Couldn't I write: isset(static::$structure) ?
You could, but that's only runtime. People generally prefer compile-time control which is derived from definition rather than per-instance runtime control (implementing interface vs. checking each time if class has certain methods).
So this will be my very last (and so much naïve) question: do you know how people cope with it in other OO languages?
AFAIK there are not many languages which allow you to do non-static static calls... I see no way of doing it in Java or C++ - please correct me if I'm wrong.
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