Safe Extraction Operator in Chains in OOP in PHP

The safe extraction operator ?-> can be used in call chains. Let's look at an example. Suppose we have the following classes:

<?php
	class User {
		public $city = null;
	}
	
	class City {
		public function getName() {
			return 'city name';
		}
	}
?>

Suppose we want to get the user's city through the chain:

<?php
	$user = new User();
	$user->city = new City();
	
	echo $user->city->getName();
?>

In case the city is equal to null, calling such a chain will cause an error:

<?php
	$user = new User();
	$user->city = null;
	
	echo $user->city->getName(); // error
?>

To suppress the error, we can use the safe extraction operator:

<?php
	$user = new User();
	$user->city = null;
	
	echo $user->city?->getName();
?>

Suppose now the city can also be null. In this case, we can use the operator safe extraction twice:

<?php
	$user = null;
	
	echo $user?->city?->getName();
?>

Improve the following code using the safe extraction operator:

<?php
	class Employee {
		public $name;
		public $position;
		
		public function __construct($name, $position)
		{
			$this->name = $name;
			$this->position = $position;
		}
	}
	
	class Position {
		private $name;
		
		public function __construct($name)
		{
			$this->name = $name;
		}
		
		public function getName() {
			return $this->name;
		}
	}
	
	$position = new Position('developer');
	$employee = new Employee('john', $position);
	
	echo $employee->position->getName();
?>