How to download various files in php based on header function

This article mainly introduces in detail the code of PHP using the header function to download various files. Interested friends can refer to it

The specific content is as follows

<?php
/**
* 下载文件
* header函数
*
*/


dl_file($_GET [&#39;filename&#39;]);

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&#39;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 ();
}

?>

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