PHP | ReflectionClass isSubclassOf() Function

<?php

// Initialising a user-defined superclass Company
class Company {
    public function GeeksforGeeks() {}
}

// Creating a subclass Departments 
class Departments extends Company {
    public function HR_Department() {}
}

// Using ReflectionClass() 
$subclass = new ReflectionClass('Departments');

// Calling the isSubclassOf() function
$Result = $subclass->isSubclassOf('Company');

// Getting the value true or false
var_dump($Result);
?>

<?php

// Initialising a user-defined class Departments
class Departments {
    public function CSE() {}
}

// Using ReflectionClass() over the
// user-defined class Departments
$subclass = new ReflectionClass('Departments');

// Calling the isSubclassOf() function
$Result = $subclass->isSubclassOf('Departments');

// Getting the value true or false
var_dump($Result);
?>