chamilo-lms/custompages/language.php

<?php
/* For licensing terms, see /license.txt */
/**
 * Definition of language-related functions for cases where th user isn't
 * logged in yet
 * @package chamilo.custompages
 */
/**
 * Get the preferred language base on the browser headers
 */
function get_preferred_language($available_langs) {
	$langs = array();
	foreach (explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']) as $httplang) {
		$rawlang = explode(';q=', $httplang);
		if (strpos($rawlang[0], '-') !== FALSE) {
			$rawlang[0] = substr($rawlang[0], 0, strpos($rawlang[0], '-'));
		}
		if (count($rawlang) == 1) {
			$rawlang[1] = 1.0;
		}
		$langs[$rawlang[1]] = $rawlang[0];
	}
	krsort($langs, SORT_NUMERIC);
	foreach($langs as $weight => $code) {
		if (in_array($code, $available_langs)) {
			return $code;
		}
	}
	return null;
}
/**
 * Get a language variable in a specific language
 */
function custompages_get_lang($variable) {
	return get_lang($variable, null, $_SESSION['user_language_choice']);
}

$available_langs = array('en', 'fr', 'es', 'gl', 'eu');
$chamilo_langs = array(
    null => 'english',
    'en' => 'english',
    'fr' => 'french',
    'nl' => 'dutch',
    'de' => 'german',
    'es' => 'spanish',
    'gl' => 'galician',
    'eu' => 'basque'
);
$lang_match = $chamilo_langs[get_preferred_language($available_langs)];
// recover previous value ...
if (isset($_SESSION['user_language_choice']))
	$lang_match = $_SESSION['user_language_choice'];

// Chamilo parameter, on logout
if (isset($_REQUEST['language']) && !empty($_REQUEST['language']) && in_array($_REQUEST['language'], $chamilo_langs)) {
	$lang_match = $_REQUEST['language'];
}
// Incoming link parameter
if (isset($_REQUEST['lang']) && !empty($_REQUEST['lang']) && in_array($_REQUEST['lang'], $available_langs)) {
	$lang_match = $chamilo_langs[$_REQUEST['lang']];
}

$detect = api_get_setting('auto_detect_language_custom_pages');
if ($detect === 'true') {
    // Auto detect
    $_user['language'] = $lang_match;
    $_SESSION['user_language_choice'] = $lang_match;
} else {
    // Chamilo default platform.
    $defaultLanguage = api_get_interface_language();
    $_user['language'] = $defaultLanguage;
    $_SESSION['user_language_choice'] = $defaultLanguage;
}