So: no arrays...
One of my hobbies is genealogy.
My familytree consists of around 12.000 people
I like to host my familytree myself, but I have tried every single application and there's not one that suits me.
So I decided to start building one myself.
On localhost I have been working for about two weeks on an array-based (without a database) application and I got very far, but it came to an abrupt end when the webserver ran out of memory on the most important functionality.
So: that was that and on to a MySQLi-based fully self-build familytree!