I have another one for you all. Maybe this one will get some more responses...

Can you overuse require_once()? I want to be sure every part of my app can stand on it's own.

Example:

In my header file I also include my database connection and other configurations. The db connection and other configurations are obviously used by other parts of the app. So if I was doing some testing or something and didn't include my header file, I would still want that part of the app to work; require_once() would save the day.

So is there a downside or any cautions to using it too much? I couldn't find any myself but I was just curious.

Thanks

Nope, there is nothing like that.
Any call to require() can be replaced with require_once(), with this mega advantage that you don't risks to double include a file.

It's especially useful when you include a class or a file with only functions, as you would have an error if you included 2 times a file containing the same function / class name.

That's exactly what I was talking about, requiring classes and function libraries. Thanks!