实现php文件安全下载

public function downloads($name){

  $name_tmp = explode("_",$name);

  $type = $name_tmp[0];

  $file_time = explode(".",$name_tmp[3]);

  $file_time = $file_time[0];

  $file_date = date("Y/md",$file_time);

  $file_dir = SITE_PATH."/data/uploads/$type/$file_date/"; 

  

  if (!file_exists($file_dir.$name)){

   header("Content-type: text/html; charset=utf-8");

   echo "File not found!";

   exit; 

  } else {

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

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

   Header("Accept-Ranges: bytes");

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

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

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

   fclose($file);

  }

 }