PHP da OOP da Meros Olganda Privat Usullar

Privat usullar meros qilib olinmaydi. Bunga inkapsulyatsiyani buzmaslik uchun qasdan qilingan. Keling, bir misolni ko'rib chiqaylik. Faraz qilaylik, bizda quyidagi ota-ona klassi va uning privat usuli bor:

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

Faraz qilaylik, ota-ona klassidan quyidagi klass meros oladi:

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

Faraz qilaylik, avlod ota-onaning privat usulidan foydalanishni xohlaydi. PHP bunga ruxsat bermaydi va xatolik qaytaradi:

php<?php
  class Student extends User {
    private $surn;
    
    public function setSurn($surn) {
      $this->surn = $surn;
    }
    public function getSurn() {
      return $this->capeFirst($this->surn); // xatolik bo'ladi
    }
  }
?>