- $lang_list = [];
-
- if (!empty($_SERVER['HTTP_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', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $lang_parse);
-
- if (count($lang_parse[1])) {
- // go through the list of prefered languages and add a generic language
- // for sub-linguas (e.g. de-ch will add de) if not already in array
- for ($i = 0; $i < count($lang_parse[1]); $i++) {
- $lang_list[] = strtolower($lang_parse[1][$i]);
- if (strlen($lang_parse[1][$i])>3) {
- $dashpos = strpos($lang_parse[1][$i], '-');
- if (!in_array(substr($lang_parse[1][$i], 0, $dashpos), $lang_list)) {
- $lang_list[] = strtolower(substr($lang_parse[1][$i], 0, $dashpos));
- }
- }
- }
- }
- }
-
- if (isset($_GET['lang'])) {
- $lang_list = [$_GET['lang']];
- }
-
- // check if we have translations for the preferred languages and pick the 1st that has
- foreach ($lang_list as $lang) {
- if ($lang === 'en' || (file_exists("view/lang/$lang") && is_dir("view/lang/$lang"))) {
- $preferred = $lang;
- break;
- }
- }
- if (isset($preferred)) {
- return $preferred;