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-includes/class-wp-simplepie-file.php
<?php
/**
 * Feed API: WP_SimplePie_File class
 *
 * @package WordPress
 * @subpackage Feed
 * @since 4.7.0
 */

/**
 * Core class for fetching remote files and reading local files with SimplePie.
 *
 * This uses Core's HTTP API to make requests, which gives plugins the ability
 * to hook into the process.
 *
 * @since 2.8.0
 */
#[AllowDynamicProperties]
class WP_SimplePie_File extends SimplePie\File {

	/**
	 * Timeout.
	 *
	 * @var int How long the connection should stay open in seconds.
	 */
	public $timeout = 10;

	/**
	 * Constructor.
	 *
	 * @since 2.8.0
	 * @since 3.2.0 Updated to use a PHP5 constructor.
	 * @since 5.6.1 Multiple headers are concatenated into a comma-separated string,
	 *              rather than remaining an array.
	 *
	 * @param string       $url             Remote file URL.
	 * @param int          $timeout         Optional. How long the connection should stay open in seconds.
	 *                                      Default 10.
	 * @param int          $redirects       Optional. The number of allowed redirects. Default 5.
	 * @param string|array $headers         Optional. Array or string of headers to send with the request.
	 *                                      Default null.
	 * @param string       $useragent       Optional. User-agent value sent. Default null.
	 * @param bool         $force_fsockopen Optional. Whether to force opening internet or unix domain socket
	 *                                      connection or not. Default false.
	 */
	public function __construct( $url, $timeout = 10, $redirects = 5, $headers = null, $useragent = null, $force_fsockopen = false ) {
		$this->url       = $url;
		$this->timeout   = $timeout;
		$this->redirects = $redirects;
		$this->headers   = $headers;
		$this->useragent = $useragent;

		$this->method = SimplePie\SimplePie::FILE_SOURCE_REMOTE;

		if ( preg_match( '/^http(s)?:\/\//i', $url ) ) {
			$args = array(
				'timeout'     => $this->timeout,
				'redirection' => $this->redirects,
			);

			if ( ! empty( $this->headers ) ) {
				$args['headers'] = $this->headers;
			}

			if ( SimplePie\Misc::get_default_useragent() !== $this->useragent ) { // Use default WP user agent unless custom has been specified.
				$args['user-agent'] = $this->useragent;
			}

			$res = wp_safe_remote_request( $url, $args );

			if ( is_wp_error( $res ) ) {
				$this->error   = 'WP HTTP Error: ' . $res->get_error_message();
				$this->success = false;

			} else {
				$this->headers = wp_remote_retrieve_headers( $res );

				if ( $this->headers instanceof \WpOrg\Requests\Utility\CaseInsensitiveDictionary ) {
					$this->headers = $this->headers->getAll();
				}

				/*
				 * SimplePie expects multiple headers to be stored as a comma-separated string,
				 * but `wp_remote_retrieve_headers()` returns them as an array, so they need
				 * to be converted.
				 *
				 * The only exception to that is the `content-type` header, which should ignore
				 * any previous values and only use the last one.
				 *
				 * @see SimplePie\HTTP\Parser::new_line().
				 */
				foreach ( $this->headers as $name => $value ) {
					if ( ! is_array( $value ) ) {
						continue;
					}

					if ( 'content-type' === $name ) {
						$this->headers[ $name ] = array_pop( $value );
					} else {
						$this->headers[ $name ] = implode( ', ', $value );
					}
				}

				$this->body        = wp_remote_retrieve_body( $res );
				$this->status_code = wp_remote_retrieve_response_code( $res );
			}
		} else {
			$this->error   = '';
			$this->success = false;
		}
	}
}

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