protected   function curl_exec_utf8($ch) {
        $data = curl_exec($ch);
         if (!is_string($data)) return $data;

        unset($charset);
        $content_type = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);

        /* 1: HTTP Content-Type: header */
        preg_match( '@([\w/+]+)(;\s*charset=(\S+))?@i', $content_type, $matches );
        if ( isset( $matches[3] ) )
            $charset = $matches[3];

        /* 2: <meta> element in the page */
        if (!isset($charset)) {
            preg_match( '@<meta\s+http-equiv="Content-Type"\s+content="([\w/]+)(;\s*charset=([^\s"]+))?@i', $data, $matches );
            if ( isset( $matches[3] ) )
                $charset = $matches[3];
        }

        /* 3: <xml> element in the page */
        if (!isset($charset)) {
            preg_match( '@<\?xml.+encoding="([^\s"]+)@si', $data, $matches );
            if ( isset( $matches[1] ) )
                $charset = $matches[1];
        }

        /* 4: PHP's heuristic detection */
        if (!isset($charset)) {
            $encoding = mb_detect_encoding($data);
            if ($encoding)
                $charset = $encoding;
        }

        /* 5: Default for HTML */
        if (!isset($charset)) {
            if (strstr($content_type, "text/html") === 0)
                $charset = "ISO 8859-1";
        }

        /* Convert it if it is anything but UTF-8 */
        /* You can change "UTF-8"  to "UTF-8//IGNORE" to
ignore conversion errors and still output something reasonable */
        if (isset($charset) && strtoupper($charset) != "UTF-8")
            $data = iconv($charset, 'CP1251', $data);

        return $data;
    }