How to implement the filling of static properties in inherited classes from the parent?

Question

PHP

Something I got confused with static. More precisely, with how it can be used to make a singleton.

<?php

/** Описание обьекта B */
class B extends Base {}

/** Описание обьекта А */
class A extends Base {}


class Base {

  public static $comment;
  
  public static $name;
  
  public function __construct(){
    //Нет смысла выполнять этот код для каждого экземпляра класса
    //так как комментарий и имя статичны для класса
    
    //if(is_null(static::$name)){
      $reflect = new ReflectionClass(static::class);
      static::$comment = $reflect->getDocComment();
      static::$name = $reflect->getShortName();
      echo "<br>Получение Reflect данных для класса ".static::$name;
    //}
  }
}


echo "<pre>";

for($i=0;$i<3;$i++){
  $list = [];
  
  foreach(['A','B'] as $className){
    $class = new $className();
    $list[$class::$name] = $class::$comment;
  }
  
  echo "<br>";
  print_r($list);
  echo "<hr>";
}

PHP Fiddle
As you can see from the code, it makes no sense to initialize static properties for each object, they must be initialized once for each class

Answer 1

class Foo{

    public static function changeTest()
    {
  static::$test = '321';
    }
}

class Bar extends Foo
{
  public static $test = 123;
}

var_dump(Bar::$test);
Bar::changeTest();
var_dump(Bar::$test);

But this is a very bad approach. The parent class should not know anything about the child at all.