Convert nested object into nested array

Helper.php

<?php
use ReflectionClass;

class Helper
{
    public static function toRupiah($number, bool $withPrefix = true)
    {
        return ($withPrefix ? "Rp " : "") . number_format($number, 0, ",", ".");
    }

    public static function toArrayDeep($obj)
    {
        if (is_object($obj)) $obj = (array) self::dismount($obj);
        if (is_array($obj)) {
            $new = array();
            foreach ($obj as $key => $val) {
                $new[$key] = self::toArrayDeep($val);
            }
        } else $new = $obj;

        return $new;
    }

    private static function dismount($object)
    {
        $reflectionClass = new ReflectionClass(get_class($object));
        $array = array();
        foreach ($reflectionClass->getProperties() as $property) {
            $property->setAccessible(true);
            $array[$property->getName()] = $property->getValue($object);
            $property->setAccessible(false);
        }
        return $array;
    }
}

// use :
// $obj = /** your nested object */;
// $yourNestedArray = Helper::toArrayDeep($obj);