Zistenie veľkosti súbora uloženého na inom serveri

function get_filesize($url)
{
//        $url = str_replace(' ', '%20', $url);
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 5);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_HEADER, 1);
        curl_setopt($curl, CURLOPT_NOBODY, 1);
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 6.0; sk; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14");
        curl_setopt ($curl, CURLOPT_HTTPHEADER, Array(
                "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5",
                "Accept-Language: sk,cs;q=0.8,en;q=0.5,en-us;q=0.3",
                "Accept-Charset: ISO-8859-2,utf-8;q=0.7,*;q=0.7"
        ));

        $filesize = '';
        if (curl_exec($curl) !== false && curl_getinfo($curl, CURLINFO_HTTP_CODE) == '200') {
                $filesize = curl_getinfo($curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
        }
        curl_close($curl);
        return $filesize;
}

echo get_filesize("http://.../obrazok.png");