I am trying to uniq to a string so the following code has:

Code:
	$n = "$imagename.$ext";
It creates a range and adds the file type such as: 19572185.png

Can anyone advise how I add uniqid() to a string.

Code:
case 'image/jpeg': $ext = 'jpg'; break;
case 'image/gif': $ext = 'gif'; break;
case 'image/png': $ext = 'png'; break;
case 'image/tiff': $ext = 'tif'; break;
default: 		$ext = ''; break;
}
if ($ext)
{
	$n = "uniqid().$ext";
	move_uploaded_file($_FILES['filename']['tmp_name'], $n);
	echo "Upload image '$name' as '$n':<br />";
}
else echo "'$name' is not accepted image file";
}
else echo "No image has been uploaded";