PHP uses header function to download various files

The example in this article shares the php header function download file implementation code for your reference. The specific content is as follows

http://www.php.net/manual/en/function.readfile.php

404 File not found!" );
 }
  
 // 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 ( "Cannot be used for " . $file_extension . " files!" );
   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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