Is it possible to have an interface that has private / protected methods?

Question

Is it possible in PHP 5 to have an interface that has private / protected methods?

Right now I have:

interface iService
{
    private method1();
}
         


        

Answer 1

interfaces are type declarations. a type is set of values, plus a set of operations that can be carried upon them from outside. a private method doesn't fit into this picture.

interface T {
  public /*int*/ function f(array $a);
}
interface U {
  public /*T*/ function g(T $t);
}

class C implements U {
    public function g(T $t) {
        ...
        $x = $t->f();
        ...
    }
}

interfaces are useful because they state, well, objects' interfaces. how the objects communicate with their environment.

now let's say T::f could be declared private. how would that be useful to other objects? it would not callable from outside, it would not be part of its interface.