You can check your apache error log for errors. There may be no errors shown on screen because it is disabled in PHP configuration (php.ini). To show errors on screen, you can set the error reporting on runtime
ini_set('display_errors', '1');
error_reporting(E_ALL);
or you can change their value in php.ini
If there are any fatal errors on your file (like parse error) the file wont get included. put a die like following after your include line to check if the script is running. If it is not then you have a problem on script.php
require('script.php');
die('test');