Ok, I have a good understanding of OOP PHP. I understand abstract classes and subclasses and inheritance, etc, etc...

I've read through books and tutorials and after all this, I can only program a site if I want abstract Animal classes and subclasses full of Dogs and Cats that can eatFood() and poopInGrass().

After some exhaustive searches, I cannot find actual real life examples of how to setup a site using OOP. I can take guesses on how to start but if I wanted to program a site where I post topics and users post comments (to make it easy, like a blog). How do I start this?

Do I have one class named site_posts() and functions within this to save new posts, display all posts and get specific posts? Then I use a page that includes a header and footer along with site_posts class and call the displayAllPosts function?

This piece seems missing from tutorials and online videos and books from the library. Does anyone know wheres the place to start?

Thanks!

You can try taking a look at some existing CMS's. Wordpress would be a good start.

Try to think of your application in terms of object interactions. You might have a Database class that handles all of your queries. It may contain a method getPost that returns a single Post object. The post object would encapsulate all of the details of a particular post (author, title, content, date created, etc).

It is a lot easier to teach OOP syntax than it is to teach OOP design, which is why it is difficult to find a tutorial that goes far beyond the basics of creating and using objects. I think it's something that you will get a feel for over time, and the best thing you can do is look at existing code (so long as the source is credible) and try to design and use your own objects.

Have a play with the Yii Framework