php利用header函数下载各种文件

<?php
/**
* 下载文件
* header函数
*
*/


dl_file($_get ['filename']);

function dl_file($file)
{
 $file = ".//images//" . $file;
 //first, see if the file exists
 
 if (! is_file ( $file ))
 {
  die ( "<b>404 file not found!</b>" );
 }
 
 // gather relevent info about file
 $len = filesize ( $file );
 $filename = basename ( $file );
 $file_extension = strtolower ( substr ( strrchr ( $filename, "." ), 1 ) );
 
 // this will set the content-type to the appropriate setting for the file
 switch ($file_extension)
 {
  case "pdf" :
   $ctype = "application/pdf";
   break;
  case "exe" :
   $ctype = "application/octet-stream";
   break;
  case "zip" :
   $ctype = "application/zip";
   break;
  case "doc" :
   $ctype = "application/msword";
   break;
  case "xls" :
   $ctype = "application/vnd.ms-excel";
   break;
  case "ppt" :
   $ctype = "application/vnd.ms-powerpoint";
   break;
  case "gif" :
   $ctype = "image/gif";
   break;
  case "png" :
   $ctype = "image/png";
   break;
  case "jpeg" :
  case "jpg" :
   $ctype = "image/jpg";
   break;
  case "mp3" :
   $ctype = "audio/mpeg";
   break;
  case "wav" :
   $ctype = "audio/x-wav";
   break;
  case "mpeg" :
  case "mpg" :
  case "mpe" :
   $ctype = "video/mpeg";
   break;
  case "mov" :
   $ctype = "video/quicktime";
   break;
  case "avi" :
   $ctype = "video/x-msvideo";
   break;
  
  // the following are for extensions that shouldn't be downloaded
  // (sensitive stuff, like php files)
  case "php" :
  case "htm" :
  case "html" :
  case "txt" :
   die ( "<b>cannot be used for " . $file_extension . " files!</b>" );
   break;
  
  default :
   $ctype = "application/force-download";
 }
 
 
 $file_temp = fopen ( $file, "r" );
 
 
 // begin writing headers
 header ( "pragma: public" );
 header ( "expires: 0" );
 header ( "cache-control: must-revalidate, post-check=0, pre-check=0" );
 header ( "cache-control: public" );
 header ( "content-description: file transfer" );
 // use the switch-generated content-type
 header ( "content-type: $ctype" );
 // force the download
 $header = "content-disposition: attachment; filename=" . $filename . ";";
 header ( $header );
 header ( "content-transfer-encoding: binary" );
 header ( "content-length: " . $len );
 
 
 //@readfile ( $file );
 echo fread ( $file_temp, filesize ( $file ) );
 fclose ( $file_temp );
 
 exit ();
}

?>