<?php
/**
 * Lang_detect Class
 *
 * Language detection library for CodeIgniter.
 *
 * @author        La2ha
 * @version       1.0
 * @link          http://la2ha.ru/dev/web/php/codeigniter/libraries_helpers/lang_detect
 */
class LangDetect
{
    var $language = null;


    public function __construct()
    {
        if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) and ($list = strtolower($_SERVER['HTTP_ACCEPT_LANGUAGE']))) {
            if (preg_match_all('/([a-z]{1,8}(?:-[a-z]{1,8})?)(?:;q=([0-9.]+))?/', $list, $list)) {
                $this->language = array_combine($list[1], $list[2]);
                foreach ($this->language as $n => $v)
                    $this->language[$n] = $v ? $v : 1;
                arsort($this->language, SORT_NUMERIC);
            }
        } else $this->language = array();
    }

    public function getBestMatch($default, $langs)
    {
        $languages=array();
        foreach ($langs as $lang => $alias) {
            if (is_array($alias)) {
                foreach ($alias as $alias_lang) {
                    $languages[strtolower($alias_lang)] = $lang;
                }
            }else $languages[strtolower($alias)]= $lang;
        }
        foreach ($this->language as $l => $v) {
            $s = strtok($l, '-'); // убираем то что идет после тире в языках вида "en-us, ru-ru"
            if (isset($languages[$s]))
                return $languages[$s];
        }
        return $default;
    }


}