FormData.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Serialize\Serializer;

class FormData
{
    private $serializer;

    public function __construct(Json $serializer)
    {
        $this->serializer = $serializer;
    }

    public function unserialize(string $serializedData): array
    {
        $encodedFields = $this->serializer->unserialize($serializedData);

        if (!is_array($encodedFields)) {
            throw new \InvalidArgumentException('Unable to unserialize value.');
        }

        $formData = [];
        foreach ($encodedFields as $item) {
            $decodedFieldData = [];
            parse_str($item, $decodedFieldData);
            $formData = array_replace_recursive($formData, $decodedFieldData);
        }

        return $formData;
    }
}