Solution Review: Magic Method

<?php
class User {
    private $firstName; 
    private $lastName;
    public function __construct($firstName,$lastName) {
        $this -> firstName = $firstName;
        $this -> lastName = $lastName;
    }
    
    public function getFullName() {
        return $this -> firstName . ' ' . $this -> lastName;
    }
}
function test()
{
    $user1 = new User("John", "Doe"); 
    return $user1 -> getFullName();
}
echo test();
?>