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　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。 . Prv8 Shell

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Current File : /home/rainic/www/oldTZh/wp-content/plugins/wordpress-seo/src/presenters/canonical-presenter.php

<?php

namespace Yoast\WP\SEO\Presenters;

use Yoast\WP\SEO\Presentations\Indexable_Presentation;

/**
 * Presenter class for the canonical.
 */
class Canonical_Presenter extends Abstract_Indexable_Tag_Presenter {

	/**
	 * The tag key name.
	 *
	 * @var string
	 */
	protected $key = 'canonical';

	/**
	 * The tag format including placeholders.
	 *
	 * @var string
	 */
	protected $tag_format = self::LINK_REL_HREF;

	/**
	 * The method of escaping to use.
	 *
	 * @var string
	 */
	protected $escaping = 'url';

	/**
	 * Run the canonical content through the `wpseo_canonical` filter.
	 *
	 * @return string The filtered canonical.
	 */
	public function get() {
		if ( \in_array( 'noindex', $this->presentation->robots, true ) ) {
			return '';
		}

		/**
		 * Filter: 'wpseo_canonical' - Allow filtering of the canonical URL put out by Yoast SEO.
		 *
		 * @param string                 $canonical    The canonical URL.
		 * @param Indexable_Presentation $presentation The presentation of an indexable.
		 */
		return \urldecode( \trim( (string) \apply_filters( 'wpseo_canonical', $this->presentation->canonical, $this->presentation ) ) );
	}
}

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