url_short;    }    return $arr;}function downfile($fileurl) {    ob_start();    $filename = $fileurl;    $date = date("Ymd-H:i:m");    header("Content-type:  application/octet-stream ");    header("Accept-Ranges:  bytes ");    header("Content-Disposition:  attachment;  filename= {
   $date}.txt");    $size = readfile($filename);    header("Accept-Length: " . $size);}set_time_limit(0);if (!empty($_POST['submit'])) {    if ($_FILES['file']['error'] == 0) {        if ($_FILES['file']['type'] == 'text/plain') {            $baseurl = dirname(__FILE__)."/upload/";            $url = $baseurl . getMulu();            if (!is_dir($url)) {                mkdir($url, 0777, true);            }            $file_dizhi = $url . mtrand();            $rs = move_uploaded_file($_FILES["file"]["tmp_name"], $file_dizhi.'.txt');            if ($rs) {                //读取文件                $file = fopen($file_dizhi.'.txt', "r");                $xieru_txt = '';                $num = 0;                $temp_url = '';                while (!feof($file)) {                                       $temp_url .= '&url_long='.urlencode(trim(fgets($file)));                    $num++;                    if($num%20 == 0){                        $rs =  shortenSinaUrl($temp_url);                        $xieru_txt .= implode("\r\n", $rs);                        $xieru_txt .= "\r\n";                        $temp_url = '';                     }                                    }                fclose($file);                file_put_contents($file_dizhi.'_xieru.txt', $xieru_txt);                downfile($file_dizhi.'_xieru.txt');                exit;            }        } else {            echo '请上传txt文件';        }    } else {        echo '上传失败';    }}?>