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PHP does not cascade constructors
Most object oriented languages, like Java, will run the constructor of the
parent class automatically, before running an overriding constructor in the
child class. This is called cascading constructors—it's a feature that PHP
does not have.
If you create a constructor in a child class, be aware that you are completely
overriding the parent class's constructor, and that you must call it explicitly
from your new constructor if you still want the parent class to handle its
share of the object initialization.
Overriding declared member variables is achieved in exactly the same way as
methods, although you're unlikely to use this feature frequently.
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