Bocharsky Victor db7dab5b0d Replace array storage with SplObjectStorage
If you already use SPL interfaces in your example, maybe better to use `SplObjectStorage` too instead of `array` to store observers with `attach` and `detach` convenient methods?
What do you think?
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Behavioral

In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication.