lang_env.php

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<?php

$lang_translation=array( # If you comment lang here, it won't be displayed. 
            "fr_FR" => "Français",
            "en_US" => "English",
#           "es_ES" => "Español",
#           "it_IT" => "Italiano",
#           "de_DE" => "Deutsch",
#           "pt_BR" => "Portuguese",
            "nl_NL" => "Dutch",
            );

global $arr_lang_translation ;
$arr_lang_translation = $lang_translation; // not pretty but I don't want side effect right now

function update_locale($langpath) {
  global $arr_lang_translation;
  $locales=array();
  $file=file("/etc/locale.gen", FILE_SKIP_EMPTY_LINES);
  if (! is_array($file) ) return $locales;
  foreach ($file as $v ) {
    if ( (preg_match("/^([a-z][a-z]_[A-Z][A-Z])/",trim($v),$mat) && file_exists($langpath . '/' . $mat[1]) ) ) {
      if (! array_key_exists($mat[1], $arr_lang_translation) ) continue;
      $locales[$mat[1]]=$mat[1];
    }
  }
  if (!count($locales)) {
    $locales=array("en_US"=>"en_US");
  }
  return $locales;
}

// setlang is on the link at the login page
if (isset($_REQUEST["setlang"])) {
  $lang=$_REQUEST["setlang"];
  $setlang=$_REQUEST["setlang"];
} elseif (isset($_COOKIE['lang'])) {
  $lang=$_COOKIE['lang'];
}

$langpath = bindtextdomain("alternc", ALTERNC_LOCALES);

// Create or update a locale.php file if it is outdated.
$locales = update_locale($langpath);

// Default to en_US : 
if (!isset($_SERVER["HTTP_ACCEPT_LANGUAGE"])) {
  $_SERVER["HTTP_ACCEPT_LANGUAGE"]="en_US";
}

if (!(isset($lang))) {  // Use the browser first preferred language
  $lang=strtolower(substr(trim($_SERVER["HTTP_ACCEPT_LANGUAGE"]),0,5));
}


if (! isset($locales[$lang])) { // Requested language not found in locales
  // treat special cases such as en_AU or fr_BF : use the language only, not the country.
  $ll=substr($lang,0,2);
  foreach($locales as $l) {
    if (substr($l,0,2)==$ll) {
      $lang=$l;
      break;
    }
  }
}

if (!isset($locales[$lang])) list($lang)=each($locales);

if (isset($setlang) && isset($lang)) {
  setcookie("lang",$lang);
}

// User chose a non existent language, select the first available one 
if ($lang == NULL) {
  $lang = "en_US";
}

/* Language ok, set the locale environment */
putenv("LC_MESSAGES=".$lang);
putenv("LANG=".$lang);
putenv("LANGUAGE=".$lang);
// this locale MUST be selected in "dpkg-reconfigure locales"
setlocale(LC_ALL,$lang); 
textdomain("alternc");

$empty="";
if (_($empty) && preg_match("#charset=([A-Za-z0-9\.-]*)#",_($empty),$mat)) {
  $charset=$mat[1];
 }
if (! isset($charset) || !$charset) $charset="UTF-8";
bind_textdomain_codeset("alternc","$charset");

?>