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Edit File: CachedCurrencies.php

<?php

namespace Money\Currencies;

use Cache\Taggable\TaggableItemInterface;
use Money\Currencies;
use Money\Currency;
use Psr\Cache\CacheItemPoolInterface;

/**
 * Cache the result of currency checking.
 *
 * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
 */
final class CachedCurrencies implements Currencies
{
    /**
     * @var Currencies
     */
    private $currencies;

/**
     * @var CacheItemPoolInterface
     */
    private $pool;

public function __construct(Currencies $currencies, CacheItemPoolInterface $pool)
    {
        $this->currencies = $currencies;
        $this->pool = $pool;
    }

/**
     * {@inheritdoc}
     */
    public function contains(Currency $currency)
    {
        $item = $this->pool->getItem('currency|availability|'.$currency->getCode());

if (false === $item->isHit()) {
            $item->set($this->currencies->contains($currency));

if ($item instanceof TaggableItemInterface) {
                $item->addTag('currency.availability');
            }

$this->pool->save($item);
        }

return $item->get();
    }

/**
     * {@inheritdoc}
     */
    public function subunitFor(Currency $currency)
    {
        $item = $this->pool->getItem('currency|subunit|'.$currency->getCode());

if (false === $item->isHit()) {
            $item->set($this->currencies->subunitFor($currency));

if ($item instanceof TaggableItemInterface) {
                $item->addTag('currency.subunit');
            }

$this->pool->save($item);
        }

return $item->get();
    }

/**
     * {@inheritdoc}
     */
    #[\ReturnTypeWillChange]
    public function getIterator()
    {
        return new \CallbackFilterIterator(
            $this->currencies->getIterator(),
            function (Currency $currency) {
                $item = $this->pool->getItem('currency|availability|'.$currency->getCode());
                $item->set(true);

if ($item instanceof TaggableItemInterface) {
                    $item->addTag('currency.availability');
                }

$this->pool->save($item);

return true;
            }
        );
    }
}

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