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<?php
defined('_VALID') or die('Restricted Access!');
class VBrowser
{
    private static $__cache = array();
    public static function get($var)
    {
        if (isset(self::$__cache[$var])) {
            return self::$__cache[$var];
        }
        
        $info        = array();
        $user_agent    = VServer::get('HTTP_USER_AGENT');
        $browsers    = VF::cfg('library.mobile');
        foreach ($browsers as $agent => $name) {
            if (stripos($user_agent, $name) !== FALSE) {
                $info['name']        = $name;
                $info['is_browser']    = FALSE;
                $info['is_mobile']    = TRUE;
                $info['is_robot']    = FALSE;
                if (preg_match('|'.preg_quote($agent).'[^0-9.]*+([0-9.][0-9.a-z]*)|i', $user_agent, $match)) {
                    $info['version'] = $match['1'];
                } else {
                    $info['version']    = '';
                }

                break;
            }
        }

        if (!isset($info['name'])) {
            $browsers     = VF::cfg('library.browsers');
            foreach ($browsers as $agent => $name) {
                if (stripos($user_agent, $name) !== FALSE) {
                    $info['name']         = $name;
                    $info['is_browser'] = TRUE;
                    $info['is_robot']    = FALSE;
                    $info['is_mobile']    = FALSE;
                    if (preg_match('|'.preg_quote($agent).'[^0-9.]*+([0-9.][0-9.a-z]*)|i', $user_agent, $match)) {
                        $info['version'] = $match['1'];
                    } else {
                        $info['version']    = '';
                    }

                    break;
                }
            }
        }
        
        // identify search engines                
        $robots    = VF::cfg('library.robots');
        foreach ($robots as $robot => $name) {
            if (stripos($user_agent, $name) !== FALSE) {
                $info['name']         = $name;
                $info['is_browser']    = FALSE;
                $info['is_robot']    = TRUE;
                $info['is_mobile']    = FALSE;
                $info['version']    = '';
                break;
            }
        }
        
        if (!empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
            $HTTP_ACCEPT_LANGUAGE = VServer::get('HTTP_ACCEPT_LANGUAGE');
            if (preg_match_all('/[-a-z]{2,}/', strtolower(trim($HTTP_ACCEPT_LANGUAGE)), $matches)) {
                $info['languages'] = $matches['0'];
            }
        }
        
        if (!empty($_SERVER['HTTP_ACCEPT_CHARSET'])) {
            $HTTP_ACCEPT_CHARSET = VServer::get('HTTP_ACCEPT_CHARSET');
            if (preg_match_all('/[-a-z0-9]{2,}/', strtolower(trim($HTTP_ACCEPT_CHARSET)), $matches)) {
                $info['charsets'] = $matches['0'];
            }
        }
        
        self::$__cache = $info;
        return (isset($info[$var])) ? $info[$var] : NULL;
    }
}
?>