Simple question

Hello I have one line of php code that would switch out information on a webpage. <?php @ require_once ("folder/$Product.php"); ?> This would pull in a div with an image and paragraph (the file would be located within the same folder or subfolder). This simple code worked fine until we upgraded to PHP5. Is there a slight tweak that needs to be done to the code to get it to work again? Any help would be greatly appreciated.