split.php

<?php
        $valueCards = \__::map($purchaseRes->getPrepayItems(), function($item) {
            \__::chain()
            ->range($item->getTotalQuantity())
            ->map(function () use ($item) {
                return ValueCard::create(array(
                    $item->getProductIdentifier() => 1,
                ));
            })
            ->values();
        });
        $valueCards = \__::flatten($valueCards);