If you are visiting a PHP page in your server and see nothing, there's probably a fatal error in your script and PHP is likely configured to not show any errors (display_errors=off or error_reporting=0). I'd recommend you start with a simple php script to see if PHP works on your server:
<?php
phpinfo();
?>
If that scrpt doesn't work, then there's an issue with the php setup. If it does work, then there's a problem in your script.