How to get caller class name PHP

Question

PHP

How to get the name of the class that called the action in the parent class?
Example:

class ParentClass {
    function action() {
        echo $className;
    }
}

class ChildClass extends ParentClass {}

$parentClass = new ParentClass();
$parentClass->action();     // ParentClass

$childClass = new ChildClass();
$childClass->action();      // ChildClass

Answer 1

I'm sorry, get_called_class()

Answer 2

class ParentClass {
    function action() {
        echo get_class($this);
    }
}

Answer 3

That is, roughly speaking. The problem is that the start can take a value either from the cross table or from the clutch table?
The description of the question is not too clear, I would make a schematic in workbeanch or something like that. There would be more answers.