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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Current File : /home/rainic/www/oldTZh/wp-content/plugins/wordpress-seo/src/helpers/schema/html-helper.php
<?php

namespace Yoast\WP\SEO\Helpers\Schema;

/**
 * Class HTML_Helper.
 */
class HTML_Helper {

	/**
	 * Sanitizes a HTML string by stripping all tags except headings, breaks, lists, links, paragraphs and formatting.
	 *
	 * @param string $html The original HTML.
	 *
	 * @return string The sanitized HTML.
	 */
	public function sanitize( $html ) {
		if ( ! $this->is_non_empty_string_or_stringable( $html ) ) {
			if ( \is_int( $html ) || \is_float( $html ) ) {
				return (string) $html;
			}

			return '';
		}

		return \strip_tags( $html, '<h1><h2><h3><h4><h5><h6><br><ol><ul><li><a><p><b><strong><i><em>' );
	}

	/**
	 * Strips the tags in a smart way.
	 *
	 * @param string $html The original HTML.
	 *
	 * @return string The sanitized HTML.
	 */
	public function smart_strip_tags( $html ) {
		if ( ! $this->is_non_empty_string_or_stringable( $html ) ) {
			if ( \is_int( $html ) || \is_float( $html ) ) {
				return (string) $html;
			}

			return '';
		}

		// Replace all new lines with spaces.
		$html = \preg_replace( '/(\r|\n)/', ' ', $html );

		// Replace <br> tags with spaces.
		$html = \preg_replace( '/<br(\s*)?\/?>/i', ' ', $html );

		// Replace closing </p> and other tags with the same tag with a space after it, so we don't end up connecting words when we remove them later.
		$html = \preg_replace( '/<\/(p|div|h\d)>/i', '</$1> ', $html );

		// Replace list items with list identifiers so it still looks natural.
		$html = \preg_replace( '/(<li[^>]*>)/i', '$1• ', $html );

		// Strip tags.
		$html = \wp_strip_all_tags( $html );

		// Replace multiple spaces with one space.
		$html = \preg_replace( '!\s+!', ' ', $html );

		return \trim( $html );
	}

	/**
	 * Verifies that the received input is either a string or stringable object.
	 *
	 * @param string $html The original HTML.
	 *
	 * @return bool
	 */
	private function is_non_empty_string_or_stringable( $html ) {
		return ( \is_string( $html ) || ( \is_object( $html ) && \method_exists( $html, '__toString' ) ) ) && ! empty( $html );
	}
}

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