Property Name from Function in OOP in PHP

The property name of an object can also be taken from a function. Let's see how it's done. Let's say we have the following class User:

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

Let's create an object of this class:

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

Suppose we have the following function:

php<?php
  function getProp()
  {
    return 'name';
  }
?>

Let's access the object's property, the name of which is returned by our function:

php<?php
  echo $user->{getProp()}; // will output 'john'
?>

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
  function getProp1()
  {
    return 'name';
  }
  function getProp2()
  {
    return 'salary';
  }
?>