fetch_rss

函数
fetch_rss ( $url )
参数
  • (string) $url URL to retrieve feed.
    Required:
返回值
  • (MagpieRSS|false) MagpieRSS object on success, false on failure.
定义位置
相关方法
get_rssfetch_feeddo_feed_rssdo_feed_rss2get_sites
引入
1.5.0
弃用
-

fetch_rss – 这个函数检索一个RSS提要并返回一个可用于显示提要内容的项目数组。它接受feed的URL作为其唯一的参数。

基于URL的RSS建立Magpie对象。

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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( $errormsg );
return false;
} // end if ( !MAGPIE_CACHE_ON ) {
} // end fetch_rss()
function fetch_rss ($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( $errormsg ); return false; } // end if ( !MAGPIE_CACHE_ON ) { } // end fetch_rss()
function fetch_rss ($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()

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