PHP Force File Download problem

[condoug]

Hi all

I am using the following code to allow a user to download an image file via link on my website but each time I download the file and open it on my computer, it says it is corrupt and cannot be open. I have proven that the image on the server is not corrupt as I can view it via the browser directly.

	switch($file_extension){
		case "gif": 
			$ctype="image/gif"; 
		break;
		case "png": 
			$ctype="image/png"; 
		break;
		case "jpeg":
		case "jpg": 
			$ctype="image/jpg"; 
		break;
		default: 
			$ctype="application/force-download";
		break;
	}

header("Pragma: public"); // required
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false); // required for certain browsers 
header("Content-Type: $ctype");
header("Content-Disposition: attachment; filename=\"".basename($filepath)."\";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filepath));
readfile($filepath);
exit();

What in the code above would cause my image file to be corrupt when I download it?

Thanks for reading.
Doug

[aj123cd]

$file = $_REQUEST['file'];
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Type: application/force-download");
header( "Content-Disposition: attachment; filename=".basename($file));
header( "Content-Description: File Transfer");@readfile($file);

[kbc1]

try th