^ 回到顶部
  • 人生没有定律,每个人都有自己的节奏
  • 本站wordpress建站教程均通过实践后发布,希望对你有帮助
  • 希望你的坚持,都是因为热爱,而不是因为不甘心
  • 8年wordpress建站经验,5星服务品质
  • 那些不愿意让你吃亏的人,才是真正值得你深交的人,也是值得你付出时间的人
  • 阿里云2核2g仅需86元/年

wordpress函数fetch_rss()用法示例

fetch_rss( string $url )

Build Magpie object based on RSS from URL.


描述


参数

$url

(string)
(Required)
URL to retrieve feed

新用户2核2g仅需86元/年    领取1153套模板    免费cdn流量包    ¥3188礼包


返回值

(bool|MagpieRSS) false on failure or MagpieRSS object on success.


源代码

File: wp-includes/rss.php

function fetch_rss ($url) {
	// initialize constants
	init();

	if ( !isset($url) ) {
		// error("fetch_rss called without a url");
		return false;
	}

	// if cache is disabled
	if ( !MAGPIE_CACHE_ON ) {
		// fetch file, and parse it
		$resp = _fetch_remote_file( $url );
		if ( is_success( $resp->status ) ) {
			return _response_to_rss( $resp );
		}
		else {
			// error("Failed to fetch $url and cache is off");
			return false;
		}
	}
	// else cache is ON
	else {
		// Flow
		// 1. check cache
		// 2. if there is a hit, make sure it's fresh
		// 3. if cached obj fails freshness check, fetch remote
		// 4. if remote fails, return stale object, or error

		$cache = new RSSCache( MAGPIE_CACHE_DIR, MAGPIE_CACHE_AGE );

		if (MAGPIE_DEBUG and $cache->ERROR) {
			debug($cache->ERROR, E_USER_WARNING);
		}

		$cache_status 	 = 0;		// response of check_cache
		$request_headers = array(); // HTTP headers to send with fetch
		$rss 			 = 0;		// parsed RSS object
		$errormsg		 = 0;		// errors, if any

		if (!$cache->ERROR) {
			// return cache HIT, MISS, or STALE
			$cache_status = $cache->check_cache( $url );
		}

		// if object cached, and cache is fresh, return cached obj
		if ( $cache_status == 'HIT' ) {
			$rss = $cache->get( $url );
			if ( isset($rss) and $rss ) {
				$rss->from_cache = 1;
				if ( MAGPIE_DEBUG > 1) {
				debug("MagpieRSS: Cache HIT", E_USER_NOTICE);
			}
				return $rss;
			}
		}

		// else attempt a conditional get

		// set up headers
		if ( $cache_status == 'STALE' ) {
			$rss = $cache->get( $url );
			if ( isset($rss->etag) and $rss->last_modified ) {
				$request_headers['If-None-Match'] = $rss->etag;
				$request_headers['If-Last-Modified'] = $rss->last_modified;
			}
		}

		$resp = _fetch_remote_file( $url, $request_headers );

		if (isset($resp) and $resp) {
			if ($resp->status == '304' ) {
				// we have the most current copy
				if ( MAGPIE_DEBUG > 1) {
					debug("Got 304 for $url");
				}
				// reset cache on 304 (at minutillo insistent prodding)
				$cache->set($url, $rss);
				return $rss;
			}
			elseif ( is_success( $resp->status ) ) {
				$rss = _response_to_rss( $resp );
				if ( $rss ) {
					if (MAGPIE_DEBUG > 1) {
debug("Fetch successful");
					}
					// add object to cache
					$cache->set( $url, $rss );
					return $rss;
				}
			}
			else {
				$errormsg = "Failed to fetch $url. ";
				if ( $resp->error ) {
					# compensate for Snoopy's annoying habbit to tacking
					# on '\n'
					$http_error = substr($resp->error, 0, -2);
					$errormsg .= "(HTTP Error: $http_error)";
				}
				else {
					$errormsg .=  "(HTTP Response: " . $resp->response_code .')';
				}
			}
		}
		else {
			$errormsg = "Unable to retrieve RSS file for unknown reasons.";
		}

		// else fetch failed

		// attempt to return cached object
		if ($rss) {
			if ( MAGPIE_DEBUG ) {
				debug("Returning STALE object for $url");
			}
			return $rss;
		}

		// else we totally failed
		// error( $errormsg );

		return false;

	} // end if ( !MAGPIE_CACHE_ON ) {
} // end fetch_rss()

更新日志

Version 描述
1.5.0 Introduced.

相关函数

Uses

  • wp-includes/rss.php:
    RSSCache::__construct()
  • wp-includes/rss.php:
    init()
  • wp-includes/rss.php:
    _fetch_remote_file()
  • wp-includes/rss.php:
    is_success()
  • wp-includes/rss.php:
    _response_to_rss()

Used By

  • wp-includes/rss.php:
    wp_rss()
  • wp-includes/rss.php:
    get_rss()

让小雨知道,这篇文章帮到了你
扫码关注微信公众号zs40086(微搜片)随时随地微信看片,抢先福利电影等你来

热门推荐

如有疑问,请前往问答中心反馈!

反馈