Operator Instanceof

<?php
// Definisi kelas
class Person {
    public $name;
}

class Student extends Person {
    public $studentId;
}

// Pembuatan objek
$person = new Person();
$student = new Student();

// Penggunaan operator instanceof
$result1 = $person instanceof Person;
$result2 = $student instanceof Person;
$result3 = $student instanceof Student;

echo $result1; // Output: 1 (true)
echo $result2; // Output: 1 (true)
echo $result3; // Output: 1 (true)
?>