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。 .
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<?php

// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-FileCopyrightText: 2015 Paul L. McNeely
// SPDX-License-Identifier: BSD-3-Clause

declare(strict_types=1);

namespace SimplePie\Cache;

use Memcached as NativeMemcached;

/**
 * Caches data to memcached
 *
 * Registered for URLs with the "memcached" protocol
 *
 * For example, `memcached://localhost:11211/?timeout=3600&prefix=sp_` will
 * connect to memcached on `localhost` on port 11211. All tables will be
 * prefixed with `sp_` and data will expire after 3600 seconds
 *
 * @uses       Memcached
 * @deprecated since SimplePie 1.8.0, use implementation of "Psr\SimpleCache\CacheInterface" instead
 */
class Memcached implements Base
{
    /**
     * NativeMemcached instance
     * @var NativeMemcached
     */
    protected $cache;

    /**
     * Options
     * @var array<string, mixed>
     */
    protected $options;

    /**
     * Cache name
     * @var string
     */
    protected $name;

    /**
     * Create a new cache object
     * @param string $location Location string (from SimplePie::$cache_location)
     * @param string $name Unique ID for the cache
     * @param Base::TYPE_FEED|Base::TYPE_IMAGE $type Either TYPE_FEED for SimplePie data, or TYPE_IMAGE for image data
     */
    public function __construct(string $location, string $name, $type)
    {
        $this->options = [
            'host'   => '127.0.0.1',
            'port'   => 11211,
            'extras' => [
                'timeout' => 3600, // one hour
                'prefix'  => 'simplepie_',
            ],
        ];
        $this->options = array_replace_recursive($this->options, \SimplePie\Cache::parse_URL($location));

        $this->name = $this->options['extras']['prefix'] . md5("$name:$type");

        $this->cache = new NativeMemcached();
        $this->cache->addServer($this->options['host'], (int)$this->options['port']);
    }

    /**
     * Save data to the cache
     * @param array<mixed>|\SimplePie\SimplePie $data Data to store in the cache. If passed a SimplePie object, only cache the $data property
     * @return bool Successfulness
     */
    public function save($data)
    {
        if ($data instanceof \SimplePie\SimplePie) {
            $data = $data->data;
        }

        return $this->setData(serialize($data));
    }

    /**
     * Retrieve the data saved to the cache
     * @return array<mixed>|false Data for SimplePie::$data
     */
    public function load()
    {
        $data = $this->cache->get($this->name);

        if ($data !== false) {
            return unserialize($data);
        }
        return false;
    }

    /**
     * Retrieve the last modified time for the cache
     * @return int Timestamp
     */
    public function mtime()
    {
        $data = $this->cache->get($this->name . '_mtime');
        return (int) $data;
    }

    /**
     * Set the last modified time to the current time
     * @return bool Success status
     */
    public function touch()
    {
        $data = $this->cache->get($this->name);
        return $this->setData($data);
    }

    /**
     * Remove the cache
     * @return bool Success status
     */
    public function unlink()
    {
        return $this->cache->delete($this->name, 0);
    }

    /**
     * Set the last modified time and data to NativeMemcached
     * @param string|false $data
     * @return bool Success status
     */
    private function setData($data): bool
    {
        if ($data !== false) {
            $this->cache->set($this->name . '_mtime', time(), (int)$this->options['extras']['timeout']);
            return $this->cache->set($this->name, $data, (int)$this->options['extras']['timeout']);
        }

        return false;
    }
}

class_alias('SimplePie\Cache\Memcached', 'SimplePie_Cache_Memcached');

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