PHP | ReflectionParameter isCallable() Function

<?php

// Initializing a user-defined class Company1
class Company1
{
    public function GFG( callable $Parameter){}
}
 
// Initializing a subclass Company2
class Company2 extends Company1
{
}
 
// Using the ReflectionParameter over the above class
$A = new ReflectionParameter(['Company2', 'GFG'], 0); 
 
// Calling the isCallable() function
$B = $A->isCallable();
 
// Getting TRUE if the specified parameter
// is callable, FALSE otherwise.
var_dump($B);
?>

<?php

// Initializing some user-defined classes
class Department1
{
    protected function HR( callable $Parameter1){}
}
class Department2
{
    final function Coding( $Parameter2, $Parameter3){}
}
class Department3
{
    function Marketing( sting $Parameter4, 
       string $Parameter5, string $Parameter6){}
}

// Using the ReflectionParameter over the above classes
$A = new ReflectionParameter(['Department1', 'HR'], 0);
$B = new ReflectionParameter(['Department2', 'Coding'], 1);
$C = new ReflectionParameter(['Department3', 'Marketing'], 2);

// Calling the isCallable() function and 
// getting TRUE if the specified parameter 
// is callable, FALSE otherwise.
var_dump($A->isCallable());
var_dump($B->isCallable());
var_dump($C->isCallable());
?>