php实现文件下载！

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);
  }
 }

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