call A::operation from within class B, you would use
parent:operation();
I should call parent:operation() inside the class B inside the funcion operation
I suppose is work like this

class A {
    public $attribute = 'default value';
    function operation() {
        echo 'Something<br />';
        echo 'The value of $attribute is '. $this->attribute.'<br />';
    }
}
class B extends A {
    public $attribute = 'different value';
    function operation(){
       echo 'Something else<br />';
       echo 'The value of $attribute is ' . $this->attribute.'<br />';
       parent::operation();
    }    

}
$a = new A();
$a->attribute;
$a->operation();
$b = new B();
$b->attribute;
$b->operation();

    parent::operation(); is it the correct place inside the class B extends A ?

    bertrc is it the correct place inside the class B extends A ?

    That totally depends on what you are trying to do and why you want to call that parent method.

    FWIW, these lines don't actually do anything:

    $a->attribute;
// . . .
$b->attribute;

    They reference those object properties, but they neither output them nor set any value, they just "mention" them in your source code.

    Suggestion: try doing something "meaningful" in your learning code, rather than having abstract things like $attribute or $operation. Think about some real-world case where you might want to extend one class with another (or look for tutorials that do that). Then I think these OOP concepts might make more sense? 🤷

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