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/wp-contentTZh/plugins/elementor/core/base/background-process/wp-async-request.php
<?php
namespace Elementor\Core\Base\BackgroundProcess;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Link https://github.com/A5hleyRich/wp-background-processing GPL v2.0
 *
 * WP Async Request
 *
 * @package WP-Background-Processing
 */

/**
 * Abstract WP_Async_Request class.
 *
 * @abstract
 */
abstract class WP_Async_Request {

	/**
	 * Prefix
	 *
	 * (default value: 'wp')
	 *
	 * @var string
	 * @access protected
	 */
	protected $prefix = 'wp';

	/**
	 * Action
	 *
	 * (default value: 'async_request')
	 *
	 * @var string
	 * @access protected
	 */
	protected $action = 'async_request';

	/**
	 * Identifier
	 *
	 * @var mixed
	 * @access protected
	 */
	protected $identifier;

	/**
	 * Data
	 *
	 * (default value: [])
	 *
	 * @var array
	 * @access protected
	 */
	protected $data = [];

	/**
	 * Initiate new async request
	 */
	public function __construct() {
		$this->identifier = $this->prefix . '_' . $this->action;

		add_action( 'wp_ajax_' . $this->identifier, [ $this, 'maybe_handle' ] );
		add_action( 'wp_ajax_nopriv_' . $this->identifier, [ $this, 'maybe_handle' ] );
	}

	/**
	 * Set data used during the request
	 *
	 * @param array $data Data.
	 *
	 * @return $this
	 */
	public function data( $data ) {
		$this->data = $data;

		return $this;
	}

	/**
	 * Dispatch the async request
	 *
	 * @return array|\WP_Error
	 */
	public function dispatch() {
		$url  = add_query_arg( $this->get_query_args(), $this->get_query_url() );
		$args = $this->get_post_args();

		return wp_remote_post( esc_url_raw( $url ), $args );
	}

	/**
	 * Get query args
	 *
	 * @return array
	 */
	protected function get_query_args() {
		if ( property_exists( $this, 'query_args' ) ) {
			return $this->query_args;
		}

		return [
			'action' => $this->identifier,
			'nonce'  => wp_create_nonce( $this->identifier ),
		];
	}

	/**
	 * Get query URL
	 *
	 * @return string
	 */
	protected function get_query_url() {
		if ( property_exists( $this, 'query_url' ) ) {
			return $this->query_url;
		}

		return admin_url( 'admin-ajax.php' );
	}

	/**
	 * Get post args
	 *
	 * @return array
	 */
	protected function get_post_args() {
		if ( property_exists( $this, 'post_args' ) ) {
			return $this->post_args;
		}

		return [
			'timeout'   => 0.01,
			'blocking'  => false,
			'body'      => $this->data,
			'cookies'   => $_COOKIE,
			/** This filter is documented in wp-includes/class-wp-http-streams.php */
			'sslverify' => apply_filters( 'https_local_ssl_verify', false ),
		];
	}

	/**
	 * Maybe handle
	 *
	 * Check for correct nonce and pass to handler.
	 */
	public function maybe_handle() {
		// Don't lock up other requests while processing
		session_write_close();

		check_ajax_referer( $this->identifier, 'nonce' );

		$this->handle();

		wp_die();
	}

	/**
	 * Handle
	 *
	 * Override this method to perform any actions required
	 * during the async request.
	 */
	abstract protected function handle();
}

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