PHP da OOP da massiv elementidan xususiyat nomi

Keling, endi massiv elementidan obyekt xususiyatiga qanday murojaat qilishni ko'rib chiqaylik. Faraz qilaylik, bizda quyidagi User klassi mavjud:

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

Ushbu klassning ob'ektini yaratamiz:

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

Faraz qilaylik, xususiyatlar massivi berilgan:

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

Endi massivning nolchi elementida saqlanayotgan xususiyat qiymatini chiqarishga harakat qilaylik:

php<?php
  echo $user->$props[0]; // bunday ishlamaydi
?>

Bunday murakkab xususiyat nomini ishlatish uchun, uni jingalak qavs ichiga olish kerak, mana shunday:

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

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'];
?>