PHP-da OOP-de massiw elementinden at boyunça aýratynlyga ýüzleniş

Indi massiw elementinden at boyunça aýratynlyga nädip ýüzlenmelidigine seredeliň. Aşakdaky User klasymyz bolsun:

php<?php
  class User
  {
    public $name;
    public $surn;
    
    public function __construct($name, $surn)
    {
      $this->name = $name;
      $this->surn = $surn;
    }
  }
?>

Bu klassyň bir obyektini döredeliň:

php<?php
  $user = new User('john', 'smit');
?>

Aýratynlyklaryň massiw berlen diýeliň:

php<?php
  $props = ['name', 'surn'];
?>

Indi massiwdaky nol elementde saklanylan aýratynlygyň bahasyny çap etmek synanyşalyň:

php<?php
  echo $user->$props[0]; // şeýle işlemez
?>

Beýle bir çylşyrymly aýratynlyk atynyň işlemegi üçin ony burç ýaýlaryna almaly, şeýle:

php<?php
  echo $user->{$props[0]}; // 'john' çykarar
?>

php<?php
  class Employee
  {
    public $name;
    public $salary;
    public $position;
    
    public function __construct($name, $salary, $position)
    {
      $this->name = $name;
      $this->salary = $salary;
      $this->position = $position;
    }
  }
?>

php<?php
  $arr = ['name', 'salary', 'position'];
?>