title: setting page access permissions in drupal
body: <p>I'm new to drupal. Its a very dumb question I guess. 
  I have enabled PHP filter module so that I can create a new page with my own PHP code in it. This particular page I want to be accessible to only authenticated users, not visible to anonymous users. How can I achieve this? Can I set permissions for individual pages in drupal? Or is it possible to identify that an anonymous user is trying to access the current page through PHP code?</p>