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[Felix Riesterer]

Liebe(r) Carmen,

Deine Implementierung der Content-Negotiation ist nicht sonderlich flexibel. Möchtest Du das nicht mit etwas mehr Funktionalität haben?

Als Merzedes unter solchen Lösungen kann man diese PHP-Klasse empfehlen: Content Negotiation tools for PHP

In meinem Projekt verwende ich diese Funktion zum Erkennen der gewünschten Sprache:

/**
 * language negotiation
 *
 * @param array $allowed set of allowed or available languages
 * @param string $default language to be used as default
 * @param bool $strict_mode don't lower-case language parameters
 *
 * @return string final choice for language
 */
function get_http_lang ($allowed, $default, $strict_mode = true) {
  // split header
  $accepted_languages = preg_split('~,\s*~', $_SERVER['HTTP_ACCEPT_LANGUAGE']);

  // set standard values
  $current_lang = $default;
  $current_q = 0;

  // process all allowed languages
  foreach ($accepted_languages as $accepted) {
    // get all available information about each language
    $res = preg_match(
      '/^([a-z]{1,8}(?:-[a-z]{1,8})*)(?:;\s*q=(0(?:\.[0-9]{1,3})?|1(?:\.0{1,3})?))?$/i',
      $accepted,
      $matches
    );

    // syntax valid?
    if (!$res) {
      // no? ignore
      continue;
    }

    // get language code and split into individual parts
    $lang_code = explode('-', $matches[1]);

    // quality provided?
    if (isset($matches[2])) {
      // use quality
      $lang_quality = (float) $matches[2];
    } else {
      // compatibility mode: assume a quality of 1
      $lang_quality = 1.0;
    }

    // until code has been fully used...
    while (count($lang_code)) {
      // is language among allowed languages?
      if (in_array(strtolower (join ('-', $lang_code)), $allowed)) {
        // test quality
        if ($lang_quality > $current_q) {
          // use this language
          $current_lang = strtolower(join('-', $lang_code));
          $current_q = $lang_quality;
          // leave inner while loop
          break;
        }
      }

      // don't minimize language when in strict mode
      if ($strict_mode) {
        // break inner while loop
        break;
      }

      // cut right-most part
      array_pop($lang_code);
    }
  }

  return $current_lang;
}

Liebe Grüße,

Felix Riesterer.