How to pass a data member value to private object inside parent object?

You have to pass the data to $_obj some way or another. What is the preferred way depends on the relation between both objects. If eg. AA is an extension of class BB you can just share the variable data by extending class BB ( class AA extends BB { } ).

But if BB is, another example given, an interface of some sort (not the programatical interface keyword) you should pass the data to BB. Than do something like this.

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