Php, composite pattern, is it bad when child knows about parent?

Question

given this code:

class Parent
{
    public function getAdata()
    {
        return array(1,2,3,4);
    }

    public function getChild()
    {
        return ne         


        

Answer 1

There is no parent-child relationship here at all. You merely instantiate one class and pass it an instance of another class. There's no problem with that at all, and it doesn't mean those classes are in any sort of relationship.

What is bad about the example is that you hardcode Child inside of Parent. That makes Child a hardcoded dependency which cannot be substituted or externally controlled, and hence may cause problems in the future with testing or refactoring code. You should look into dependency injection instead.