Fortare download-ului a oricarui tip de fisier in PHP

<?php
 
function dl_file($file){
 
   //First, see if the file exists
   if (!is_file($file)) { die("<b>404 Fisierul nu  fost gasit!</b>"); }
 
   //Scoatem informatii despre fisier
   $len = filesize($file);
   $filename = basename($file);
   $file_extension = strtolower(substr(strrchr($filename,"."),1));
 
   //Setam Content-Type-urile pentru  fisierul in cauza
   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;
 
     //urmatoarele tipuri de fisiere nu ar trebui sa poate fi downloadate (chestii sensibile ca fisierele php, etc)
     case "php":
     case "htm":
     case "html":
     case "txt": die("<b>Nu poate fi folosita pentru fisiere  cu estensia ". $file_extension ." !</b>"); break;
 
     default: $ctype="application/force-download";
   }
 
   //Scriem headerele
   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");
 
   //Folosim Content-Type-ul din switch
   header("Content-Type: $ctype");
 
   //Fortam downloadul
   $header="Content-Disposition: attachment; filename=".$filename.";";
   header($header );
   header("Content-Transfer-Encoding: binary");
   header("Content-Length: ".$len);
   @readfile($file);
   exit;
}
 
?>