I have a parent class called Page it resides in a file called Page.class.php

then I derive a class from it called Comics

when I reside Comics in the file Comics.class.php and include the parent class file Page.class.php
php complains and can't see the class Page.

i had to store both classes in the same file Page.class.php and then it worked.

I don't want to keep doing that because my classes are long and it's not readable to have them in one file.

any ideas ?