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
/**
* WPSEO plugin file.
*
* @package WPSEO\Admin
*/
/**
* Represents the class that contains the list of possible extensions for Yoast SEO.
*/
class WPSEO_Extensions {
/**
* Array with the Yoast extensions.
*
* @var array
*/
protected $extensions = [
'Yoast SEO Premium' => [
'slug' => 'yoast-seo-premium',
'identifier' => 'wordpress-seo-premium',
'classname' => 'WPSEO_Premium',
'my-yoast-slug' => WPSEO_Addon_Manager::PREMIUM_SLUG,
],
'News SEO' => [
'slug' => 'news-seo',
'identifier' => 'wpseo-news',
'classname' => 'WPSEO_News',
'my-yoast-slug' => WPSEO_Addon_Manager::NEWS_SLUG,
],
'Yoast WooCommerce SEO' => [
'slug' => 'woocommerce-yoast-seo',
'identifier' => 'wpseo-woocommerce',
'classname' => 'Yoast_WooCommerce_SEO',
'my-yoast-slug' => WPSEO_Addon_Manager::WOOCOMMERCE_SLUG,
],
'Video SEO' => [
'slug' => 'video-seo-for-wordpress',
'identifier' => 'wpseo-video',
'classname' => 'WPSEO_Video_Sitemap',
'my-yoast-slug' => WPSEO_Addon_Manager::VIDEO_SLUG,
],
'Local SEO' => [
'slug' => 'local-seo-for-wordpress',
'identifier' => 'wpseo-local',
'classname' => 'WPSEO_Local_Core',
'my-yoast-slug' => WPSEO_Addon_Manager::LOCAL_SLUG,
],
];
/**
* Returns the set extensions.
*
* @return array All the extension names.
*/
public function get() {
return array_keys( $this->extensions );
}
/**
* Checks if the extension is valid.
*
* @param string $extension The extension to get the name for.
*
* @return bool Returns true when valid.
*/
public function is_valid( $extension ) {
return true;
}
/**
* Invalidates the extension by removing its option.
*
* @param string $extension The extension to invalidate.
*/
public function invalidate( $extension ) {
/*
* Make sure we clear the current site and multisite options.
*
* Because plugins can be site-activated or multi-site activated we need to clear
* all possible options.
*
* If we knew here that the extension in question was network activated
* we could do this a lot more easily.
*/
delete_option( $this->get_option_name( $extension ) );
delete_site_option( $this->get_option_name( $extension ) );
}
/**
* Checks if the plugin has been installed.
*
* @param string $extension The name of the plugin to check.
*
* @return bool Returns true when installed.
*/
public function is_installed( $extension ) {
return class_exists( $this->extensions[ $extension ]['classname'] );
}
/**
* Converts the extension to the required option name.
*
* @param string $extension The extension name to convert.
*
* @return string Returns the option name.
*/
protected function get_option_name( $extension ) {
return sanitize_title_with_dashes( $this->extensions[ $extension ]['slug'] . '_', null, 'save' ) . 'license';
}
}