PHP实现文件安全下载的实例

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 = “www.easycn.net/”;

  $file = @ fopen($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