SimplePie::init

	 * This is useful for times when your webpages are not being served as
	 * UTF-8. This setting will be obeyed by {@see handle_content_type()}, and
	 * is similar to {@see set_input_encoding()}.
	 *
	 * It should be noted, however, that not all character encodings can support
	 * all characters. If your page is being served as ISO-8859-1 and you try
	 * to display a Japanese feed, you'll likely see garbled characters.
	 * Because of this, it is highly recommended to ensure that your webpages
	 * are served as UTF-8.
	 *
	 * The number of supported character encodings depends on whether your web
	 * host supports {@link http://php.net/mbstring mbstring},
	 * {@link http://php.net/iconv iconv}, or both. See
	 * {@link http://simplepie.org/wiki/faq/Supported_Character_Encodings} for
	 * more information.
	 *
	 * @param string $encoding
	 */
	public function set_output_encoding($encoding = 'UTF-8')
	{
		$this->sanitize->set_output_encoding($encoding);
	}

	public function strip_comments($strip = false)
	{
		$this->sanitize->strip_comments($strip);
	}

	/**
	 * Set element/attribute key/value pairs of HTML attributes
	 * containing URLs that need to be resolved relative to the feed
	 *
	 * Defaults to |a|@href, |area|@href, |blockquote|@cite, |del|@cite,
	 * |form|@action, |img|@longdesc, |img|@src, |input|@src, |ins|@cite,
	 * |q|@cite
	 *
	 * @since 1.0
	 * @param array|null $element_attribute Element/attribute key/value pairs, null for default
	 */
	public function set_url_replacements($element_attribute = null)
	{
		$this->sanitize->set_url_replacements($element_attribute);
	}

	/**
	 * Set the handler to enable the display of cached images.
	 *
	 * @param string $page Web-accessible path to the handler_image.php file.
	 * @param string $qs The query string that the value should be passed to.
	 */
	public function set_image_handler($page = false, $qs = 'i')
	{
		if ($page !== false)
		{
			$this->sanitize->set_image_handler($page . '?' . $qs . '=');
		}
		else
		{
			$this->image_handler = '';
		}
	}

	/**
	 * Set the limit for items returned per-feed with multifeeds
	 *
	 * @param integer $limit The maximum number of items to return.
	 */
	public function set_item_limit($limit = 0)
	{
		$this->item_limit = (int) $limit;
	}

	/**
	 * Enable throwing exceptions
	 *
	 * @param boolean $enable Should we throw exceptions, or use the old-style error property?
	 */
	public function enable_exceptions($enable = true)
	{
		$this->enable_exceptions = $enable;
	}

	/**
	 * Initialize the feed object
	 *
	 * This is what makes everything happen. Period. This is where all of the
	 * configuration options get processed, feeds are fetched, cached, and
	 * parsed, and all of that other good stuff.
	 *
	 * @return boolean True if successful, false otherwise
	 */
	public function init()
	{
		// Check absolute bare minimum requirements.
		if (!extension_loaded('xml') || !extension_loaded('pcre'))
		{
			$this->error = 'XML or PCRE extensions not loaded!';
			return false;
		}
		// Then check the xml extension is sane (i.e., libxml 2.7.x issue on PHP < 5.2.9 and libxml 2.7.0 to 2.7.2 on any version) if we don't have xmlreader.
		elseif (!extension_loaded('xmlreader'))
		{
			static $xml_is_sane = null;
			if ($xml_is_sane === null)
			{
				$parser_check = xml_parser_create();
				xml_parse_into_struct($parser_check, '<foo>&amp;</foo>', $values);
				xml_parser_free($parser_check);
				$xml_is_sane = isset($values[0]['value']);
			}
			if (!$xml_is_sane)
			{
				return false;
			}
		}

		// The default sanitize class gets set in the constructor, check if it has
		// changed.
		if ($this->registry->get_class('Sanitize') !== 'SimplePie_Sanitize') {
			$this->sanitize = $this->registry->create('Sanitize');
		}
		if (method_exists($this->sanitize, 'set_registry'))
		{
			$this->sanitize->set_registry($this->registry);
		}

		// Pass whatever was set with config options over to the sanitizer.
		// Pass the classes in for legacy support; new classes should use the registry instead
		$this->sanitize->pass_cache_data($this->cache, $this->cache_location, $this->cache_name_function, $this->registry->get_class('Cache'));
		$this->sanitize->pass_file_data($this->registry->get_class('File'), $this->timeout, $this->useragent, $this->force_fsockopen, $this->curl_options);

		if (!empty($this->multifeed_url))
		{
			$i = 0;
			$success = 0;
			$this->multifeed_objects = array();
			$this->error = array();
			foreach ($this->multifeed_url as $url)
			{
				$this->multifeed_objects[$i] = clone $this;
				$this->multifeed_objects[$i]->set_feed_url($url);
				$single_success = $this->multifeed_objects[$i]->init();
				$success |= $single_success;
				if (!$single_success)
				{
					$this->error[$i] = $this->multifeed_objects[$i]->error();
				}
				$i++;
			}
			return (bool) $success;
		}
		elseif ($this->feed_url === null && $this->raw_data === null)
		{
			return false;
		}

		$this->error = null;
		$this->data = array();
		$this->check_modified = false;
		$this->multifeed_objects = array();
		$cache = false;

		if ($this->feed_url !== null)
		{
			$parsed_feed_url = $this->registry->call('Misc', 'parse_url', array($this->feed_url));

			// Decide whether to enable caching
			if ($this->cache && $parsed_feed_url['scheme'] !== '')
			{
				$url = $this->feed_url . ($this->force_feed ? '#force_feed' : '');
				$cache = $this->registry->call('Cache', 'get_handler', array($this->cache_location, call_user_func($this->cache_name_function, $url), 'spc'));
			}

			// Fetch the data via SimplePie_File into $this->raw_data
			if (($fetched = $this->fetch_data($cache)) === true)
			{
				return true;
			}
			elseif ($fetched === false) {
				return false;
			}

			list($headers, $sniffed) = $fetched;