Private Properties in Inheritance in OOP in PHP

Private properties are not inherited. But a descendant can manipulate them through the parent's public methods. Let's see it in practice. Suppose we have the following parent class with a private property and its getter and setter:

php<?php
  class User {
    private $name;
    
    public function setName($name) {
      $this->name = $name;
    }
    public function getName() {
      return $this->name;
    }
  }
?>

Let the following descendant inherit from this parent:

php<?php
  class Student extends User {
    
  }
?>

Let's create an object of the descendant:

php<?php
  $student = new Student;
?>

Let's use the parent's method to set its private property:

php<?php
  $student->setName('john');
?>

Let's use the parent's method to read its private property:

php<?php
  $name = $student->getName();
  echo $name;
?>

php<?php
  class User {
    private $name;
    private $surn;
    
    public function setName($name) {
      $this->name = $name;
    }
    public function getName() {
      return $this->name;
    }
    
    public function setSurn($surn) {
      $this->surn = $surn;
    }
    public function getSurn() {
      return $this->surn;
    }
  }
?>

php<?php
  public function getFull() {
    return $this->name . ' ' . $this->surn;
  }
?>