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Filename : DefaultMarshaller.php
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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Cache\Marshaller;

use Symfony\Component\Cache\Exception\CacheException;

/**
 * Serializes/unserializes values using igbinary_serialize() if available, serialize() otherwise.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
class DefaultMarshaller implements MarshallerInterface
{
    private $useIgbinarySerialize = true;

    public function __construct(bool $useIgbinarySerialize = null)
    {
        if (null === $useIgbinarySerialize) {
            $useIgbinarySerialize = \extension_loaded('igbinary') && \PHP_VERSION_ID !== 70400;
        } elseif ($useIgbinarySerialize && (!\extension_loaded('igbinary') || \PHP_VERSION_ID === 70400)) {
            throw new CacheException('The "igbinary" PHP extension is not '.(\PHP_VERSION_ID === 70400 ? 'compatible with PHP 7.4.0.' : 'loaded.'));
        }
        $this->useIgbinarySerialize = $useIgbinarySerialize;
    }

    /**
     * {@inheritdoc}
     */
    public function marshall(array $values, ?array &$failed): array
    {
        $serialized = $failed = [];

        foreach ($values as $id => $value) {
            try {
                if ($this->useIgbinarySerialize) {
                    $serialized[$id] = igbinary_serialize($value);
                } else {
                    $serialized[$id] = serialize($value);
                }
            } catch (\Exception $e) {
                $failed[] = $id;
            }
        }

        return $serialized;
    }

    /**
     * {@inheritdoc}
     */
    public function unmarshall(string $value)
    {
        if ('b:0;' === $value) {
            return false;
        }
        if ('N;' === $value) {
            return null;
        }
        static $igbinaryNull;
        if ($value === ($igbinaryNull ?? $igbinaryNull = \extension_loaded('igbinary') && \PHP_VERSION_ID !== 70400 ? igbinary_serialize(null) : false)) {
            return null;
        }
        $unserializeCallbackHandler = ini_set('unserialize_callback_func', __CLASS__.'::handleUnserializeCallback');
        try {
            if (':' === ($value[1] ?? ':')) {
                if (false !== $value = unserialize($value)) {
                    return $value;
                }
            } elseif (false === $igbinaryNull) {
                throw new \RuntimeException('Failed to unserialize values, did you forget to install the "igbinary" extension?');
            } elseif (null !== $value = igbinary_unserialize($value)) {
                return $value;
            }

            throw new \DomainException(error_get_last() ? error_get_last()['message'] : 'Failed to unserialize values.');
        } catch (\Error $e) {
            throw new \ErrorException($e->getMessage(), $e->getCode(), E_ERROR, $e->getFile(), $e->getLine());
        } finally {
            ini_set('unserialize_callback_func', $unserializeCallbackHandler);
        }
    }

    /**
     * @internal
     */
    public static function handleUnserializeCallback($class)
    {
        throw new \DomainException('Class not found: '.$class);
    }
}