Forcer le telechargement : image non valide

Hellow,

Un problème léger mais prise de tête!!

Voici la fonction...

function telecharge($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 "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 "jpe": case "jpeg":
               case "jpg": $ctype="image/jpeg"; break;
               default: $ctype="application/force-download";
           }

           if (!file_exists($filename)) {
               die("NO FILE HERE");
           }
			
           header("Pragma: public");
           header("Expires: Mon, 03 Mar 2006 05:00:00 GMT"); // some day in the past
		   header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
           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.");

}

$Filename reçoit ../photos/ecran/nomdelaphoto.jpg Chmod 0777

Lorsque l'image est telecharger elle est non valide. On peut l'ouvrir avec photoshop mais elle est endommagée.


Je commence à tourner un peu en rond...

Quelqu'un a-t-il la solution??

Merci d'avance

Spi----