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HomeBackend DevelopmentPHP TutorialPHP实现的文件直接输出下载_PHP

  你一定会笑我“下载文件”如此简单都值得说?当然并不是想你想象的那么简单。例如你希望客户要填完一份表格,才可以下载某一文件,你第一个想法一定是用 “Redirect”的方法,先检查表格是否已经填写完毕和完整,然后就将网址指到该文件,这样客户才能下载,例如笔者编写的以下代码:

  <?

  // 检查 FORM 是否全部填写完毕...

  if ($form_completed) {

  Header("Location: http://www.webjx.com/download/info_check.exe");

  exit;

  }

  ?>

  或者是以下的情况:

  “ <a href="http://www.yourwebl.com/users/download.php?id=124524">开始下载文件</a> ”

  这里利用了ID方式接收要下载文件的编号,然后用“Redirect”的方式连接到实际的网址。   

  如果你想做一个关于“网上购物”的电子商务网站,考虑安全问题,你不想用户直接复制网址下载该文件,笔者建议你使用PHP直接读取该实际文件然后下载的方法去做。程序如下:

  <?

  $file_name = "info_check.exe";

  $file_dir = "/public/www/download/";

  if (!file_exists($file_dir . $file_name)) { //检查文件是否存在

  echo "文件找不到";

  exit;

  } else {

  $file = fopen($file_dir . $file_name,"r"); // 打开文件

  // 输入文件标签

  Header("Content-type: application/octet-stream");

  Header("Accept-Ranges: bytes");

  Header("Accept-Length: ".filesize($file_dir . $file_name));

  Header("Content-Disposition: attachment; filename=" . $file_name);

  // 输出文件内容

  echo fread($file,filesize($file_dir . $file_name));

  fclose($file);

  exit;}

  ?>

  而如果文件路径是“http”或者“ftp” 网址的话,则源代码会有少许改变,程序如下:

  <?

  $file_name = "info_check.exe";

  $file_dir = "http://www.webjx.com/";

  $file = @ fopen($file_dir . $file_name,"r");

  if (!$file) {

  echo "文件找不到";

  } else {

  Header("Content-type: application/octet-stream");

  Header("Content-Disposition: attachment; filename=" . $file_name);

  while (!feof ($file)) {

  echo fread($file,50000);

  }

  fclose ($file);

  }

  ?>

  这样就可以用PHP直接输出文件了。

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