Property Name from Array in OOP in PHP

Let's now look at how to access an object's property by name from an array element. Suppose we have the following class User:

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

Suppose an array of properties is given:

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

Now let's try to output the value of the property that is stored in the zero element of the array:

<?php
	echo $user->$props[0]; // this will not work
?>

For such a complex property name to work, it must be enclosed in curly braces, like this:

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

The following class is given:

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

An array is given:

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

Create an object of the Employee class, and then access its properties through the array elements.