
    return $cache[$lang][$key] ?? $key; // 若无翻译则返回 key（便于发现遗漏）
}

$lang = $_GET['lang'] ?? 'en';
echo json_encode([
    'message' => __('welcome', $lang),
    'status' => 'success'
]);