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 Version : 7.4.33
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Directory :  /home/stando/www/wp-content/plugins/w3-total-cache/

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Current File : //home/stando/www/wp-content/plugins/w3-total-cache/ObjectCache_WpObjectCache.php
<?php
namespace W3TC;

class ObjectCache_WpObjectCache {
	private $_config = null;
	private $_default_cache;
	private $_caches = array();
	private $_cache_by_group = array();

	function __construct() {
		$this->_config = Dispatcher::config();
		$this->_default_cache = Dispatcher::component(
			'ObjectCache_WpObjectCache_Regular' );
		$this->_caches[] = $this->_default_cache;
	}

	/**
	 * Registers cache object so that its used for specific groups of
	 * object cache instead of default cache
	 */
	public function register_cache( $cache, $use_for_object_groups ) {
		$this->_caches[] = $cache;
		foreach ( $use_for_object_groups as $group )
			$this->_cache_by_group[$group] = $cache;
	}

	/**
	 * Get from the cache
	 *
	 * @param string  $id
	 * @param string  $group
	 * @return mixed
	 */
	function get( $id, $group = 'default', $force = false, &$found = null ) {
		$cache = $this->_get_engine( $group );
		return $cache->get( $id, $group, $force, $found );
	}

	/**
	 * Set to the cache
	 *
	 * @param string  $id
	 * @param mixed   $data
	 * @param string  $group
	 * @param integer $expire
	 * @return boolean
	 */
	function set( $id, $data, $group = 'default', $expire = 0 ) {
		$cache = $this->_get_engine( $group );
		return $cache->set( $id, $data, $group, $expire );
	}

	/**
	 * Delete from the cache
	 *
	 * @param string  $id
	 * @param string  $group
	 * @param bool    $force
	 * @return boolean
	 */
	function delete( $id, $group = 'default', $force = false ) {
		$cache = $this->_get_engine( $group );
		return $cache->delete( $id, $group, $force );
	}

	/**
	 * Add to the cache
	 *
	 * @param string  $id
	 * @param mixed   $data
	 * @param string  $group
	 * @param integer $expire
	 * @return boolean
	 */
	function add( $id, $data, $group = 'default', $expire = 0 ) {
		$cache = $this->_get_engine( $group );
		return $cache->add( $id, $data, $group, $expire );
	}

	/**
	 * Replace in the cache
	 *
	 * @param string  $id
	 * @param mixed   $data
	 * @param string  $group
	 * @param integer $expire
	 * @return boolean
	 */
	function replace( $id, $data, $group = 'default', $expire = 0 ) {
		$cache = $this->_get_engine( $group );
		return $cache->replace( $id, $data, $group, $expire );
	}

	/**
	 * Reset keys
	 *
	 * @return boolean
	 */
	function reset() {
		$result = true;
		foreach ( $this->_caches as $engine )
			$result = $result && $engine->reset();
		return $result;
	}

	/**
	 * Flush cache
	 *
	 * @return boolean
	 */
	function flush() {
		$result = true;
		foreach ( $this->_caches as $engine )
			$result = $result && $engine->flush();
		return $result;
	}

	/**
	 * Add global groups
	 *
	 * @param array   $groups
	 * @return void
	 */
	function add_global_groups( $groups ) {
		if ( !is_array( $groups ) )
			$groups = array( $groups );

		foreach ( $groups as $group ) {
			$cache = $this->_get_engine( $group );
			$cache->add_global_groups( array( $group ) );
		}
	}

	/**
	 * Add non-persistent groups
	 *
	 * @param array   $groups
	 * @return void
	 */
	function add_nonpersistent_groups( $groups ) {
		if ( !is_array( $groups ) )
			$groups = array( $groups );

		foreach ( $groups as $group ) {
			$cache = $this->_get_engine( $group );
			$cache->add_nonpersistent_groups( array( $group ) );
		}
	}

	/**
	 * Return engine based on which group the OC value belongs to.
	 *
	 * @param string  $group
	 * @return mixed
	 */
	private function _get_engine( $group = '' ) {
		if ( isset( $this->_cache_by_group[$group] ) )
			return $this->_cache_by_group[$group];

		return $this->_default_cache;
	}

	/**
	 * Decrement numeric cache item's value
	 *
	 * @param int|string $id     The cache key to increment
	 * @param int     $offset The amount by which to decrement the item's value. Default is 1.
	 * @param string  $group  The group the key is in.
	 * @return bool|int False on failure, the item's new value on success.
	 */
	function decr( $id, $offset = 1, $group = 'default' ) {
		$cache = $this->_get_engine( $group );
		return $cache->decr( $id, $offset, $group );
	}

	/**
	 * Increment numeric cache item's value
	 *
	 * @param int|string $id     The cache key to increment
	 * @param int     $offset The amount by which to increment the item's value. Default is 1.
	 * @param string  $group  The group the key is in.
	 * @return false|int False on failure, the item's new value on success.
	 */
	function incr( $id, $offset = 1, $group = 'default' ) {
		$cache = $this->_get_engine( $group );
		return $cache->incr( $id, $offset, $group );
	}

	function switch_to_blog( $blog_id ) {
		foreach ( $this->_caches as $cache )
			$cache->switch_blog( $blog_id );
	}
}

haha - 2025