Before jumping to the PHP Class, let’s observe our surroundings for a moment. You see tangible things in your room like books, table, chair, clothes etc. Each of these items may or may not be useful to you.
Let say you have a book. But you don’t have just one book, maybe you have few or many. But books nevertheless. If you ask school going kid what he has in his bag, he will most probably answer “books”.
In our world, there are millions and millions of books. Some are thick, some are thin. Some are big and heavy, some are light and pocket sized. But they are still books. Hope you agree to this point.