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wp-includes/class-simplepie.php

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<?php
if ( ! class_exists( 'SimplePie', false ) ) :

// Load classes we will need.
require ABSPATH . WPINC . '/SimplePie/Misc.php';
require ABSPATH . WPINC . '/SimplePie/Cache.php';
require ABSPATH . WPINC . '/SimplePie/File.php';
require ABSPATH . WPINC . '/SimplePie/Sanitize.php';
require ABSPATH . WPINC . '/SimplePie/Registry.php';
require ABSPATH . WPINC . '/SimplePie/IRI.php';
require ABSPATH . WPINC . '/SimplePie/Locator.php';
require ABSPATH . WPINC . '/SimplePie/Content/Type/Sniffer.php';
require ABSPATH . WPINC . '/SimplePie/XML/Declaration/Parser.php';
require ABSPATH . WPINC . '/SimplePie/Parser.php';
require ABSPATH . WPINC . '/SimplePie/Item.php';
require ABSPATH . WPINC . '/SimplePie/Parse/Date.php';
require ABSPATH . WPINC . '/SimplePie/Author.php';

/**
 * WordPress autoloader for SimplePie.
 *
 * @since 3.5.0
 *
 * @param string $class Class name.
 */
function wp_simplepie_autoload( $class ) {
    if ( ! str_starts_with( $class, 'SimplePie_' ) )
        return;

    $file = ABSPATH . WPINC . '/' . str_replace( '_', '/', $class ) . '.php';
    include $file;
}

/**
 * We autoload classes we may not need.
 */
spl_autoload_register( 'wp_simplepie_autoload' );

/**
 * SimplePie
 *
 * A PHP-Based RSS and Atom Feed Framework.
 * Takes the hard work out of managing a complete RSS/Atom solution.
 *
 * Copyright (c) 2004-2017, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 *     * Neither the name of the SimplePie Team nor the names of its contributors may be used
 *       to endorse or promote products derived from this software without specific prior
 *       written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @package SimplePie
 * @version 1.5.8
 * @copyright 2004-2017 Ryan Parman, Sam Sneddon, Ryan McCue
 * @author Ryan Parman
 * @author Sam Sneddon
 * @author Ryan McCue
 * @link http://simplepie.org/ SimplePie
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */

/**
 * SimplePie Name
 */
define('SIMPLEPIE_NAME', 'SimplePie');

/**
 * SimplePie Version
 */
define('SIMPLEPIE_VERSION', '1.5.8');

/**
 * SimplePie Build
 * @todo Hardcode for release (there's no need to have to call SimplePie_Misc::get_build() only every load of simplepie.inc)
 */
define('SIMPLEPIE_BUILD', gmdate('YmdHis', SimplePie_Misc::get_build()));

/**
 * SimplePie Website URL
 */
define('SIMPLEPIE_URL', 'http://simplepie.org');

/**
 * SimplePie Useragent
 * @see SimplePie::set_useragent()
 */
define('SIMPLEPIE_USERAGENT', SIMPLEPIE_NAME . '/' . SIMPLEPIE_VERSION . ' (Feed Parser; ' . SIMPLEPIE_URL . '; Allow like Gecko) Build/' . SIMPLEPIE_BUILD);

/**
 * SimplePie Linkback
 */
define('SIMPLEPIE_LINKBACK', '<a href="' . SIMPLEPIE_URL . '" title="' . SIMPLEPIE_NAME . ' ' . SIMPLEPIE_VERSION . '">' . SIMPLEPIE_NAME . '</a>');

/**
 * No Autodiscovery
 * @see SimplePie::set_autodiscovery_level()
 */
define('SIMPLEPIE_LOCATOR_NONE', 0);

/**
 * Feed Link Element Autodiscovery
 * @see SimplePie::set_autodiscovery_level()
 */
define('SIMPLEPIE_LOCATOR_AUTODISCOVERY', 1);

/**
 * Local Feed Extension Autodiscovery
 * @see SimplePie::set_autodiscovery_level()
 */
define('SIMPLEPIE_LOCATOR_LOCAL_EXTENSION', 2);

/**
 * Local Feed Body Autodiscovery
 * @see SimplePie::set_autodiscovery_level()
 */
define('SIMPLEPIE_LOCATOR_LOCAL_BODY', 4);

/**
 * Remote Feed Extension Autodiscovery
 * @see SimplePie::set_autodiscovery_level()
 */
define('SIMPLEPIE_LOCATOR_REMOTE_EXTENSION', 8);

/**
 * Remote Feed Body Autodiscovery
 * @see SimplePie::set_autodiscovery_level()
 */
define('SIMPLEPIE_LOCATOR_REMOTE_BODY', 16);

/**
 * All Feed Autodiscovery
 * @see SimplePie::set_autodiscovery_level()
 */
define('SIMPLEPIE_LOCATOR_ALL', 31);

/**
 * No known feed type
 */
define('SIMPLEPIE_TYPE_NONE', 0);

/**
 * RSS 0.90
 */
define('SIMPLEPIE_TYPE_RSS_090', 1);

/**
 * RSS 0.91 (Netscape)
 */
define('SIMPLEPIE_TYPE_RSS_091_NETSCAPE', 2);

/**
 * RSS 0.91 (Userland)
 */
define('SIMPLEPIE_TYPE_RSS_091_USERLAND', 4);

/**
 * RSS 0.91 (both Netscape and Userland)
 */
define('SIMPLEPIE_TYPE_RSS_091', 6);

/**
 * RSS 0.92
 */
define('SIMPLEPIE_TYPE_RSS_092', 8);

/**
 * RSS 0.93
 */
define('SIMPLEPIE_TYPE_RSS_093', 16);

/**
 * RSS 0.94
 */
define('SIMPLEPIE_TYPE_RSS_094', 32);

/**
 * RSS 1.0
 */
define('SIMPLEPIE_TYPE_RSS_10', 64);

/**
 * RSS 2.0
 */
define('SIMPLEPIE_TYPE_RSS_20', 128);

/**
 * RDF-based RSS
 */
define('SIMPLEPIE_TYPE_RSS_RDF', 65);

/**
 * Non-RDF-based RSS (truly intended as syndication format)
 */
define('SIMPLEPIE_TYPE_RSS_SYNDICATION', 190);

/**
 * All RSS
 */
define('SIMPLEPIE_TYPE_RSS_ALL', 255);

/**
 * Atom 0.3
 */
define('SIMPLEPIE_TYPE_ATOM_03', 256);

/**
 * Atom 1.0
 */
define('SIMPLEPIE_TYPE_ATOM_10', 512);

/**
 * All Atom
 */
define('SIMPLEPIE_TYPE_ATOM_ALL', 768);

/**
 * All feed types
 */
define('SIMPLEPIE_TYPE_ALL', 1023);

/**
 * No construct
 */
define('SIMPLEPIE_CONSTRUCT_NONE', 0);

/**
 * Text construct
 */
define('SIMPLEPIE_CONSTRUCT_TEXT', 1);

/**
 * HTML construct
 */
define('SIMPLEPIE_CONSTRUCT_HTML', 2);

/**
 * XHTML construct
 */
define('SIMPLEPIE_CONSTRUCT_XHTML', 4);

/**
 * base64-encoded construct
 */
define('SIMPLEPIE_CONSTRUCT_BASE64', 8);

/**
 * IRI construct
 */
define('SIMPLEPIE_CONSTRUCT_IRI', 16);

/**
 * A construct that might be HTML
 */
define('SIMPLEPIE_CONSTRUCT_MAYBE_HTML', 32);

/**
 * All constructs
 */
define('SIMPLEPIE_CONSTRUCT_ALL', 63);

/**
 * Don't change case
 */
define('SIMPLEPIE_SAME_CASE', 1);

/**
 * Change to lowercase
 */
define('SIMPLEPIE_LOWERCASE', 2);

/**
 * Change to uppercase
 */
define('SIMPLEPIE_UPPERCASE', 4);

/**
 * PCRE for HTML attributes
 */
define('SIMPLEPIE_PCRE_HTML_ATTRIBUTE', '((?:[\x09\x0A\x0B\x0C\x0D\x20]+[^\x09\x0A\x0B\x0C\x0D\x20\x2F\x3E][^\x09\x0A\x0B\x0C\x0D\x20\x2F\x3D\x3E]*(?:[\x09\x0A\x0B\x0C\x0D\x20]*=[\x09\x0A\x0B\x0C\x0D\x20]*(?:"(?:[^"]*)"|\'(?:[^\']*)\'|(?:[^\x09\x0A\x0B\x0C\x0D\x20\x22\x27\x3E][^\x09\x0A\x0B\x0C\x0D\x20\x3E]*)?))?)*)[\x09\x0A\x0B\x0C\x0D\x20]*');

/**
 * PCRE for XML attributes
 */
define('SIMPLEPIE_PCRE_XML_ATTRIBUTE', '((?:\s+(?:(?:[^\s:]+:)?[^\s:]+)\s*=\s*(?:"(?:[^"]*)"|\'(?:[^\']*)\'))*)\s*');

/**
 * XML Namespace
 */
define('SIMPLEPIE_NAMESPACE_XML', 'http://www.w3.org/XML/1998/namespace');

/**
 * Atom 1.0 Namespace
 */
define('SIMPLEPIE_NAMESPACE_ATOM_10', 'http://www.w3.org/2005/Atom');

/**
 * Atom 0.3 Namespace
 */
define('SIMPLEPIE_NAMESPACE_ATOM_03', 'http://purl.org/atom/ns#');

/**
 * RDF Namespace
 */
define('SIMPLEPIE_NAMESPACE_RDF', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#');

/**
 * RSS 0.90 Namespace
 */
define('SIMPLEPIE_NAMESPACE_RSS_090', 'http://my.netscape.com/rdf/simple/0.9/');

/**
 * RSS 1.0 Namespace
 */
define('SIMPLEPIE_NAMESPACE_RSS_10', 'http://purl.org/rss/1.0/');

/**
 * RSS 1.0 Content Module Namespace
 */
define('SIMPLEPIE_NAMESPACE_RSS_10_MODULES_CONTENT', 'http://purl.org/rss/1.0/modules/content/');

/**
 * RSS 2.0 Namespace
 */
define('SIMPLEPIE_NAMESPACE_RSS_20', '');

/**
 * DC 1.0 Namespace
 */
define('SIMPLEPIE_NAMESPACE_DC_10', 'http://purl.org/dc/elements/1.0/');

/**
 * DC 1.1 Namespace
 */
define('SIMPLEPIE_NAMESPACE_DC_11', 'http://purl.org/dc/elements/1.1/');

/**
 * W3C Basic Geo (WGS84 lat/long) Vocabulary Namespace
 */
define('SIMPLEPIE_NAMESPACE_W3C_BASIC_GEO', 'http://www.w3.org/2003/01/geo/wgs84_pos#');

/**
 * GeoRSS Namespace
 */
define('SIMPLEPIE_NAMESPACE_GEORSS', 'http://www.georss.org/georss');

/**
 * Media RSS Namespace
 */
define('SIMPLEPIE_NAMESPACE_MEDIARSS', 'http://search.yahoo.com/mrss/');

/**
 * Wrong Media RSS Namespace. Caused by a long-standing typo in the spec.
 */
define('SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG', 'http://search.yahoo.com/mrss');

/**
 * Wrong Media RSS Namespace #2. New namespace introduced in Media RSS 1.5.
 */
define('SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG2', 'http://video.search.yahoo.com/mrss');

/**
 * Wrong Media RSS Namespace #3. A possible typo of the Media RSS 1.5 namespace.
 */
define('SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG3', 'http://video.search.yahoo.com/mrss/');

/**
 * Wrong Media RSS Namespace #4. New spec location after the RSS Advisory Board takes it over, but not a valid namespace.
 */
define('SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG4', 'http://www.rssboard.org/media-rss');

/**
 * Wrong Media RSS Namespace #5. A possible typo of the RSS Advisory Board URL.
 */
define('SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG5', 'http://www.rssboard.org/media-rss/');

/**
 * iTunes RSS Namespace
 */
define('SIMPLEPIE_NAMESPACE_ITUNES', 'http://www.itunes.com/dtds/podcast-1.0.dtd');

/**
 * XHTML Namespace
 */
define('SIMPLEPIE_NAMESPACE_XHTML', 'http://www.w3.org/1999/xhtml');

/**
 * IANA Link Relations Registry
 */
define('SIMPLEPIE_IANA_LINK_RELATIONS_REGISTRY', 'http://www.iana.org/assignments/relation/');

/**
 * No file source
 */
define('SIMPLEPIE_FILE_SOURCE_NONE', 0);

/**
 * Remote file source
 */
define('SIMPLEPIE_FILE_SOURCE_REMOTE', 1);

/**
 * Local file source
 */
define('SIMPLEPIE_FILE_SOURCE_LOCAL', 2);

/**
 * fsockopen() file source
 */
define('SIMPLEPIE_FILE_SOURCE_FSOCKOPEN', 4);

/**
 * cURL file source
 */
define('SIMPLEPIE_FILE_SOURCE_CURL', 8);

/**
 * file_get_contents() file source
 */
define('SIMPLEPIE_FILE_SOURCE_FILE_GET_CONTENTS', 16);



/**
 * SimplePie
 *
 * @package SimplePie
 * @subpackage API
 */
class SimplePie
{
    /**
     * @var array Raw data
     * @access private
     */
    public $data = array();

    /**
     * @var mixed Error string
     * @access private
     */
    public $error;

    /**
     * @var int HTTP status code
     * @see SimplePie::status_code()
     * @access private
     */
    public $status_code;

    /**
     * @var object Instance of SimplePie_Sanitize (or other class)
     * @see SimplePie::set_sanitize_class()
     * @access private
     */
    public $sanitize;

    /**
     * @var string SimplePie Useragent
     * @see SimplePie::set_useragent()
     * @access private
     */
    public $useragent = SIMPLEPIE_USERAGENT;

    /**
     * @var string Feed URL
     * @see SimplePie::set_feed_url()
     * @access private
     */
    public $feed_url;

    /**
     * @var string Original feed URL, or new feed URL iff HTTP 301 Moved Permanently
     * @see SimplePie::subscribe_url()
     * @access private
     */
    public $permanent_url = null;

    /**
     * @var object Instance of SimplePie_File to use as a feed
     * @see SimplePie::set_file()
     * @access private
     */
    public $file;

    /**
     * @var string Raw feed data
     * @see SimplePie::set_raw_data()
     * @access private
     */
    public $raw_data;

    /**
     * @var int Timeout for fetching remote files
     * @see SimplePie::set_timeout()
     * @access private
     */
    public $timeout = 10;

    /**
     * @var array Custom curl options
     * @see SimplePie::set_curl_options()
     * @access private
     */
    public $curl_options = array();

    /**
     * @var bool Forces fsockopen() to be used for remote files instead
     * of cURL, even if a new enough version is installed
     * @see SimplePie::force_fsockopen()
     * @access private
     */
    public $force_fsockopen = false;

    /**
     * @var bool Force the given data/URL to be treated as a feed no matter what
     * it appears like
     * @see SimplePie::force_feed()
     * @access private
     */
    public $force_feed = false;

    /**
     * @var bool Enable/Disable Caching
     * @see SimplePie::enable_cache()
     * @access private
     */
    public $cache = true;

    /**
     * @var bool Force SimplePie to fallback to expired cache, if enabled,
     * when feed is unavailable.
     * @see SimplePie::force_cache_fallback()
     * @access private
     */
    public $force_cache_fallback = false;

    /**
     * @var int Cache duration (in seconds)
     * @see SimplePie::set_cache_duration()
     * @access private
     */
    public $cache_duration = 3600;

    /**
     * @var int Auto-discovery cache duration (in seconds)
     * @see SimplePie::set_autodiscovery_cache_duration()
     * @access private
     */
    public $autodiscovery_cache_duration = 604800; // 7 Days.

    /**
     * @var string Cache location (relative to executing script)
     * @see SimplePie::set_cache_location()
     * @access private
     */
    public $cache_location = './cache';

    /**
     * @var string Function that creates the cache filename
     * @see SimplePie::set_cache_name_function()
     * @access private
     */
    public $cache_name_function = 'md5';

    /**
     * @var bool Reorder feed by date descending
     * @see SimplePie::enable_order_by_date()
     * @access private
     */
    public $order_by_date = true;

    /**
     * @var mixed Force input encoding to be set to the follow value
     * (false, or anything type-cast to false, disables this feature)
     * @see SimplePie::set_input_encoding()
     * @access private
     */
    public $input_encoding = false;

    /**
     * @var int Feed Autodiscovery Level
     * @see SimplePie::set_autodiscovery_level()
     * @access private
     */
    public $autodiscovery = SIMPLEPIE_LOCATOR_ALL;

    /**
     * Class registry object
     *
     * @var SimplePie_Registry
     */
    public $registry;

    /**
     * @var int Maximum number of feeds to check with autodiscovery
     * @see SimplePie::set_max_checked_feeds()
     * @access private
     */
    public $max_checked_feeds = 10;

    /**
     * @var array All the feeds found during the autodiscovery process
     * @see SimplePie::get_all_discovered_feeds()
     * @access private
     */
    public $all_discovered_feeds = array();

    /**
     * @var string Web-accessible path to the handler_image.php file.
     * @see SimplePie::set_image_handler()
     * @access private
     */
    public $image_handler = '';

    /**
     * @var array Stores the URLs when multiple feeds are being initialized.
     * @see SimplePie::set_feed_url()
     * @access private
     */
    public $multifeed_url = array();

    /**
     * @var array Stores SimplePie objects when multiple feeds initialized.
     * @access private
     */
    public $multifeed_objects = array();

    /**
     * @var array Stores the get_object_vars() array for use with multifeeds.
     * @see SimplePie::set_feed_url()
     * @access private
     */
    public $config_settings = null;

    /**
     * @var integer Stores the number of items to return per-feed with multifeeds.
     * @see SimplePie::set_item_limit()
     * @access private
     */
    public $item_limit = 0;

    /**
     * @var bool Stores if last-modified and/or etag headers were sent with the
     * request when checking a feed.
     */
    public $check_modified = false;

    /**
     * @var array Stores the default attributes to be stripped by strip_attributes().
     * @see SimplePie::strip_attributes()
     * @access private
     */
    public $strip_attributes = array('bgsound', 'class', 'expr', 'id', 'style', 'onclick', 'onerror', 'onfinish', 'onmouseover', 'onmouseout', 'onfocus', 'onblur', 'lowsrc', 'dynsrc');

    /**
     * @var array Stores the default attributes to add to different tags by add_attributes().
     * @see SimplePie::add_attributes()
     * @access private
     */
    public $add_attributes = array('audio' => array('preload' => 'none'), 'iframe' => array('sandbox' => 'allow-scripts allow-same-origin'), 'video' => array('preload' => 'none'));

    /**
     * @var array Stores the default tags to be stripped by strip_htmltags().
     * @see SimplePie::strip_htmltags()
     * @access private
     */
    public $strip_htmltags = array('base', 'blink', 'body', 'doctype', 'embed', 'font', 'form', 'frame', 'frameset', 'html', 'iframe', 'input', 'marquee', 'meta', 'noscript', 'object', 'param', 'script', 'style');

    /**
     * @var bool Should we throw exceptions, or use the old-style error property?
     * @access private
     */
    public $enable_exceptions = false;

    /**
     * The SimplePie class contains feed level data and options
     *
     * To use SimplePie, create the SimplePie object with no parameters. You can
     * then set configuration options using the provided methods. After setting
     * them, you must initialise the feed using $feed->init(). At that point the
     * object's methods and properties will be available to you.
     *
     * Previously, it was possible to pass in the feed URL along with cache
     * options directly into the constructor. This has been removed as of 1.3 as
     * it caused a lot of confusion.
     *
     * @since 1.0 Preview Release
     */
    public function __construct()
    {
        if (version_compare(PHP_VERSION, '5.6', '<'))
        {
            trigger_error('Please upgrade to PHP 5.6 or newer.');
            die();
        }

        // Other objects, instances created here so we can set options on them
        $this->sanitize = new SimplePie_Sanitize();
        $this->registry = new SimplePie_Registry();

        if (func_num_args() > 0)
        {
            $level = defined('E_USER_DEPRECATED') ? E_USER_DEPRECATED : E_USER_WARNING;
            trigger_error('Passing parameters to the constructor is no longer supported. Please use set_feed_url(), set_cache_location(), and set_cache_duration() directly.', $level);

            $args = func_get_args();
            switch (count($args)) {
                case 3:
                    $this->set_cache_duration($args[2]);
                case 2:
                    $this->set_cache_location($args[1]);
                case 1:
                    $this->set_feed_url($args[0]);
                    $this->init();
            }
        }
    }

    /**
     * Used for converting object to a string
     */
    public function __toString()
    {
        return md5(serialize($this->data));
    }

    /**
     * Remove items that link back to this before destroying this object
     */
    public function __destruct()
    {
        if (!gc_enabled())
        {
            if (!empty($this->data['items']))
            {
                foreach ($this->data['items'] as $item)
                {
                    $item->__destruct();
                }
                unset($item, $this->data['items']);
            }
            if (!empty($this->data['ordered_items']))
            {
                foreach ($this->data['ordered_items'] as $item)
                {
                    $item->__destruct();
                }
                unset($item, $this->data['ordered_items']);
            }
        }
    }

    /**
     * Force the given data/URL to be treated as a feed
     *
     * This tells SimplePie to ignore the content-type provided by the server.
     * Be careful when using this option, as it will also disable autodiscovery.
     *
     * @since 1.1
     * @param bool $enable Force the given data/URL to be treated as a feed
     */
    public function force_feed($enable = false)
    {
        $this->force_feed = (bool) $enable;
    }

    /**
     * Set the URL of the feed you want to parse
     *
     * This allows you to enter the URL of the feed you want to parse, or the
     * website you want to try to use auto-discovery on. This takes priority
     * over any set raw data.
     *
     * You can set multiple feeds to mash together by passing an array instead
     * of a string for the $url. Remember that with each additional feed comes
     * additional processing and resources.
     *
     * @since 1.0 Preview Release
     * @see set_raw_data()
     * @param string|array $url This is the URL (or array of URLs) that you want to parse.
     */
    public function set_feed_url($url)
    {
        $this->multifeed_url = array();
        if (is_array($url))
        {
            foreach ($url as $value)
            {
                $this->multifeed_url[] = $this->registry->call('Misc', 'fix_protocol', array($value, 1));
            }
        }
        else
        {
            $this->feed_url = $this->registry->call('Misc', 'fix_protocol', array($url, 1));
            $this->permanent_url = $this->feed_url;
        }
    }

    /**
     * Set an instance of {@see SimplePie_File} to use as a feed
     *
     * @param SimplePie_File &$file
     * @return bool True on success, false on failure
     */
    public function set_file(&$file)
    {
        if ($file instanceof SimplePie_File)
        {
            $this->feed_url = $file->url;
            $this->permanent_url = $this->feed_url;
            $this->file =& $file;
            return true;
        }
        return false;
    }

    /**
     * Set the raw XML data to parse
     *
     * Allows you to use a string of RSS/Atom data instead of a remote feed.
     *
     * If you have a feed available as a string in PHP, you can tell SimplePie
     * to parse that data string instead of a remote feed. Any set feed URL
     * takes precedence.
     *
     * @since 1.0 Beta 3
     * @param string $data RSS or Atom data as a string.
     * @see set_feed_url()
     */
    public function set_raw_data($data)
    {
        $this->raw_data = $data;
    }

    /**
     * Set the default timeout for fetching remote feeds
     *
     * This allows you to change the maximum time the feed's server to respond
     * and send the feed back.
     *
     * @since 1.0 Beta 3
     * @param int $timeout The maximum number of seconds to spend waiting to retrieve a feed.
     */
    public function set_timeout($timeout = 10)
    {
        $this->timeout = (int) $timeout;
    }

    /**
     * Set custom curl options
     *
     * This allows you to change default curl options
     *
     * @since 1.0 Beta 3
     * @param array $curl_options Curl options to add to default settings
     */
    public function set_curl_options(array $curl_options = array())
    {
        $this->curl_options = $curl_options;
    }

    /**
     * Force SimplePie to use fsockopen() instead of cURL
     *
     * @since 1.0 Beta 3
     * @param bool $enable Force fsockopen() to be used
     */
    public function force_fsockopen($enable = false)
    {
        $this->force_fsockopen = (bool) $enable;
    }

    /**
     * Enable/disable caching in SimplePie.
     *
     * This option allows you to disable caching all-together in SimplePie.
     * However, disabling the cache can lead to longer load times.
     *
     * @since 1.0 Preview Release
     * @param bool $enable Enable caching
     */
    public function enable_cache($enable = true)
    {
        $this->cache = (bool) $enable;
    }

    /**
     * SimplePie to continue to fall back to expired cache, if enabled, when
     * feed is unavailable.
     *
     * This tells SimplePie to ignore any file errors and fall back to cache
     * instead. This only works if caching is enabled and cached content
     * still exists.

     * @param bool $enable Force use of cache on fail.
     */
    public function force_cache_fallback($enable = false)
    {
        $this->force_cache_fallback= (bool) $enable;
    }

    /**
     * Set the length of time (in seconds) that the contents of a feed will be
     * cached
     *
     * @param int $seconds The feed content cache duration
     */
    public function set_cache_duration($seconds = 3600)
    {
        $this->cache_duration = (int) $seconds;
    }

    /**
     * Set the length of time (in seconds) that the autodiscovered feed URL will
     * be cached
     *
     * @param int $seconds The autodiscovered feed URL cache duration.
     */
    public function set_autodiscovery_cache_duration($seconds = 604800)
    {
        $this->autodiscovery_cache_duration = (int) $seconds;
    }

    /**
     * Set the file system location where the cached files should be stored
     *
     * @param string $location The file system location.
     */
    public function set_cache_location($location = './cache')
    {
        $this->cache_location = (string) $location;
    }

    /**
     * Return the filename (i.e. hash, without path and without extension) of the file to cache a given URL.
     * @param string $url The URL of the feed to be cached.
     * @return string A filename (i.e. hash, without path and without extension).
     */
    public function get_cache_filename($url)
    {
        // Append custom parameters to the URL to avoid cache pollution in case of multiple calls with different parameters.
        $url .= $this->force_feed ? '#force_feed' : '';
        $options = array();
        if ($this->timeout != 10)
        {
            $options[CURLOPT_TIMEOUT] = $this->timeout;
        }
        if ($this->useragent !== SIMPLEPIE_USERAGENT)
        {
            $options[CURLOPT_USERAGENT] = $this->useragent;
        }
        if (!empty($this->curl_options))
        {
            foreach ($this->curl_options as $k => $v)
            {
                $options[$k] = $v;
            }
        }
        if (!empty($options))
        {
            ksort($options);
            $url .= '#' . urlencode(var_export($options, true));
        }
        return call_user_func($this->cache_name_function, $url);
    }

    /**
     * Set whether feed items should be sorted into reverse chronological order
     *
     * @param bool $enable Sort as reverse chronological order.
     */
    public function enable_order_by_date($enable = true)
    {
        $this->order_by_date = (bool) $enable;
    }

    /**
     * Set the character encoding used to parse the feed
     *
     * This overrides the encoding reported by the feed, however it will fall
     * back to the normal encoding detection if the override fails
     *
     * @param string $encoding Character encoding
     */
    public function set_input_encoding($encoding = false)
    {
        if ($encoding)
        {
            $this->input_encoding = (string) $encoding;
        }
        else
        {
            $this->input_encoding = false;
        }
    }

    /**
     * Set how much feed autodiscovery to do
     *
     * @see SIMPLEPIE_LOCATOR_NONE
     * @see SIMPLEPIE_LOCATOR_AUTODISCOVERY
     * @see SIMPLEPIE_LOCATOR_LOCAL_EXTENSION
     * @see SIMPLEPIE_LOCATOR_LOCAL_BODY
     * @see SIMPLEPIE_LOCATOR_REMOTE_EXTENSION
     * @see SIMPLEPIE_LOCATOR_REMOTE_BODY
     * @see SIMPLEPIE_LOCATOR_ALL
     * @param int $level Feed Autodiscovery Level (level can be a combination of the above constants, see bitwise OR operator)
     */
    public function set_autodiscovery_level($level = SIMPLEPIE_LOCATOR_ALL)
    {
        $this->autodiscovery = (int) $level;
    }

    /**
     * Get the class registry
     *
     * Use this to override SimplePie's default classes
     * @see SimplePie_Registry
     * @return SimplePie_Registry
     */
    public function &get_registry()
    {
        return $this->registry;
    }

    /**#@+
     * Useful when you are overloading or extending SimplePie's default classes.
     *
     * @deprecated Use {@see get_registry()} instead
     * @link http://php.net/manual/en/language.oop5.basic.php#language.oop5.basic.extends PHP5 extends documentation
     * @param string $class Name of custom class
     * @return boolean True on success, false otherwise
     */
    /**
     * Set which class SimplePie uses for caching
     */
    public function set_cache_class($class = 'SimplePie_Cache')
    {
        return $this->registry->register('Cache', $class, true);
    }

    /**
     * Set which class SimplePie uses for auto-discovery
     */
    public function set_locator_class($class = 'SimplePie_Locator')
    {
        return $this->registry->register('Locator', $class, true);
    }

    /**
     * Set which class SimplePie uses for XML parsing
     */
    public function set_parser_class($class = 'SimplePie_Parser')
    {
        return $this->registry->register('Parser', $class, true);
    }

    /**
     * Set which class SimplePie uses for remote file fetching
     */
    public function set_file_class($class = 'SimplePie_File')
    {
        return $this->registry->register('File', $class, true);
    }

    /**
     * Set which class SimplePie uses for data sanitization
     */
    public function set_sanitize_class($class = 'SimplePie_Sanitize')
    {
        return $this->registry->register('Sanitize', $class, true);
    }

    /**
     * Set which class SimplePie uses for handling feed items
     */
    public function set_item_class($class = 'SimplePie_Item')
    {
        return $this->registry->register('Item', $class, true);
    }

    /**
     * Set which class SimplePie uses for handling author data
     */
    public function set_author_class($class = 'SimplePie_Author')
    {
        return $this->registry->register('Author', $class, true);
    }

    /**
     * Set which class SimplePie uses for handling category data
     */
    public function set_category_class($class = 'SimplePie_Category')
    {
        return $this->registry->register('Category', $class, true);
    }

    /**
     * Set which class SimplePie uses for feed enclosures
     */
    public function set_enclosure_class($class = 'SimplePie_Enclosure')
    {
        return $this->registry->register('Enclosure', $class, true);
    }

    /**
     * Set which class SimplePie uses for `<media:text>` captions
     */
    public function set_caption_class($class = 'SimplePie_Caption')
    {
        return $this->registry->register('Caption', $class, true);
    }

    /**
     * Set which class SimplePie uses for `<media:copyright>`
     */
    public function set_copyright_class($class = 'SimplePie_Copyright')
    {
        return $this->registry->register('Copyright', $class, true);
    }

    /**
     * Set which class SimplePie uses for `<media:credit>`
     */
    public function set_credit_class($class = 'SimplePie_Credit')
    {
        return $this->registry->register('Credit', $class, true);
    }

    /**
     * Set which class SimplePie uses for `<media:rating>`
     */
    public function set_rating_class($class = 'SimplePie_Rating')
    {
        return $this->registry->register('Rating', $class, true);
    }

    /**
     * Set which class SimplePie uses for `<media:restriction>`
     */
    public function set_restriction_class($class = 'SimplePie_Restriction')
    {
        return $this->registry->register('Restriction', $class, true);
    }

    /**
     * Set which class SimplePie uses for content-type sniffing
     */
    public function set_content_type_sniffer_class($class = 'SimplePie_Content_Type_Sniffer')
    {
        return $this->registry->register('Content_Type_Sniffer', $class, true);
    }

    /**
     * Set which class SimplePie uses item sources
     */
    public function set_source_class($class = 'SimplePie_Source')
    {
        return $this->registry->register('Source', $class, true);
    }
    /**#@-*/

    /**
     * Set the user agent string
     *
     * @param string $ua New user agent string.
     */
    public function set_useragent($ua = SIMPLEPIE_USERAGENT)
    {
        $this->useragent = (string) $ua;
    }

    /**
     * Set callback function to create cache filename with
     *
     * @param mixed $function Callback function
     */
    public function set_cache_name_function($function = 'md5')
    {
        if (is_callable($function))
        {
            $this->cache_name_function = $function;
        }
    }

    /**
     * Set options to make SimplePie as fast as possible.
     *
     * Forgoes a substantial amount of data sanitization in favor of speed.
     * This turns SimplePie into a less clever parser of feeds.
     *
     * @param bool $set Whether to set them or not.
     */
    public function set_stupidly_fast($set = false)
    {
        if ($set)
        {
            $this->enable_order_by_date(false);
            $this->remove_div(false);
            $this->strip_comments(false);
            $this->strip_htmltags(false);
            $this->strip_attributes(false);
            $this->add_attributes(false);
            $this->set_image_handler(false);
            $this->set_https_domains(array());
        }
    }

    /**
     * Set maximum number of feeds to check with autodiscovery
     *
     * @param int $max Maximum number of feeds to check
     */
    public function set_max_checked_feeds($max = 10)
    {
        $this->max_checked_feeds = (int) $max;
    }

    public function remove_div($enable = true)
    {
        $this->sanitize->remove_div($enable);
    }

    public function strip_htmltags($tags = '', $encode = null)
    {
        if ($tags === '')
        {
            $tags = $this->strip_htmltags;
        }
        $this->sanitize->strip_htmltags($tags);
        if ($encode !== null)
        {
            $this->sanitize->encode_instead_of_strip($tags);
        }
    }

    public function encode_instead_of_strip($enable = true)
    {
        $this->sanitize->encode_instead_of_strip($enable);
    }

    public function strip_attributes($attribs = '')
    {
        if ($attribs === '')
        {
            $attribs = $this->strip_attributes;
        }
        $this->sanitize->strip_attributes($attribs);
    }

    public function add_attributes($attribs = '')
    {
        if ($attribs === '')
        {
            $attribs = $this->add_attributes;
        }
        $this->sanitize->add_attributes($attribs);
    }

    /**
     * Set the output encoding
     *
     * Allows you to override SimplePie's output to match that of your webpage.
     * 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 list of domains for which to force HTTPS.
     * @see SimplePie_Sanitize::set_https_domains()
     * @param array List of HTTPS domains. Example array('biz', 'example.com', 'example.org', 'www.example.net').
     */
    public function set_https_domains($domains = array())
    {
        if (is_array($domains))
        {
            $this->sanitize->set_https_domains($domains);
        }
    }

    /**
     * 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'] !== '')
            {
                $filename = $this->get_cache_filename($this->feed_url);
                $cache = $this->registry->call('Cache', 'get_handler', array($this->cache_location, $filename, '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;
        }

        // Empty response check
        if(empty($this->raw_data)){
            $this->error = "A feed could not be found at `$this->feed_url`. Empty body.";
            $this->registry->call('Misc', 'error', array($this->error, E_USER_NOTICE, __FILE__, __LINE__));
            return false;
        }

        // 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_Base|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();
                        }

                        $cache->unlink();
                        $this->data = array();
                    }
                }
                // Check if the cache has been updated
                elseif ($cache->mtime() + $this->cache_duration < 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']))
                    {
                        $headers = array(
                            'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
                        );
                        if (isset($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'];
                        }

                        $file = $this->registry->create('File', array($this->feed_url, $this->timeout/10, 5, $headers, $this->useragent, $this->force_fsockopen, $this->curl_options));
                        $this->status_code = $file->status_code;

                        if ($file->success)
                        {
                            if ($file->status_code === 304)
                            {
                                // Set raw_data to false here too, to signify that the cache
                                // is still valid.
                                $this->raw_data = false;
                                $cache->touch();
                                return true;
                            }
                        }
                        else
                        {
                            $this->check_modified = false;
                            if($this->force_cache_fallback)
                            {
                                $cache->touch();
                                return true;
                            }

                            unset($file);
                        }
                    }
                }
                // If the cache is still valid, just return true
                else
                {
                    $this->raw_data = false;
                    return true;
                }
            }
            // If the cache is empty, delete it
            else
            {
                $cache->unlink();
                $this->data = array();
            }
        }
        // If we don't already have the file (it'll only exist if we've opened it to check if the cache has been modified), open it.
        if (!isset($file))
        {
            if ($this->file instanceof SimplePie_File && $this->file->url === $this->feed_url)
            {
                $file =& $this->file;
            }
            else
            {
                $headers = array(
                    'Accept' => 'application/atom+xml, application/rss+xml, application/rdf+xml;q=0.9, application/xml;q=0.8, text/xml;q=0.8, text/html;q=0.7, unknown/unknown;q=0.1, application/unknown;q=0.1, */*;q=0.1',
                );
                $file = $this->registry->create('File', array($this->feed_url, $this->timeout, 5, $headers, $this->useragent, $this->force_fsockopen, $this->curl_options));
            }
        }
        $this->status_code = $file->status_code;

        // If the file connection has an error, set SimplePie::error to that and quit
        if (!$file->success && !($file->method & SIMPLEPIE_FILE_SOURCE_REMOTE === 0 || ($file->status_code === 200 || $file->status_code > 206 && $file->status_code < 300)))
        {
            $this->error = $file->error;
            return !empty($this->data);
        }

        if (!$this->force_feed)
        {
            // Check if the supplied URL is a feed, if it isn't, look for it.
            $locate = $this->registry->create('Locator', array(&$file, $this->timeout, $this->useragent, $this->max_checked_feeds, $this->force_fsockopen, $this->curl_options));

            if (!$locate->is_feed($file))
            {
                $copyStatusCode = $file->status_code;
                $copyContentType = $file->headers['content-type'];
                try
                {
                    $microformats = false;
                    if (class_exists('DOMXpath') && function_exists('Mf2\parse')) {
                        $doc = new DOMDocument();
                        @$doc->loadHTML($file->body);
                        $xpath = new DOMXpath($doc);
                        // Check for both h-feed and h-entry, as both a feed with no entries
                        // and a list of entries without an h-feed wrapper are both valid.
                        $query = '//*[contains(concat(" ", @class, " "), " h-feed ") or '.
                            'contains(concat(" ", @class, " "), " h-entry ")]';
                        $result = $xpath->query($query);
                        $microformats = $result->length !== 0;
                    }
                    // Now also do feed discovery, but if microformats were found don't
                    // overwrite the current value of file.
                    $discovered = $locate->find($this->autodiscovery,
                                                $this->all_discovered_feeds);
                    if ($microformats)
                    {
                        if ($hub = $locate->get_rel_link('hub'))
                        {
                            $self = $locate->get_rel_link('self');
                            $this->store_links($file, $hub, $self);
                        }
                        // Push the current file onto all_discovered feeds so the user can
                        // be shown this as one of the options.
                        if (isset($this->all_discovered_feeds)) {
                            $this->all_discovered_feeds[] = $file;
                        }
                    }
                    else
                    {
                        if ($discovered)
                        {
                            $file = $discovered;
                        }
                        else
                        {
                            // We need to unset this so that if SimplePie::set_file() has
                            // been called that object is untouched
                            unset($file);
                            $this->error = "A feed could not be found at `$this->feed_url`; the status code is `$copyStatusCode` and content-type is `$copyContentType`";
                            $this->registry->call('Misc', 'error', array($this->error, E_USER_NOTICE, __FILE__, __LINE__));
                            return false;
                        }
                    }
                }
                catch (SimplePie_Exception $e)
                {
                    // We need to unset this so that if SimplePie::set_file() has been called that object is untouched
                    unset($file);
                    // This is usually because DOMDocument doesn't exist
                    $this->error = $e->getMessage();
                    $this->registry->call('Misc', 'error', array($this->error, E_USER_NOTICE, $e->getFile(), $e->getLine()));
                    return false;
                }
                if ($cache)
                {
                    $this->data = array('url' => $this->feed_url, 'feed_url' => $file->url, 'build' => SIMPLEPIE_BUILD);
                    if (!$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);
                    }
                    $cache = $this->registry->call('Cache', 'get_handler', array($this->cache_location, call_user_func($this->cache_name_function, $file->url), 'spc'));
                }
            }
            $this->feed_url = $file->url;
            $locate = null;
        }

        $this->raw_data = $file->body;
        $this->permanent_url = $file->permanent_url;
        $headers = $file->headers;
        $sniffer = $this->registry->create('Content_Type_Sniffer', array(&$file));
        $sniffed = $sniffer->get_type();

        return array($headers, $sniffed);
    }

    /**
     * Get the error message for the occurred error
     *
     * @return string|array Error message, or array of messages for multifeeds
     */
    public function error()
    {
        return $this->error;
    }

    /**
     * Get the last HTTP status code
     *
     * @return int Status code
     */
    public function status_code()
    {
        return $this->status_code;
    }

    /**
     * Get the raw XML
     *
     * This is the same as the old `$feed->enable_xml_dump(true)`, but returns
     * the data instead of printing it.
     *
     * @return string|boolean Raw XML data, false if the cache is used
     */
    public function get_raw_data()
    {
        return $this->raw_data;
    }

    /**
     * Get the character encoding used for output
     *
     * @since Preview Release
     * @return string
     */
    public function get_encoding()
    {
        return $this->sanitize->output_encoding;
    }

    /**
     * Send the Content-Type header with correct encoding
     *
     * This method ensures that the SimplePie-enabled page is being served with
     * the correct {@link http://www.iana.org/assignments/media-types/ mime-type}
     * and character encoding HTTP headers (character encoding determined by the
     * {@see set_output_encoding} config option).
     *
     * This won't work properly if any content or whitespace has already been
     * sent to the browser, because it relies on PHP's
     * {@link http://php.net/header header()} function, and these are the
     * circumstances under which the function works.
     *
     * Because it's setting these settings for the entire page (as is the nature
     * of HTTP headers), this should only be used once per page (again, at the
     * top).
     *
     * @param string $mime MIME type to serve the page as
     */
    public function handle_content_type($mime = 'text/html')
    {
        if (!headers_sent())
        {
            $header = "Content-Type: $mime;";
            if ($this->get_encoding())
            {
                $header .= ' charset=' . $this->get_encoding();
            }
            else
            {
                $header .= ' charset=UTF-8';
            }
            header($header);
        }
    }

    /**
     * Get the type of the feed
     *
     * This returns a SIMPLEPIE_TYPE_* constant, which can be tested against
     * using {@link http://php.net/language.operators.bitwise bitwise operators}
     *
     * @since 0.8 (usage changed to using constants in 1.0)
     * @see SIMPLEPIE_TYPE_NONE Unknown.
     * @see SIMPLEPIE_TYPE_RSS_090 RSS 0.90.
     * @see SIMPLEPIE_TYPE_RSS_091_NETSCAPE RSS 0.91 (Netscape).
     * @see SIMPLEPIE_TYPE_RSS_091_USERLAND RSS 0.91 (Userland).
     * @see SIMPLEPIE_TYPE_RSS_091 RSS 0.91.
     * @see SIMPLEPIE_TYPE_RSS_092 RSS 0.92.
     * @see SIMPLEPIE_TYPE_RSS_093 RSS 0.93.
     * @see SIMPLEPIE_TYPE_RSS_094 RSS 0.94.
     * @see SIMPLEPIE_TYPE_RSS_10 RSS 1.0.
     * @see SIMPLEPIE_TYPE_RSS_20 RSS 2.0.x.
     * @see SIMPLEPIE_TYPE_RSS_RDF RDF-based RSS.
     * @see SIMPLEPIE_TYPE_RSS_SYNDICATION Non-RDF-based RSS (truly intended as syndication format).
     * @see SIMPLEPIE_TYPE_RSS_ALL Any version of RSS.
     * @see SIMPLEPIE_TYPE_ATOM_03 Atom 0.3.
     * @see SIMPLEPIE_TYPE_ATOM_10 Atom 1.0.
     * @see SIMPLEPIE_TYPE_ATOM_ALL Any version of Atom.
     * @see SIMPLEPIE_TYPE_ALL Any known/supported feed type.
     * @return int SIMPLEPIE_TYPE_* constant
     */
    public function get_type()
    {
        if (!isset($this->data['type']))
        {
            $this->data['type'] = SIMPLEPIE_TYPE_ALL;
            if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed']))
            {
                $this->data['type'] &= SIMPLEPIE_TYPE_ATOM_10;
            }
            elseif (isset($this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed']))
            {
                $this->data['type'] &= SIMPLEPIE_TYPE_ATOM_03;
            }
            elseif (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF']))
            {
                if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_10]['channel'])
                || isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_10]['image'])
                || isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_10]['item'])
                || isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_10]['textinput']))
                {
                    $this->data['type'] &= SIMPLEPIE_TYPE_RSS_10;
                }
                if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_090]['channel'])
                || isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_090]['image'])
                || isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_090]['item'])
                || isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_090]['textinput']))
                {
                    $this->data['type'] &= SIMPLEPIE_TYPE_RSS_090;
                }
            }
            elseif (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss']))
            {
                $this->data['type'] &= SIMPLEPIE_TYPE_RSS_ALL;
                if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['attribs']['']['version']))
                {
                    switch (trim($this->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['attribs']['']['version']))
                    {
                        case '0.91':
                            $this->data['type'] &= SIMPLEPIE_TYPE_RSS_091;
                            if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_20]['skiphours']['hour'][0]['data']))
                            {
                                switch (trim($this->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_20]['skiphours']['hour'][0]['data']))
                                {
                                    case '0':
                                        $this->data['type'] &= SIMPLEPIE_TYPE_RSS_091_NETSCAPE;
                                        break;

                                    case '24':
                                        $this->data['type'] &= SIMPLEPIE_TYPE_RSS_091_USERLAND;
                                        break;
                                }
                            }
                            break;

                        case '0.92':
                            $this->data['type'] &= SIMPLEPIE_TYPE_RSS_092;
                            break;

                        case '0.93':
                            $this->data['type'] &= SIMPLEPIE_TYPE_RSS_093;
                            break;

                        case '0.94':
                            $this->data['type'] &= SIMPLEPIE_TYPE_RSS_094;
                            break;

                        case '2.0':
                            $this->data['type'] &= SIMPLEPIE_TYPE_RSS_20;
                            break;
                    }
                }
            }
            else
            {
                $this->data['type'] = SIMPLEPIE_TYPE_NONE;
            }
        }
        return $this->data['type'];
    }

    /**
     * Get the URL for the feed
     *
     * When the 'permanent' mode is enabled, returns the original feed URL,
     * except in the case of an `HTTP 301 Moved Permanently` status response,
     * in which case the location of the first redirection is returned.
     *
     * When the 'permanent' mode is disabled (default),
     * may or may not be different from the URL passed to {@see set_feed_url()},
     * depending on whether auto-discovery was used, and whether there were
     * any redirects along the way.
     *
     * @since Preview Release (previously called `get_feed_url()` since SimplePie 0.8.)
     * @todo Support <itunes:new-feed-url>
     * @todo Also, |atom:link|@rel=self
     * @param bool $permanent Permanent mode to return only the original URL or the first redirection
     * iff it is a 301 redirection
     * @return string|null
     */
    public function subscribe_url($permanent = false)
    {
        if ($permanent)
        {
            if ($this->permanent_url !== null)
            {
                // sanitize encodes ampersands which are required when used in a url.
                return str_replace('&amp;', '&',
                                   $this->sanitize($this->permanent_url,
                                                   SIMPLEPIE_CONSTRUCT_IRI));
            }
        }
        else
        {
            if ($this->feed_url !== null)
            {
                return str_replace('&amp;', '&',
                                   $this->sanitize($this->feed_url,
                                                   SIMPLEPIE_CONSTRUCT_IRI));
            }
        }
        return null;
    }

    /**
     * Get data for an feed-level element
     *
     * This method allows you to get access to ANY element/attribute that is a
     * sub-element of the opening feed tag.
     *
     * The return value is an indexed array of elements matching the given
     * namespace and tag name. Each element has `attribs`, `data` and `child`
     * subkeys. For `attribs` and `child`, these contain namespace subkeys.
     * `attribs` then has one level of associative name => value data (where
     * `value` is a string) after the namespace. `child` has tag-indexed keys
     * after the namespace, each member of which is an indexed array matching
     * this same format.
     *
     * For example:
     * <pre>
     * // This is probably a bad example because we already support
     * // <media:content> natively, but it shows you how to parse through
     * // the nodes.
     * $group = $item->get_item_tags(SIMPLEPIE_NAMESPACE_MEDIARSS, 'group');
     * $content = $group[0]['child'][SIMPLEPIE_NAMESPACE_MEDIARSS]['content'];
     * $file = $content[0]['attribs']['']['url'];
     * echo $file;
     * </pre>
     *
     * @since 1.0
     * @see http://simplepie.org/wiki/faq/supported_xml_namespaces
     * @param string $namespace The URL of the XML namespace of the elements you're trying to access
     * @param string $tag Tag name
     * @return array
     */
    public function get_feed_tags($namespace, $tag)
    {
        $type = $this->get_type();
        if ($type & SIMPLEPIE_TYPE_ATOM_10)
        {
            if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0]['child'][$namespace][$tag]))
            {
                return $this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0]['child'][$namespace][$tag];
            }
        }
        if ($type & SIMPLEPIE_TYPE_ATOM_03)
        {
            if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0]['child'][$namespace][$tag]))
            {
                return $this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0]['child'][$namespace][$tag];
            }
        }
        if ($type & SIMPLEPIE_TYPE_RSS_RDF)
        {
            if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][$namespace][$tag]))
            {
                return $this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['child'][$namespace][$tag];
            }
        }
        if ($type & SIMPLEPIE_TYPE_RSS_SYNDICATION)
        {
            if (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][$namespace][$tag]))
            {
                return $this->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][$namespace][$tag];
            }
        }
        return null;
    }

    /**
     * Get data for an channel-level element
     *
     * This method allows you to get access to ANY element/attribute in the
     * channel/header section of the feed.
     *
     * See {@see SimplePie::get_feed_tags()} for a description of the return value
     *
     * @since 1.0
     * @see http://simplepie.org/wiki/faq/supported_xml_namespaces
     * @param string $namespace The URL of the XML namespace of the elements you're trying to access
     * @param string $tag Tag name
     * @return array
     */
    public function get_channel_tags($namespace, $tag)
    {
        $type = $this->get_type();
        if ($type & SIMPLEPIE_TYPE_ATOM_ALL)
        {
            if ($return = $this->get_feed_tags($namespace, $tag))
            {
                return $return;
            }
        }
        if ($type & SIMPLEPIE_TYPE_RSS_10)
        {
            if ($channel = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'channel'))
            {
                if (isset($channel[0]['child'][$namespace][$tag]))
                {
                    return $channel[0]['child'][$namespace][$tag];
                }
            }
        }
        if ($type & SIMPLEPIE_TYPE_RSS_090)
        {
            if ($channel = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'channel'))
            {
                if (isset($channel[0]['child'][$namespace][$tag]))
                {
                    return $channel[0]['child'][$namespace][$tag];
                }
            }
        }
        if ($type & SIMPLEPIE_TYPE_RSS_SYNDICATION)
        {
            if ($channel = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'channel'))
            {
                if (isset($channel[0]['child'][$namespace][$tag]))
                {
                    return $channel[0]['child'][$namespace][$tag];
                }
            }
        }
        return null;
    }

    /**
     * Get data for an channel-level element
     *
     * This method allows you to get access to ANY element/attribute in the
     * image/logo section of the feed.
     *
     * See {@see SimplePie::get_feed_tags()} for a description of the return value
     *
     * @since 1.0
     * @see http://simplepie.org/wiki/faq/supported_xml_namespaces
     * @param string $namespace The URL of the XML namespace of the elements you're trying to access
     * @param string $tag Tag name
     * @return array
     */
    public function get_image_tags($namespace, $tag)
    {
        $type = $this->get_type();
        if ($type & SIMPLEPIE_TYPE_RSS_10)
        {
            if ($image = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'image'))
            {
                if (isset($image[0]['child'][$namespace][$tag]))
                {
                    return $image[0]['child'][$namespace][$tag];
                }
            }
        }
        if ($type & SIMPLEPIE_TYPE_RSS_090)
        {
            if ($image = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'image'))
            {
                if (isset($image[0]['child'][$namespace][$tag]))
                {
                    return $image[0]['child'][$namespace][$tag];
                }
            }
        }
        if ($type & SIMPLEPIE_TYPE_RSS_SYNDICATION)
        {
            if ($image = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'image'))
            {
                if (isset($image[0]['child'][$namespace][$tag]))
                {
                    return $image[0]['child'][$namespace][$tag];
                }
            }
        }
        return null;
    }

    /**
     * Get the base URL value from the feed
     *
     * Uses `<xml:base>` if available, otherwise uses the first link in the
     * feed, or failing that, the URL of the feed itself.
     *
     * @see get_link
     * @see subscribe_url
     *
     * @param array $element
     * @return string
     */
    public function get_base($element = array())
    {
        if (!($this->get_type() & SIMPLEPIE_TYPE_RSS_SYNDICATION) && !empty($element['xml_base_explicit']) && isset($element['xml_base']))
        {
            return $element['xml_base'];
        }
        elseif ($this->get_link() !== null)
        {
            return $this->get_link();
        }

        return $this->subscribe_url();
    }

    /**
     * Sanitize feed data
     *
     * @access private
     * @see SimplePie_Sanitize::sanitize()
     * @param string $data Data to sanitize
     * @param int $type One of the SIMPLEPIE_CONSTRUCT_* constants
     * @param string $base Base URL to resolve URLs against
     * @return string Sanitized data
     */
    public function sanitize($data, $type, $base = '')
    {
        try
        {
            return $this->sanitize->sanitize($data, $type, $base);
        }
        catch (SimplePie_Exception $e)
        {
            if (!$this->enable_exceptions)
            {
                $this->error = $e->getMessage();
                $this->registry->call('Misc', 'error', array($this->error, E_USER_WARNING, $e->getFile(), $e->getLine()));
                return '';
            }

            throw $e;
        }
    }

    /**
     * Get the title of the feed
     *
     * Uses `<atom:title>`, `<title>` or `<dc:title>`
     *
     * @since 1.0 (previously called `get_feed_title` since 0.8)
     * @return string|null
     */
    public function get_title()
    {
        if ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'title'))
        {
            return $this->sanitize($return[0]['data'], $this->registry->call('Misc', 'atom_10_construct_type', array($return[0]['attribs'])), $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_03, 'title'))
        {
            return $this->sanitize($return[0]['data'], $this->registry->call('Misc', 'atom_03_construct_type', array($return[0]['attribs'])), $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_11, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_10, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }

        return null;
    }

    /**
     * Get a category for the feed
     *
     * @since Unknown
     * @param int $key The category that you want to return. Remember that arrays begin with 0, not 1
     * @return SimplePie_Category|null
     */
    public function get_category($key = 0)
    {
        $categories = $this->get_categories();
        if (isset($categories[$key]))
        {
            return $categories[$key];
        }

        return null;
    }

    /**
     * Get all categories for the feed
     *
     * Uses `<atom:category>`, `<category>` or `<dc:subject>`
     *
     * @since Unknown
     * @return array|null List of {@see SimplePie_Category} objects
     */
    public function get_categories()
    {
        $categories = array();

        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'category') as $category)
        {
            $term = null;
            $scheme = null;
            $label = null;
            if (isset($category['attribs']['']['term']))
            {
                $term = $this->sanitize($category['attribs']['']['term'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if (isset($category['attribs']['']['scheme']))
            {
                $scheme = $this->sanitize($category['attribs']['']['scheme'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if (isset($category['attribs']['']['label']))
            {
                $label = $this->sanitize($category['attribs']['']['label'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            $categories[] = $this->registry->create('Category', array($term, $scheme, $label));
        }
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'category') as $category)
        {
            // This is really the label, but keep this as the term also for BC.
            // Label will also work on retrieving because that falls back to term.
            $term = $this->sanitize($category['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            if (isset($category['attribs']['']['domain']))
            {
                $scheme = $this->sanitize($category['attribs']['']['domain'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            else
            {
                $scheme = null;
            }
            $categories[] = $this->registry->create('Category', array($term, $scheme, null));
        }
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_11, 'subject') as $category)
        {
            $categories[] = $this->registry->create('Category', array($this->sanitize($category['data'], SIMPLEPIE_CONSTRUCT_TEXT), null, null));
        }
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_10, 'subject') as $category)
        {
            $categories[] = $this->registry->create('Category', array($this->sanitize($category['data'], SIMPLEPIE_CONSTRUCT_TEXT), null, null));
        }

        if (!empty($categories))
        {
            return array_unique($categories);
        }

        return null;
    }

    /**
     * Get an author for the feed
     *
     * @since 1.1
     * @param int $key The author that you want to return. Remember that arrays begin with 0, not 1
     * @return SimplePie_Author|null
     */
    public function get_author($key = 0)
    {
        $authors = $this->get_authors();
        if (isset($authors[$key]))
        {
            return $authors[$key];
        }

        return null;
    }

    /**
     * Get all authors for the feed
     *
     * Uses `<atom:author>`, `<author>`, `<dc:creator>` or `<itunes:author>`
     *
     * @since 1.1
     * @return array|null List of {@see SimplePie_Author} objects
     */
    public function get_authors()
    {
        $authors = array();
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'author') as $author)
        {
            $name = null;
            $uri = null;
            $email = null;
            if (isset($author['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['name'][0]['data']))
            {
                $name = $this->sanitize($author['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['name'][0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if (isset($author['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]['data']))
            {
                $uri = $this->sanitize($author['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($author['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]));
            }
            if (isset($author['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['email'][0]['data']))
            {
                $email = $this->sanitize($author['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['email'][0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if ($name !== null || $email !== null || $uri !== null)
            {
                $authors[] = $this->registry->create('Author', array($name, $uri, $email));
            }
        }
        if ($author = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_03, 'author'))
        {
            $name = null;
            $url = null;
            $email = null;
            if (isset($author[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['name'][0]['data']))
            {
                $name = $this->sanitize($author[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['name'][0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if (isset($author[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['url'][0]['data']))
            {
                $url = $this->sanitize($author[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['url'][0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($author[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['url'][0]));
            }
            if (isset($author[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['email'][0]['data']))
            {
                $email = $this->sanitize($author[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['email'][0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if ($name !== null || $email !== null || $url !== null)
            {
                $authors[] = $this->registry->create('Author', array($name, $url, $email));
            }
        }
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_11, 'creator') as $author)
        {
            $authors[] = $this->registry->create('Author', array($this->sanitize($author['data'], SIMPLEPIE_CONSTRUCT_TEXT), null, null));
        }
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_10, 'creator') as $author)
        {
            $authors[] = $this->registry->create('Author', array($this->sanitize($author['data'], SIMPLEPIE_CONSTRUCT_TEXT), null, null));
        }
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ITUNES, 'author') as $author)
        {
            $authors[] = $this->registry->create('Author', array($this->sanitize($author['data'], SIMPLEPIE_CONSTRUCT_TEXT), null, null));
        }

        if (!empty($authors))
        {
            return array_unique($authors);
        }

        return null;
    }

    /**
     * Get a contributor for the feed
     *
     * @since 1.1
     * @param int $key The contrbutor that you want to return. Remember that arrays begin with 0, not 1
     * @return SimplePie_Author|null
     */
    public function get_contributor($key = 0)
    {
        $contributors = $this->get_contributors();
        if (isset($contributors[$key]))
        {
            return $contributors[$key];
        }

        return null;
    }

    /**
     * Get all contributors for the feed
     *
     * Uses `<atom:contributor>`
     *
     * @since 1.1
     * @return array|null List of {@see SimplePie_Author} objects
     */
    public function get_contributors()
    {
        $contributors = array();
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'contributor') as $contributor)
        {
            $name = null;
            $uri = null;
            $email = null;
            if (isset($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['name'][0]['data']))
            {
                $name = $this->sanitize($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['name'][0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if (isset($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]['data']))
            {
                $uri = $this->sanitize($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]));
            }
            if (isset($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['email'][0]['data']))
            {
                $email = $this->sanitize($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['email'][0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if ($name !== null || $email !== null || $uri !== null)
            {
                $contributors[] = $this->registry->create('Author', array($name, $uri, $email));
            }
        }
        foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_03, 'contributor') as $contributor)
        {
            $name = null;
            $url = null;
            $email = null;
            if (isset($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['name'][0]['data']))
            {
                $name = $this->sanitize($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['name'][0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if (isset($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['url'][0]['data']))
            {
                $url = $this->sanitize($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['url'][0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['url'][0]));
            }
            if (isset($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['email'][0]['data']))
            {
                $email = $this->sanitize($contributor['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['email'][0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
            }
            if ($name !== null || $email !== null || $url !== null)
            {
                $contributors[] = $this->registry->create('Author', array($name, $url, $email));
            }
        }

        if (!empty($contributors))
        {
            return array_unique($contributors);
        }

        return null;
    }

    /**
     * Get a single link for the feed
     *
     * @since 1.0 (previously called `get_feed_link` since Preview Release, `get_feed_permalink()` since 0.8)
     * @param int $key The link that you want to return. Remember that arrays begin with 0, not 1
     * @param string $rel The relationship of the link to return
     * @return string|null Link URL
     */
    public function get_link($key = 0, $rel = 'alternate')
    {
        $links = $this->get_links($rel);
        if (isset($links[$key]))
        {
            return $links[$key];
        }

        return null;
    }

    /**
     * Get the permalink for the item
     *
     * Returns the first link available with a relationship of "alternate".
     * Identical to {@see get_link()} with key 0
     *
     * @see get_link
     * @since 1.0 (previously called `get_feed_link` since Preview Release, `get_feed_permalink()` since 0.8)
     * @internal Added for parity between the parent-level and the item/entry-level.
     * @return string|null Link URL
     */
    public function get_permalink()
    {
        return $this->get_link(0);
    }

    /**
     * Get all links for the feed
     *
     * Uses `<atom:link>` or `<link>`
     *
     * @since Beta 2
     * @param string $rel The relationship of links to return
     * @return array|null Links found for the feed (strings)
     */
    public function get_links($rel = 'alternate')
    {
        if (!isset($this->data['links']))
        {
            $this->data['links'] = array();
            if ($links = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'link'))
            {
                foreach ($links as $link)
                {
                    if (isset($link['attribs']['']['href']))
                    {
                        $link_rel = (isset($link['attribs']['']['rel'])) ? $link['attribs']['']['rel'] : 'alternate';
                        $this->data['links'][$link_rel][] = $this->sanitize($link['attribs']['']['href'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($link));
                    }
                }
            }
            if ($links = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_03, 'link'))
            {
                foreach ($links as $link)
                {
                    if (isset($link['attribs']['']['href']))
                    {
                        $link_rel = (isset($link['attribs']['']['rel'])) ? $link['attribs']['']['rel'] : 'alternate';
                        $this->data['links'][$link_rel][] = $this->sanitize($link['attribs']['']['href'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($link));

                    }
                }
            }
            if ($links = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'link'))
            {
                $this->data['links']['alternate'][] = $this->sanitize($links[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($links[0]));
            }
            if ($links = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'link'))
            {
                $this->data['links']['alternate'][] = $this->sanitize($links[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($links[0]));
            }
            if ($links = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'link'))
            {
                $this->data['links']['alternate'][] = $this->sanitize($links[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($links[0]));
            }

            $keys = array_keys($this->data['links']);
            foreach ($keys as $key)
            {
                if ($this->registry->call('Misc', 'is_isegment_nz_nc', array($key)))
                {
                    if (isset($this->data['links'][SIMPLEPIE_IANA_LINK_RELATIONS_REGISTRY . $key]))
                    {
                        $this->data['links'][SIMPLEPIE_IANA_LINK_RELATIONS_REGISTRY . $key] = array_merge($this->data['links'][$key], $this->data['links'][SIMPLEPIE_IANA_LINK_RELATIONS_REGISTRY . $key]);
                        $this->data['links'][$key] =& $this->data['links'][SIMPLEPIE_IANA_LINK_RELATIONS_REGISTRY . $key];
                    }
                    else
                    {
                        $this->data['links'][SIMPLEPIE_IANA_LINK_RELATIONS_REGISTRY . $key] =& $this->data['links'][$key];
                    }
                }
                elseif (substr($key, 0, 41) === SIMPLEPIE_IANA_LINK_RELATIONS_REGISTRY)
                {
                    $this->data['links'][substr($key, 41)] =& $this->data['links'][$key];
                }
                $this->data['links'][$key] = array_unique($this->data['links'][$key]);
            }
        }

        if (isset($this->data['headers']['link']))
        {
            $link_headers = $this->data['headers']['link'];
            if (is_string($link_headers)) {
                $link_headers = array($link_headers);
            }
            $matches = preg_filter('/<([^>]+)>; rel='.preg_quote($rel).'/', '$1', $link_headers);
            if (!empty($matches)) {
                return $matches;
            }
        }

        if (isset($this->data['links'][$rel]))
        {
            return $this->data['links'][$rel];
        }

        return null;
    }

    public function get_all_discovered_feeds()
    {
        return $this->all_discovered_feeds;
    }

    /**
     * Get the content for the item
     *
     * Uses `<atom:subtitle>`, `<atom:tagline>`, `<description>`,
     * `<dc:description>`, `<itunes:summary>` or `<itunes:subtitle>`
     *
     * @since 1.0 (previously called `get_feed_description()` since 0.8)
     * @return string|null
     */
    public function get_description()
    {
        if ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'subtitle'))
        {
            return $this->sanitize($return[0]['data'], $this->registry->call('Misc', 'atom_10_construct_type', array($return[0]['attribs'])), $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_03, 'tagline'))
        {
            return $this->sanitize($return[0]['data'], $this->registry->call('Misc', 'atom_03_construct_type', array($return[0]['attribs'])), $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'description'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'description'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'description'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_HTML, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_11, 'description'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_10, 'description'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ITUNES, 'summary'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_HTML, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ITUNES, 'subtitle'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_HTML, $this->get_base($return[0]));
        }

        return null;
    }

    /**
     * Get the copyright info for the feed
     *
     * Uses `<atom:rights>`, `<atom:copyright>` or `<dc:rights>`
     *
     * @since 1.0 (previously called `get_feed_copyright()` since 0.8)
     * @return string|null
     */
    public function get_copyright()
    {
        if ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'rights'))
        {
            return $this->sanitize($return[0]['data'], $this->registry->call('Misc', 'atom_10_construct_type', array($return[0]['attribs'])), $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_03, 'copyright'))
        {
            return $this->sanitize($return[0]['data'], $this->registry->call('Misc', 'atom_03_construct_type', array($return[0]['attribs'])), $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'copyright'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_11, 'rights'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_10, 'rights'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }

        return null;
    }

    /**
     * Get the language for the feed
     *
     * Uses `<language>`, `<dc:language>`, or @xml_lang
     *
     * @since 1.0 (previously called `get_feed_language()` since 0.8)
     * @return string|null
     */
    public function get_language()
    {
        if ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'language'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_11, 'language'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_10, 'language'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif (isset($this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0]['xml_lang']))
        {
            return $this->sanitize($this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0]['xml_lang'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif (isset($this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0]['xml_lang']))
        {
            return $this->sanitize($this->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0]['xml_lang'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif (isset($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['xml_lang']))
        {
            return $this->sanitize($this->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]['xml_lang'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif (isset($this->data['headers']['content-language']))
        {
            return $this->sanitize($this->data['headers']['content-language'], SIMPLEPIE_CONSTRUCT_TEXT);
        }

        return null;
    }

    /**
     * Get the latitude coordinates for the item
     *
     * Compatible with the W3C WGS84 Basic Geo and GeoRSS specifications
     *
     * Uses `<geo:lat>` or `<georss:point>`
     *
     * @since 1.0
     * @link http://www.w3.org/2003/01/geo/ W3C WGS84 Basic Geo
     * @link http://www.georss.org/ GeoRSS
     * @return string|null
     */
    public function get_latitude()
    {

        if ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_W3C_BASIC_GEO, 'lat'))
        {
            return (float) $return[0]['data'];
        }
        elseif (($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_GEORSS, 'point')) && preg_match('/^((?:-)?[0-9]+(?:\.[0-9]+)) ((?:-)?[0-9]+(?:\.[0-9]+))$/', trim($return[0]['data']), $match))
        {
            return (float) $match[1];
        }

        return null;
    }

    /**
     * Get the longitude coordinates for the feed
     *
     * Compatible with the W3C WGS84 Basic Geo and GeoRSS specifications
     *
     * Uses `<geo:long>`, `<geo:lon>` or `<georss:point>`
     *
     * @since 1.0
     * @link http://www.w3.org/2003/01/geo/ W3C WGS84 Basic Geo
     * @link http://www.georss.org/ GeoRSS
     * @return string|null
     */
    public function get_longitude()
    {
        if ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_W3C_BASIC_GEO, 'long'))
        {
            return (float) $return[0]['data'];
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_W3C_BASIC_GEO, 'lon'))
        {
            return (float) $return[0]['data'];
        }
        elseif (($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_GEORSS, 'point')) && preg_match('/^((?:-)?[0-9]+(?:\.[0-9]+)) ((?:-)?[0-9]+(?:\.[0-9]+))$/', trim($return[0]['data']), $match))
        {
            return (float) $match[2];
        }

        return null;
    }

    /**
     * Get the feed logo's title
     *
     * RSS 0.9.0, 1.0 and 2.0 feeds are allowed to have a "feed logo" title.
     *
     * Uses `<image><title>` or `<image><dc:title>`
     *
     * @return string|null
     */
    public function get_image_title()
    {
        if ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_DC_11, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_DC_10, 'title'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_TEXT);
        }

        return null;
    }

    /**
     * Get the feed logo's URL
     *
     * RSS 0.9.0, 2.0, Atom 1.0, and feeds with iTunes RSS tags are allowed to
     * have a "feed logo" URL. This points directly to the image itself.
     *
     * Uses `<itunes:image>`, `<atom:logo>`, `<atom:icon>`,
     * `<image><title>` or `<image><dc:title>`
     *
     * @return string|null
     */
    public function get_image_url()
    {
        if ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ITUNES, 'image'))
        {
            return $this->sanitize($return[0]['attribs']['']['href'], SIMPLEPIE_CONSTRUCT_IRI);
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'logo'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'icon'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'url'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'url'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'url'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($return[0]));
        }

        return null;
    }


    /**
     * Get the feed logo's link
     *
     * RSS 0.9.0, 1.0 and 2.0 feeds are allowed to have a "feed logo" link. This
     * points to a human-readable page that the image should link to.
     *
     * Uses `<itunes:image>`, `<atom:logo>`, `<atom:icon>`,
     * `<image><title>` or `<image><dc:title>`
     *
     * @return string|null
     */
    public function get_image_link()
    {
        if ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'link'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'link'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($return[0]));
        }
        elseif ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'link'))
        {
            return $this->sanitize($return[0]['data'], SIMPLEPIE_CONSTRUCT_IRI, $this->get_base($return[0]));
        }

        return null;
    }

    /**
     * Get the feed logo's link
     *
     * RSS 2.0 feeds are allowed to have a "feed logo" width.
     *
     * Uses `<image><width>` or defaults to 88.0 if no width is specified and
     * the feed is an RSS 2.0 feed.
     *
     * @return int|float|null
     */
    public function get_image_width()
    {
        if ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'width'))
        {
            return round($return[0]['data']);
        }
        elseif ($this->get_type() & SIMPLEPIE_TYPE_RSS_SYNDICATION && $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'url'))
        {
            return 88.0;
        }

        return null;
    }

    /**
     * Get the feed logo's height
     *
     * RSS 2.0 feeds are allowed to have a "feed logo" height.
     *
     * Uses `<image><height>` or defaults to 31.0 if no height is specified and
     * the feed is an RSS 2.0 feed.
     *
     * @return int|float|null
     */
    public function get_image_height()
    {
        if ($return = $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'height'))
        {
            return round($return[0]['data']);
        }
        elseif ($this->get_type() & SIMPLEPIE_TYPE_RSS_SYNDICATION && $this->get_image_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'url'))
        {
            return 31.0;
        }

        return null;
    }

    /**
     * Get the number of items in the feed
     *
     * This is well-suited for {@link http://php.net/for for()} loops with
     * {@see get_item()}
     *
     * @param int $max Maximum value to return. 0 for no limit
     * @return int Number of items in the feed
     */
    public function get_item_quantity($max = 0)
    {
        $max = (int) $max;
        $qty = count($this->get_items());
        if ($max === 0)
        {
            return $qty;
        }

        return ($qty > $max) ? $max : $qty;
    }

    /**
     * Get a single item from the feed
     *
     * This is better suited for {@link http://php.net/for for()} loops, whereas
     * {@see get_items()} is better suited for
     * {@link http://php.net/foreach foreach()} loops.
     *
     * @see get_item_quantity()
     * @since Beta 2
     * @param int $key The item that you want to return. Remember that arrays begin with 0, not 1
     * @return SimplePie_Item|null
     */
    public function get_item($key = 0)
    {
        $items = $this->get_items();
        if (isset($items[$key]))
        {
            return $items[$key];
        }

        return null;
    }

    /**
     * Get all items from the feed
     *
     * This is better suited for {@link http://php.net/for for()} loops, whereas
     * {@see get_items()} is better suited for
     * {@link http://php.net/foreach foreach()} loops.
     *
     * @see get_item_quantity
     * @since Beta 2
     * @param int $start Index to start at
     * @param int $end Number of items to return. 0 for all items after `$start`
     * @return SimplePie_Item[]|null List of {@see SimplePie_Item} objects
     */
    public function get_items($start = 0, $end = 0)
    {
        if (!isset($this->data['items']))
        {
            if (!empty($this->multifeed_objects))
            {
                $this->data['items'] = SimplePie::merge_items($this->multifeed_objects, $start, $end, $this->item_limit);
                if (empty($this->data['items']))
                {
                    return array();
                }
                return $this->data['items'];
            }
            $this->data['items'] = array();
            if ($items = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'entry'))
            {
                $keys = array_keys($items);
                foreach ($keys as $key)
                {
                    $this->data['items'][] = $this->registry->create('Item', array($this, $items[$key]));
                }
            }
            if ($items = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_ATOM_03, 'entry'))
            {
                $keys = array_keys($items);
                foreach ($keys as $key)
                {
                    $this->data['items'][] = $this->registry->create('Item', array($this, $items[$key]));
                }
            }
            if ($items = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_RSS_10, 'item'))
            {
                $keys = array_keys($items);
                foreach ($keys as $key)
                {
                    $this->data['items'][] = $this->registry->create('Item', array($this, $items[$key]));
                }
            }
            if ($items = $this->get_feed_tags(SIMPLEPIE_NAMESPACE_RSS_090, 'item'))
            {
                $keys = array_keys($items);
                foreach ($keys as $key)
                {
                    $this->data['items'][] = $this->registry->create('Item', array($this, $items[$key]));
                }
            }
            if ($items = $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'item'))
            {
                $keys = array_keys($items);
                foreach ($keys as $key)
                {
                    $this->data['items'][] = $this->registry->create('Item', array($this, $items[$key]));
                }
            }
        }

        if (empty($this->data['items']))
        {
            return array();
        }

        if ($this->order_by_date)
        {
            if (!isset($this->data['ordered_items']))
            {
                $this->data['ordered_items'] = $this->data['items'];
                usort($this->data['ordered_items'], array(get_class($this), 'sort_items'));
             }
            $items = $this->data['ordered_items'];
        }
        else
        {
            $items = $this->data['items'];
        }
        // Slice the data as desired
        if ($end === 0)
        {
            return array_slice($items, $start);
        }

        return array_slice($items, $start, $end);
    }

    /**
     * Set the favicon handler
     *
     * @deprecated Use your own favicon handling instead
     */
    public function set_favicon_handler($page = false, $qs = 'i')
    {
        $level = defined('E_USER_DEPRECATED') ? E_USER_DEPRECATED : E_USER_WARNING;
        trigger_error('Favicon handling has been removed, please use your own handling', $level);
        return false;
    }

    /**
     * Get the favicon for the current feed
     *
     * @deprecated Use your own favicon handling instead
     */
    public function get_favicon()
    {
        $level = defined('E_USER_DEPRECATED') ? E_USER_DEPRECATED : E_USER_WARNING;
        trigger_error('Favicon handling has been removed, please use your own handling', $level);

        if (($url = $this->get_link()) !== null)
        {
            return 'https://www.google.com/s2/favicons?domain=' . urlencode($url);
        }

        return false;
    }

    /**
     * Magic method handler
     *
     * @param string $method Method name
     * @param array $args Arguments to the method
     * @return mixed
     */
    public function __call($method, $args)
    {
        if (strpos($method, 'subscribe_') === 0)
        {
            $level = defined('E_USER_DEPRECATED') ? E_USER_DEPRECATED : E_USER_WARNING;
            trigger_error('subscribe_*() has been deprecated, implement the callback yourself', $level);
            return '';
        }
        if ($method === 'enable_xml_dump')
        {
            $level = defined('E_USER_DEPRECATED') ? E_USER_DEPRECATED : E_USER_WARNING;
            trigger_error('enable_xml_dump() has been deprecated, use get_raw_data() instead', $level);
            return false;
        }

        $class = get_class($this);
        $trace = debug_backtrace(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection
        $file = $trace[0]['file'];
        $line = $trace[0]['line'];
        trigger_error("Call to undefined method $class::$method() in $file on line $line", E_USER_ERROR);
    }

    /**
     * Sorting callback for items
     *
     * @access private
     * @param SimplePie $a
     * @param SimplePie $b
     * @return boolean
     */
    public static function sort_items($a, $b)
    {
        $a_date = $a->get_date('U');
        $b_date = $b->get_date('U');
        if ($a_date && $b_date) {
            return $a_date > $b_date ? -1 : 1;
        }
        // Sort items without dates to the top.
        if ($a_date) {
            return 1;
        }
        if ($b_date) {
            return -1;
        }
        return 0;
    }

    /**
     * Merge items from several feeds into one
     *
     * If you're merging multiple feeds together, they need to all have dates
     * for the items or else SimplePie will refuse to sort them.
     *
     * @link http://simplepie.org/wiki/tutorial/sort_multiple_feeds_by_time_and_date#if_feeds_require_separate_per-feed_settings
     * @param array $urls List of SimplePie feed objects to merge
     * @param int $start Starting item
     * @param int $end Number of items to return
     * @param int $limit Maximum number of items per feed
     * @return array
     */
    public static function merge_items($urls, $start = 0, $end = 0, $limit = 0)
    {
        if (is_array($urls) && sizeof($urls) > 0)
        {
            $items = array();
            foreach ($urls as $arg)
            {
                if ($arg instanceof SimplePie)
                {
                    $items = array_merge($items, $arg->get_items(0, $limit));
                }
                else
                {
                    trigger_error('Arguments must be SimplePie objects', E_USER_WARNING);
                }
            }

            usort($items, array(get_class($urls[0]), 'sort_items'));

            if ($end === 0)
            {
                return array_slice($items, $start);
            }

            return array_slice($items, $start, $end);
        }

        trigger_error('Cannot merge zero SimplePie objects', E_USER_WARNING);
        return array();
    }

    /**
     * Store PubSubHubbub links as headers
     *
     * There is no way to find PuSH links in the body of a microformats feed,
     * so they are added to the headers when found, to be used later by get_links.
     * @param SimplePie_File $file
     * @param string $hub
     * @param string $self
     */
    private function store_links(&$file, $hub, $self) {
        if (isset($file->headers['link']['hub']) ||
              (isset($file->headers['link']) &&
               preg_match('/rel=hub/', $file->headers['link'])))
        {
            return;
        }

        if ($hub)
        {
            if (isset($file->headers['link']))
            {
                if ($file->headers['link'] !== '')
                {
                    $file->headers['link'] = ', ';
                }
            }
            else
            {
                $file->headers['link'] = '';
            }
            $file->headers['link'] .= '<'.$hub.'>; rel=hub';
            if ($self)
            {
                $file->headers['link'] .= ', <'.$self.'>; rel=self';
            }
        }
    }
}
endif;