calling parent constructors

[eluser]theprodigy[/eluser]
I don't believe it is "necessary", but it is good practice.
By default, if PHP does not find a constructor, it will look to the parent for one.

The only time it is absolutely necessary for the php class to have a constructor is if you want something to happen when your class is instantiated, that differs from just calling the parent constructor. Other then that, it's not necessary, but like I said, it's just good practice.