晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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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\Serializer\Encoder;

/**
 * Encodes JSON data
 *
 * @author Sander Coolen <sander@jibber.nl>
 */
class JsonEncode implements EncoderInterface
{
    private $options ;
    private $lastError = JSON_ERROR_NONE;

    public function __construct($bitmask = 0)
    {
        $this->options = $bitmask;
    }

    /**
     * Returns the last encoding error (if any)
     *
     * @return integer
     *
     * @see http://php.net/manual/en/function.json-last-error.php json_last_error
     */
    public function getLastError()
    {
        return $this->lastError;
    }

    /**
     * Encodes PHP data to a JSON string
     *
     * {@inheritdoc}
     */
    public function encode($data, $format, array $context = array())
    {
        $context = $this->resolveContext($context);

        $encodedJson = json_encode($data, $context['json_encode_options']);
        $this->lastError = json_last_error();

        return $encodedJson;
    }

    /**
     * {@inheritdoc}
     */
    public function supportsEncoding($format)
    {
        return JsonEncoder::FORMAT === $format;
    }

    /**
     * Merge default json encode options with context.
     *
     * @param array $context
     * @return array
     */
    private function resolveContext(array $context = array())
    {
        return array_merge(array('json_encode_options' => $this->options), $context);
    }
}