如何将类作为参数传递给PHP函数

class Person {
    private $name;
    private $age;
    
    public function __construct($name, $age) {
        $this->name = $name;
        $this->age = $age;
    }
    
    public function getName() {
        return $this->name;
    }
    
    public function getAge() {
        return $this->age;
    }
    
    public function setName($name) {
        $this->name = $name;
    }
    
    public function setAge($age) {
        $this->age = $age;
    }
}

function printPerson(Person $person) {
    echo "Name: " . $person->getName() . "<br>";
    echo "Age: " . $person->getAge() . "<br>";
}

$person = new Person("John Doe", 25);
printPerson($person);

Name: John Doe
Age: 25