พี่ๆทั้งหลายช่วยชี้แนะด้วยคับ (มือใหม่มากๆครับ) code php download ผมติดปัญหา กดคลิกที่ไฟล์แล้วไม่ดาวน์โหลดคับ //ขอบคุณคับ

<?php
			
			
			$path	='upload';
			$Filename = $path .'/'.$_GET['filename'];
           $Filename = realpath($Filename);
           $file_extension = strtolower(substr(strrchr($Filename,"."),1));
           switch ($file_extension) {
               case "pdf": $ctype="application/pdf"; break;
               case "exe": $ctype="application/octet-stream"; break;
               case "zip": $ctype="application/zip"; break;
               case "docx": $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 "jpe": case "jpeg":
               case "jpg": $ctype="image/jpg"; break;
               default: $ctype="application/force-download";
           }
           if (!file_exists($filename)) {
               die("NO FILE HERE");
           }
           header("Pragma: public");
           header("Expires: 0");
           header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
           header("Cache-Control: private",false);
           header("Content-Type: $ctype");
         // header("Content-Disposition: attachment; filename="".basename($filename)."";");
          header("Content-Transfer-Encoding: binary");
           header("Content-Length: ".@filesize($filename));
           set_time_limit(0);
           @readfile("$Filename") or die("File not found.");

?>