php下载远程大文件(获取远程文件大小)的实例

废话不多说，直接上代码

<?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;