PHP | ReflectionClass isInstantiable() Function

<?php

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

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

// Calling the isInstantiable() function
$instance = $class->isInstantiable();

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

<?php

// Initializing a interface named as TestFunction
interface TestFunction {
    function F1();
    function F2();
}

// Using ReflectionClass() over the
// specified interface
$class = new ReflectionClass('TestFunction');

// Calling the isInstantiable() function and
// getting the value true or false
var_dump($class->isInstantiable());
?>