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
namespace Elementor\Modules\AtomicWidgets;
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly.
}
class Cache_Validity {
const CACHE_KEY_PREFIX = 'elementor_atomic_cache_validity-';
public function is_valid( array $keys ): bool {
$root = array_shift( $keys );
$state_item = get_option( self::CACHE_KEY_PREFIX . $root, null );
if ( ! empty( $keys ) ) {
if ( ! $state_item ) {
return false;
}
$state_item = $this->get_nested_item( $state_item, $keys );
}
return $state_item ? $state_item['state'] : false;
}
public function get_meta( array $keys ) {
$root = array_shift( $keys );
$state_item = get_option( self::CACHE_KEY_PREFIX . $root, null );
if ( ! $state_item ) {
return null;
}
$state_item = $this->get_nested_item( $state_item, $keys );
return isset( $state_item['meta'] ) ? $state_item['meta'] : null;
}
public function invalidate( array $keys ): void {
$root = array_shift( $keys );
$state_item = get_option( self::CACHE_KEY_PREFIX . $root, [
'state' => false,
'meta' => null,
'children' => [],
] );
$current_item = &$state_item;
if ( ! empty( $keys ) ) {
$current_item = &$this->get_nested_item( $current_item, $keys );
}
$current_item['state'] = false;
$current_item['meta'] = null;
$this->invalidate_nested_items( $current_item );
update_option( self::CACHE_KEY_PREFIX . $root, $state_item );
}
public function validate( array $keys, $meta = null ): void {
$root = array_shift( $keys );
$state_item = get_option( self::CACHE_KEY_PREFIX . $root, [
'state' => false,
'children' => [],
] );
$current_item = &$state_item;
if ( ! empty( $keys ) ) {
$current_item = &$this->get_nested_item( $current_item, $keys );
}
$current_item['state'] = true;
$current_item['meta'] = $meta;
update_option( self::CACHE_KEY_PREFIX . $root, $state_item );
}
/**
* @param array{state: boolean, meta: array<string, mixed> | null, children: array<string, self>} $root_item
* @param array<string> $keys
* @return array{state: boolean, meta: array<string, mixed> | null, children: array<string, self>}
*/
private function &get_nested_item( array &$root_item, array $keys ): array {
$current_item = &$root_item;
while ( ! empty( $keys ) ) {
$key = array_shift( $keys );
if ( ! isset( $current_item['children'][ $key ] ) ) {
$current_item['children'][ $key ] = [
'state' => false,
'meta' => null,
'children' => [],
];
}
$current_item = &$current_item['children'][ $key ];
}
return $current_item;
}
private function invalidate_nested_items( array &$root_item ): void {
foreach ( $root_item['children'] as &$child_item ) {
$child_item['state'] = false;
$child_item['meta'] = null;
$this->invalidate_nested_items( $child_item );
}
}
}