SimplePie::fetch_data

		// Set up array of possible encodings
		$encodings = array();

		// First check to see if input has been overridden.
		if ($this->input_encoding !== false)
		{
			$encodings[] = strtoupper($this->input_encoding);
		}

		$application_types = array('application/xml', 'application/xml-dtd', 'application/xml-external-parsed-entity');
		$text_types = array('text/xml', 'text/xml-external-parsed-entity');

		// RFC 3023 (only applies to sniffed content)
		if (isset($sniffed))
		{
			if (in_array($sniffed, $application_types) || substr($sniffed, 0, 12) === 'application/' && substr($sniffed, -4) === '+xml')
			{
				if (isset($headers['content-type']) && preg_match('/;\x20?charset=([^;]*)/i', $headers['content-type'], $charset))
				{
					$encodings[] = strtoupper($charset[1]);
				}
				$encodings = array_merge($encodings, $this->registry->call('Misc', 'xml_encoding', array($this->raw_data, &$this->registry)));
				$encodings[] = 'UTF-8';
			}
			elseif (in_array($sniffed, $text_types) || substr($sniffed, 0, 5) === 'text/' && substr($sniffed, -4) === '+xml')
			{
				if (isset($headers['content-type']) && preg_match('/;\x20?charset=([^;]*)/i', $headers['content-type'], $charset))
				{
					$encodings[] = strtoupper($charset[1]);
				}
				$encodings[] = 'US-ASCII';
			}
			// Text MIME-type default
			elseif (substr($sniffed, 0, 5) === 'text/')
			{
				$encodings[] = 'UTF-8';
			}
		}

		// Fallback to XML 1.0 Appendix F.1/UTF-8/ISO-8859-1
		$encodings = array_merge($encodings, $this->registry->call('Misc', 'xml_encoding', array($this->raw_data, &$this->registry)));
		$encodings[] = 'UTF-8';
		$encodings[] = 'ISO-8859-1';

		// There's no point in trying an encoding twice
		$encodings = array_unique($encodings);

		// Loop through each possible encoding, till we return something, or run out of possibilities
		foreach ($encodings as $encoding)
		{
			// Change the encoding to UTF-8 (as we always use UTF-8 internally)
			if ($utf8_data = $this->registry->call('Misc', 'change_encoding', array($this->raw_data, $encoding, 'UTF-8')))
			{
				// Create new parser
				$parser = $this->registry->create('Parser');

				// If it's parsed fine
				if ($parser->parse($utf8_data, 'UTF-8', $this->permanent_url))
				{
					$this->data = $parser->get_data();
					if (!($this->get_type() & ~SIMPLEPIE_TYPE_NONE))
					{
						$this->error = "A feed could not be found at `$this->feed_url`. This does not appear to be a valid RSS or Atom feed.";
						$this->registry->call('Misc', 'error', array($this->error, E_USER_NOTICE, __FILE__, __LINE__));
						return false;
					}

					if (isset($headers))
					{
						$this->data['headers'] = $headers;
					}
					$this->data['build'] = SIMPLEPIE_BUILD;

					// Cache the file if caching is enabled
					if ($cache && !$cache->save($this))
					{
						trigger_error("$this->cache_location is not writable. Make sure you've set the correct relative or absolute path, and that the location is server-writable.", E_USER_WARNING);
					}
					return true;
				}
			}
		}

		if (isset($parser))
		{
			// We have an error, just set SimplePie_Misc::error to it and quit
			$this->error = $this->feed_url;
			$this->error .= sprintf(' is invalid XML, likely due to invalid characters. XML error: %s at line %d, column %d', $parser->get_error_string(), $parser->get_current_line(), $parser->get_current_column());
		}
		else
		{
			$this->error = 'The data could not be converted to UTF-8.';
			if (!extension_loaded('mbstring') && !extension_loaded('iconv') && !class_exists('\UConverter')) {
				$this->error .= ' You MUST have either the iconv, mbstring or intl (PHP 5.5+) extension installed and enabled.';
			} else {
				$missingExtensions = array();
				if (!extension_loaded('iconv')) {
					$missingExtensions[] = 'iconv';
				}
				if (!extension_loaded('mbstring')) {
					$missingExtensions[] = 'mbstring';
				}
				if (!class_exists('\UConverter')) {
					$missingExtensions[] = 'intl (PHP 5.5+)';
				}
				$this->error .= ' Try installing/enabling the ' . implode(' or ', $missingExtensions) . ' extension.';
			}
		}

		$this->registry->call('Misc', 'error', array($this->error, E_USER_NOTICE, __FILE__, __LINE__));

		return false;
	}

	/**
	 * Fetch the data via SimplePie_File
	 *
	 * If the data is already cached, attempt to fetch it from there instead
	 * @param SimplePie_Cache|false $cache Cache handler, or false to not load from the cache
	 * @return array|true Returns true if the data was loaded from the cache, or an array of HTTP headers and sniffed type
	 */
	protected function fetch_data(&$cache)
	{
		// If it's enabled, use the cache
		if ($cache)
		{
			// Load the Cache
			$this->data = $cache->load();
			if (!empty($this->data))
			{
				// If the cache is for an outdated build of SimplePie
				if (!isset($this->data['build']) || $this->data['build'] !== SIMPLEPIE_BUILD)
				{
					$cache->unlink();
					$this->data = array();
				}
				// If we've hit a collision just rerun it with caching disabled
				elseif (isset($this->data['url']) && $this->data['url'] !== $this->feed_url)
				{
					$cache = false;
					$this->data = array();
				}
				// If we've got a non feed_url stored (if the page isn't actually a feed, or is a redirect) use that URL.
				elseif (isset($this->data['feed_url']))
				{
					// If the autodiscovery cache is still valid use it.
					if ($cache->mtime() + $this->autodiscovery_cache_duration > time())
					{
						// Do not need to do feed autodiscovery yet.
						if ($this->data['feed_url'] !== $this->data['url'])
						{
							$this->set_feed_url($this->data['feed_url']);
							return $this->init();
						}