function download($path,$file) {

$real = $path.'/'.$file;

if(!file_exists($real)) {

    return false;

}

$size = filesize($real);

$size2 = $size-1;

$range = 0;

if(isset($_SERVER['HTTP_RANGE'])) {

   header('HTTP /1.1 206 Partial Content');

   $range = str_replace('=','-',$_SERVER['HTTP_RANGE']);

   $range = explode('-',$range);

   $range = trim($range[1]);

   header('Content-Length:'.$size);

   header('Content-Range: bytes '.$range.'-'.$size2.'/'.$size);

} else {

   header('Content-Length:'.$size);

   header('Content-Range: bytes 0-'.$size2.'/'.$size);

}

header('Accenpt-Ranges: bytes');

header('application/octet-stream');

header("Cache-control: public");

header("Pragma: public");

//解决在IE中下载时中文乱码问题

$ua = $_SERVER['HTTP_USER_AGENT'];

if(preg_match('/MSIE/',$ua)) {

    $ie_filename = str_replace('+','%20',urlencode($file));

    header('Content-Dispositon:attachment;filename='.$ie_filename);

} else {

    header('Content-Dispositon:attachment;filename='.$file);

}

$fp = fopen($real,'rb+');

fseek($fp,$range);

  while(!feof($fp)) {

     set_time_limit(0);

     print(fread($fp,1024));

     flush();

     ob_flush();

  }

  fclose($fp);

}

/**

　　* 参数说明：

　　* @param string $path: 文件路径

　　* @param string $file: 文件名称

　　* @return void

*/