If your directory paths have changed, you have likely broken it.
PHP searches on two initial conditions: the current working directory of the EXECUTING script, and the include_path if not found in the current working directory.
If you've changed the directories the files are in and they do have reliance on each other, than you must ensure that they are loaded from the current working directory of the executing script.
Your options are either to:
- Provide an absolute path
- Add a base to the include_path
- Create relative from this file by making use of __DIR__ or dirname(__FILE__) on older versions of PHP.
Of course, that assumes an issue with loading an included script. Since you've posted no errors and no description of a problem, I have simply guessed that.