Method Chaining in OOP in PHP

It is possible to make methods callable one after another in a chain. For this, each such method must return $this. Let's try it. Let's add the corresponding code to the setters of our class:

<?php
	class User {
		private $name;
		private $surn;
	
		public function setName($name) {
			$this->name = $name;
			return $this;
		}
		
		public function setSurn($surn) {
			$this->surn = $surn;
			return $this;
		}
		
		public function getName() {
			return $this->name;
		}
		
		public function getSurn() {
			return $this->surn;
		}
	}
?>

Now our setters can be called one after another, in a chain. Let's test it. Let's create an object of our class:

<?php
	$user = new User();
?>

Let's call our setters in a chain:

<?php
	$user->setName('john')->setSurn('smit');
?>

Let's check that the property values have changed:

<?php
	echo $user->getName();
	echo $user->getSurn();
?>

Make it so that the setters of the Employee class can be called in a chain.