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;

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