lbry.com/lib/i18n.class.php

<?php

/**
 * i18n dummy we'll be happy to have later
 */
function __($msg, $args = [])
{
  return strtr(i18n::translate($msg), $args);
}

class i18n
{
  protected static
    $language = null,
    $translations = [],
    $country = null,
    $cultures = ['pt_PT', 'en_US'];

  public static function register() /*needed to trigger class include, presumably setup would happen here*/
  {
    $culture = static::deduceCulture();

    list($language, $country) = explode('_', $culture);
    static::$language = $language;
    static::$country  = $country;

    setlocale(LC_MONETARY, $culture . '.UTF-8');
  }

  public static function getLanguage()
  {
    return static::$language;
  }

  public static function getCountry()
  {
    return static::$country;
  }

  public static function getAllCultures()
  {
    return static::$cultures;
  }

  public static function formatCurrency($amount, $currency = 'USD')
  {
    return '<span class="formatted-currency">' . money_format('%.2n', $amount) . '</span>';
  }

  public static function formatCredits($amount)
  {
    return '<span class="formatted-credits">' . (is_numeric($amount) ? number_format($amount, 1) : $amount) . ' LBC</span>';
  }

  public static function translate($token, $language = null)
  {
    $language = $language === null ? static::$language : $language;
    if (!isset(static::$translations[$language]))
    {
      $path = ROOT_DIR . '/data/i18n/' . $language . '.yaml';

      static::$translations[$language] = file_exists($path) ? Spyc::YAMLLoadString(file_get_contents($path)) : [];
    }
    $scope = static::$translations[$language];
    foreach (explode('.', $token) as $level)
    {
      if (isset($scope[$level]))
      {
        $scope = $scope[$level];
      }
      else
      {
        $scope = [];
      }
    }
    if (!$scope && $language != 'en')
    {
      return static::translate($token, 'en');
    }
    return $scope ?: $token;
  }

  protected static function deduceCulture()
  {
    $candidates = [];

    //url trumps everything
    $urlTokens = Request::getHost() ? explode('.', Request::getHost()) : [];
    $code      = $urlTokens ? reset($urlTokens) : null;
    if ($code !== 'www')
    {
      $candidates[] = $code;
    }

    //then session
    $candidates[] = Session::get(Session::KEY_USER_CULTURE);

    // then headers
    // http://www.thefutureoftheweb.com/blog/use-accept-language-header
    if (Request::getHttpHeader('Accept-Language'))
    {
      // break up string into pieces (languages and q factors)
      preg_match_all('/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0\.[0-9]+))?/i', Request::getHttpHeader('Accept-Language'), $languages);

      if (isset($languages[1]) && count($languages[1]))
      {
        // create a list like "en" => 0.8
        $langs = array_combine($languages[1], $languages[4]);

        // set default to 1 for any without q factor
        foreach ($langs as $lang => $val)
        {
          if ($val === '')
          {
            $langs[$lang] = 1;
          }
        }

        arsort($langs, SORT_NUMERIC);

        $candidates = array_merge($candidates, array_keys($langs));
      }
    }

    foreach ($candidates as $candidate)
    {
      foreach (static::getAllCultures() as $culture)
      {
        if ($candidate === $culture || substr($culture, 0, 2) === $candidate)
        {
          return $culture;
        }
      }
    }

    return 'en_US';
  }
}