Overtrue\Validation\Validator::parseData PHP Method

    protected function parseData(array $data)
    {
        $this->files = [];
        foreach ($data as $key => $value) {
            // If this value is an instance of the HttpFoundation File class we will
            // remove it from the data array and add it to the files array, which
            // we use to conveniently separate out these files from other data.
            if (in_array($value, $_FILES, true)) {
                $this->files[$key] = $value;
                unset($data[$key]);
            }
        }
        return $data;
    }