wp-includes/SimplePie/src/SimplePie.php:1857Fetch the data
$cacheSimplePie\Cache\Base|SimplePie\Cache\DataCache|falseSimplePie\array{array<string, protected function fetch_data(&$cache) { if ($cache instanceof Base) { // @trigger_error(sprintf('Providing $cache as "\SimplePie\Cache\Base" in %s() is deprecated since SimplePie 1.8.0, please provide "\SimplePie\Cache\DataCache" implementation instead.', __METHOD__), \E_USER_DEPRECATED); $cache = new BaseDataCache($cache); } // @phpstan-ignore-next-line Enforce PHPDoc type. if ($cache !== false && !$cache instanceof DataCache) { throw new InvalidArgumentException(sprintf( '%s(): Argument #1 ($cache) must be of type %s|false', __METHOD__, DataCache::class ), 1); } $cacheKey = $this->get_cache_filename($this->feed_url); // If it's enabled, use the cache if ($cache) { // Load the Cache $this->data = $cache->get_data($cacheKey, []); if (!empty($this->data)) { // If the cache is for an outdated build of SimplePie if (!isset($this->data['build']) || $this->data['build'] !== Misc::get_build()) { $cache->delete_data($cacheKey); $this->data = []; } // If we've hit a collision just rerun it with caching disabled elseif (isset($this->data['url']) && $this->data['url'] !== $this->feed_url) { $cache = false; $this->data = []; } // If we've got a non feed_url stored (if the page isn't actually a feed, or is a redirect) use that URL. elseif (isset($this->data['feed_url'])) { // Do not need to do feed autodiscovery yet. if ($this->data['feed_url'] !== $this->data['url']) { $this->set_feed_url($this->data['feed_url']); $this->data['url'] = $this->data['feed_url']; $cache->set_data($this->get_cache_filename($this->feed_url), $this->data, $this->autodiscovery_cache_duration); return $this->init(); } $cache->delete_data($this->get_cache_filename($this->feed_url)); $this->data = []; } // Check if the cache has been updated elseif (!isset($this->data['cache_expiration_time']) || $this->data['cache_expiration_time'] < time()) { // Want to know if we tried to send last-modified and/or etag headers // when requesting this file. (Note that it's up to the file to // support this, but we don't always send the headers either.) $this->check_modified = true; if (isset($this->data['headers']['last-modified']) || isset($this->data['headers']['etag'])) { $headers = [ 'Accept' => SimplePie::DEFAULT_HTTP_ACCEPT_HEADER, ]; if (isset($this->data['headers']['last-modified'])) { $headers['if-modified-since'] = $this->data['headers']['last-modified']; } if (isset($this->data['headers']['etag'])) { $headers['if-none-match'] = $this->data['headers']['etag']; } try { $file = $this->get_http_client()->request(Client::METHOD_GET, $this->feed_url, $headers); $this->status_code = $file->get_status_code(); } catch (ClientException $th) { $this->check_modified = false; $this->status_code = 0; if ($this->force_cache_fallback) { $this->data['cache_expiration_time'] = $this->cache_duration + time(); $cache->set_data($cacheKey, $this->data, $this->cache_duration); return true; }One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
array|true to SimplePie\array{array<string,.verified against sourcesrc/wp-includes/SimplePie/src/SimplePie.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.