Json.php

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<?php
namespace Magento\Framework\Serialize\Serializer;

use Magento\Framework\Serialize\SerializerInterface;

class Json implements SerializerInterface
{
    public function serialize($data)
    {
        $result = json_encode($data);
        if (false === $result) {
            throw new \InvalidArgumentException('Unable to serialize value.');
        }
        return $result;
    }

    public function unserialize($string)
    {
        $result = json_decode($string, true);
        if (json_last_error() !== JSON_ERROR_NONE) {
            throw new \InvalidArgumentException('Unable to unserialize value.');
        }
        return $result;
    }
}