Question

I have something like :

interface IProduct { }
class Product implements IProduct { }
class SpecificProduct extends Product { }

I need to have a interface, that extends IProduct, for my SpecificProduct.
Can I just do something like :

interface ISpecificProduct { }
class SpecificProduct extends Product implements ISpecificProduct { }

or will it overwrite the IProduct interface ?

Answer 1

This works in PHP, this way, just go through:

class SpecificProduct as it extends Product it implements IProduct already. As it implements ISpecificProduct as well, it has both interfaces.

SpecificProduct now has two interfaces then:

1. IProduct
2. ISpecificProduct