class - How does PHP implement that all subclass attributes have toArray() method?

Question

How to implement in PHP that all properties of subclasses have toArray() method?

After calling, it becomes an array

How to design the parent class? ?

Answer 1

interface Arrayable {
    public function toArray();
}

class parent implents Arrayable {
    public function toArray() {
        // to do
    };
}

class children extends parent{

}

Answer 2

Just write a toarray method for the parent class, that’s it,

Answer 3

Write an interface implementation, or use the parent class for inheritance