php如何下载远程大文件和获取远程文件大小

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<?php   // 暂不支持断点续传   // $url = 'http://www.mytest.com/debian.iso'; 不知道为何获取本地文件大小为0   $url = 'http://192.168.8.93/download/vm-672/18/0.vmdk';   $file = basename($url);   $header = get_headers($url, 1);   $size = $header['Content-Length'];     $fp = fopen($url, 'rb');   if ($fp === false) exit('文件不存在或打开失败');     header('Content-Description: File Transfer');   header('Content-Type: application/octet-stream');   header('Content-Disposition: attachment; filename="'.$file.'"');   header('Content-Transfer-Encoding: binary');   header('Expires: 0');   header('Cache-Control: must-revalidate, post-check=0, pre-check=0');   header('Pragma: public');   header('Content-Length: ' . $size);     ob_clean();   ob_end_flush();   set_time_limit(0);       $chunkSize = 1024 * 1024;   while (!feof($fp)) {     $buffer = fread($fp, $chunkSize);     echo $buffer;     ob_flush();     flush();   }   fclose($fp);   exit;

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