public function test_unattached_link()
 {
     $attachment_id = self::factory()->attachment->create_object('image.jpg', 0, array('post_mime_type' => 'image/jpeg', 'post_type' => 'attachment'));
     $link = get_post_comments_feed_link($attachment_id);
     $expected = add_query_arg(array('feed' => get_default_feed(), 'attachment_id' => $attachment_id), home_url('/'));
     $this->assertEquals($expected, $link);
 }

/**
 * Clean up wp_head()
 *
 * Remove unnecessary <link>'s
 * Remove inline CSS and JS from WP emoji support
 * Remove inline CSS used by Recent Comments widget
 * Remove inline CSS used by posts with galleries
 * Remove self-closing tag and change ''s to "'s on rel_canonical()
 *
 * You can enable/disable this feature in functions.php (or lib/setup.php if you're using Sage):
 * add_theme_support('soil-clean-up');
 */
function head_cleanup()
{
    // Originally from http://wpengineer.com/1438/wordpress-header/
    remove_action('wp_head', 'feed_links_extra', 3);
    add_action('wp_head', 'ob_start', 1, 0);
    add_action('wp_head', function () {
        $pattern = '/.*' . preg_quote(esc_url(get_feed_link('comments_' . get_default_feed())), '/') . '.*[\\r\\n]+/';
        echo preg_replace($pattern, '', ob_get_clean());
    }, 3, 0);
    remove_action('wp_head', 'rsd_link');
    remove_action('wp_head', 'wlwmanifest_link');
    remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0);
    remove_action('wp_head', 'wp_generator');
    remove_action('wp_head', 'wp_shortlink_wp_head', 10, 0);
    remove_action('wp_head', 'print_emoji_detection_script', 7);
    remove_action('admin_print_scripts', 'print_emoji_detection_script');
    remove_action('wp_print_styles', 'print_emoji_styles');
    remove_action('admin_print_styles', 'print_emoji_styles');
    remove_action('wp_head', 'wp_oembed_add_discovery_links');
    remove_action('wp_head', 'wp_oembed_add_host_js');
    remove_action('wp_head', 'rest_output_link_wp_head', 10, 0);
    remove_filter('the_content_feed', 'wp_staticize_emoji');
    remove_filter('comment_text_rss', 'wp_staticize_emoji');
    remove_filter('wp_mail', 'wp_staticize_emoji_for_email');
    add_filter('use_default_gallery_style', '__return_false');
    global $wp_widget_factory;
    if (isset($wp_widget_factory->widgets['WP_Widget_Recent_Comments'])) {
        remove_action('wp_head', [$wp_widget_factory->widgets['WP_Widget_Recent_Comments'], 'recent_comments_style']);
    }
    if (!class_exists('WPSEO_Frontend')) {
        remove_action('wp_head', 'rel_canonical');
        add_action('wp_head', __NAMESPACE__ . '\\rel_canonical');
    }
}

 /**
  * Class constructor.
  *
  * @since 150218 Refactoring cache clear/purge routines.
  */
 public function __construct()
 {
     $this->plugin = plugin();
     $this->home_url = home_url('/');
     $this->default_feed = get_default_feed();
     $this->seo_friendly_permalinks = (bool) get_option('permalink_structure');
     $this->feed_types = array_unique(array($this->default_feed, 'rdf', 'rss', 'rss2', 'atom'));
 }

 /**
  * Class constructor.
  *
  * @since 150422 Rewrite.
  */
 public function __construct()
 {
     parent::__construct();
     $this->home_url = rtrim(home_url(), '/');
     $this->default_feed = get_default_feed();
     // Default feed type.
     $this->seo_friendly_permalinks = (bool) get_option('permalink_structure');
     $this->feed_types = array_unique([$this->default_feed, 'rdf', 'rss', 'rss2', 'atom']);
 }

function thesis_feed_url($display = false)
{
    global $thesis;
    $feed_url = $thesis['feed']['url'] ? $thesis['feed']['url'] : get_bloginfo(get_default_feed() . '_url');
    if ($display) {
        echo $feed_url;
    } else {
        return $feed_url;
    }
}

function thesis_feed_url($display = false)
{
    global $thesis_site;
    $feed_url = $thesis_site->head['feed']['url'] ? $thesis_site->head['feed']['url'] : get_bloginfo(get_default_feed() . '_url');
    $feed_url = apply_filters('thesis_feed_url', $feed_url);
    if ($display) {
        echo $feed_url;
    } else {
        return $feed_url;
    }
}

function smittenkitchen_content_feed($feed_type = null)
{
    if (!$feed_type) {
        $feed_type = get_default_feed();
    }
    global $more;
    $more_restore = $more;
    $more = 0;
    $content = apply_filters('the_content', get_the_content());
    $more = $more_restore;
    $content = str_replace(']]>', ']]& gt;', $content);
    return $content;
}

 /**
  * Page cache tab
  *
  * @return void
  */
 function view()
 {
     global $wp_rewrite;
     $feeds = $wp_rewrite->feeds;
     $feed_key = array_search('feed', $feeds);
     if ($feed_key !== false) {
         unset($feeds[$feed_key]);
     }
     $default_feed = get_default_feed();
     $pgcache_enabled = $this->_config->get_boolean('pgcache.enabled');
     $permalink_structure = get_option('permalink_structure');
     $varnish_enabled = $this->_config->get_boolean('varnish.enabled');
     $cdn_mirror_purge_enabled = Cdn_Util::is_engine_fsd($this->_config->get_string('cdn.engine')) && $this->_config->get_boolean('cdn.enabled');
     include W3TC_INC_DIR . '/options/pgcache.php';
 }

 /**
  * Page cache tab
  *
  * @return void
  */
 function view()
 {
     global $wp_rewrite;
     $feeds = $wp_rewrite->feeds;
     $feed_key = array_search('feed', $feeds);
     if ($feed_key !== false) {
         unset($feeds[$feed_key]);
     }
     $default_feed = get_default_feed();
     $pgcache_enabled = $this->_config->get_boolean('pgcache.enabled');
     $permalink_structure = get_option('permalink_structure');
     $varnish_enabled = $this->_config->get_boolean('varnish.enabled');
     $cdn_mirror_purge_enabled = w3_is_cdn_mirror($this->_config->get_string('cdn.engine')) && $this->_config->get_string('cdn.engine') != 'mirror' && $this->_config->get_boolean('cdncache.enabled') && w3tc_edge_mode() && w3_is_pro($this->_config) || w3_is_enterprise();
     $disable_check_domain = w3_is_multisite() && w3_force_master();
     include W3TC_INC_DIR . '/options/pgcache.php';
 }

/**
 * Display the links to the general feeds.
 *
 * @since 2.8.0
 *
 * @param array $args Optional arguments.
 */
function feed_links($args = array())
{
    if (!current_theme_supports('automatic-feed-links')) {
        return;
    }
    $defaults = array('separator' => _x('»', 'feed link'), 'feedtitle' => __('%1$s %2$s Feed'), 'comstitle' => __('%1$s %2$s Comments Feed'));
    $args = wp_parse_args($args, $defaults);
    echo '<link rel="alternate" type="' . feed_content_type() . '" title="' . esc_attr(sprintf($args['feedtitle'], get_bloginfo('name'), $args['separator'])) . '" href="' . esc_url(get_feed_link()) . "\" />\n";
    echo '<link rel="alternate" type="' . feed_content_type() . '" title="' . esc_attr(sprintf($args['comstitle'], get_bloginfo('name'), $args['separator'])) . '" href="' . esc_url(get_feed_link('comments_' . get_default_feed())) . "\" />\n";
}

/**
 * Load the feed template from the use of an action hook.
 *
 * If the feed action does not have a hook, then the function will die with a
 * message telling the visitor that the feed is not valid.
 *
 * It is better to only have one hook for each feed.
 *
 * @since 2.1.0
 *
 * @global WP_Query $wp_query Used to tell if the use a comment feed.
 */
function do_feed()
{
    global $wp_query;
    // Determine if we are looking at the main comment feed
    $is_main_comments_feed = $wp_query->is_comment_feed() && !$wp_query->is_singular();
    /*
     * Check the queried object for the existence of posts if it is not a feed for an archive,
     * search result, or main comments. By checking for the absense of posts we can prevent rendering the feed
     * templates at invalid endpoints. e.g.) /wp-content/plugins/feed/
     */
    if (!$wp_query->have_posts() && !($wp_query->is_archive() || $wp_query->is_search() || $is_main_comments_feed)) {
        wp_die(__('ERROR: This is not a valid feed.'), '', array('response' => 404));
    }
    $feed = get_query_var('feed');
    // Remove the pad, if present.
    $feed = preg_replace('/^_+/', '', $feed);
    if ($feed == '' || $feed == 'feed') {
        $feed = get_default_feed();
    }
    if (!has_action("do_feed_{$feed}")) {
        wp_die(__('ERROR: This is not a valid feed template.'), '', array('response' => 404));
    }
    /**
     * Fires once the given feed is loaded.
     *
     * The dynamic portion of the hook name, `$feed`, refers to the feed template name.
     * Possible values include: 'rdf', 'rss', 'rss2', and 'atom'.
     *
     * @since 2.1.0
     * @since 4.4.0 The `$feed` parameter was added.
     *
     * @param bool   $is_comment_feed Whether the feed is a comment feed.
     * @param string $feed            The feed name.
     */
    do_action("do_feed_{$feed}", $wp_query->is_comment_feed, $feed);
}

//.........这里部分代码省略.........
                } else {
                    // Taxonomy is accessable via a "pretty-URL"
                    $redirect['path'] = $tax_url['path'];
                }
            }
        } elseif (is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false) {
            $category = get_term_by('slug', get_query_var('category_name'), 'category');
            $post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
            if (!$category || is_wp_error($category) || !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms)) {
                $redirect_url = get_permalink($wp_query->get_queried_object_id());
            }
        }
        // paging and feeds
        if (get_query_var('paged') || is_feed() || get_query_var('cpage')) {
            if (!$redirect_url) {
                $redirect_url = $requested_url;
            }
            $paged_redirect = @parse_url($redirect_url);
            while (preg_match('#/page/?[0-9]+?(/+)?$#', $paged_redirect['path']) || preg_match('#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $paged_redirect['path']) || preg_match('#/comment-page-[0-9]+(/+)?$#', $paged_redirect['path'])) {
                // Strip off paging and feed
                $paged_redirect['path'] = preg_replace('#/page/?[0-9]+?(/+)?$#', '/', $paged_redirect['path']);
                // strip off any existing paging
                $paged_redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $paged_redirect['path']);
                // strip off feed endings
                $paged_redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $paged_redirect['path']);
                // strip off any existing comment paging
            }
            $addl_path = '';
            if (is_feed()) {
                $addl_path = !empty($addl_path) ? trailingslashit($addl_path) : '';
                if (get_query_var('withcomments')) {
                    $addl_path .= 'comments/';
                }
                $addl_path .= user_trailingslashit('feed/' . (get_default_feed() == get_query_var('feed') || 'feed' == get_query_var('feed') ? '' : get_query_var('feed')), 'feed');
                $redirect['query'] = remove_query_arg('feed', $redirect['query']);
            }
            if (get_query_var('paged') > 0) {
                $paged = get_query_var('paged');
                $redirect['query'] = remove_query_arg('paged', $redirect['query']);
                if (!is_feed()) {
                    if ($paged > 1 && !is_single()) {
                        $addl_path = (!empty($addl_path) ? trailingslashit($addl_path) : '') . user_trailingslashit("page/{$paged}", 'paged');
                    } elseif (!is_single()) {
                        $addl_path = !empty($addl_path) ? trailingslashit($addl_path) : '';
                    }
                } elseif ($paged > 1) {
                    $redirect['query'] = add_query_arg('paged', $paged, $redirect['query']);
                }
            }
            if (get_option('page_comments') && ('newest' == get_option('default_comments_page') && get_query_var('cpage') > 0 || 'newest' != get_option('default_comments_page') && get_query_var('cpage') > 1)) {
                $addl_path = (!empty($addl_path) ? trailingslashit($addl_path) : '') . user_trailingslashit('comment-page-' . get_query_var('cpage'), 'commentpaged');
                $redirect['query'] = remove_query_arg('cpage', $redirect['query']);
            }
            $paged_redirect['path'] = user_trailingslashit(preg_replace('|/index.php/?$|', '/', $paged_redirect['path']));
            // strip off trailing /index.php/
            if (!empty($addl_path) && $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false) {
                $paged_redirect['path'] = trailingslashit($paged_redirect['path']) . 'index.php/';
            }
            if (!empty($addl_path)) {
                $paged_redirect['path'] = trailingslashit($paged_redirect['path']) . $addl_path;
            }
            $redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path'];
            $redirect['path'] = $paged_redirect['path'];
        }
    }
    // tack on any additional query vars

 /**
  * Parses a Facetious query string such as '/keyword/hello+world/foo/bar/' and returns its
  * corresponding query variables
  *
  * @param $query string A Facetious query string
  * @return array An associative array of query variables
  * @author John Blackbourn
  **/
 function parse_search($query)
 {
     $return = array();
     $parts = explode('/', $query);
     # Strip accidental empty parts (such as '/foo//bar/'):
     $parts = array_filter($parts);
     $parts = array_values($parts);
     # If we've got a trailing '/feed/' we need to push the default feed name onto the end
     if ('feed' == end($parts)) {
         array_push($parts, get_default_feed());
     }
     # If we've got an odd number of parts then the first part is the keyword search so we prepend the 's' part.
     if (count($parts) % 2) {
         array_unshift($parts, 's');
     }
     # Loop over every even-indexed part and populate our query variable array
     for ($i = 0; $i < count($parts); $i = $i + 2) {
         $key = $this->get_search_var($parts[$i]);
         $val = $this->decode($parts[$i + 1]);
         $return[$key] = $val;
     }
     return $return;
 }

function get_search_comments_feed_link($search_query = '', $feed = '')
{
    if (empty($search_query)) {
        $search = attribute_escape(get_search_query());
    } else {
        $search = attribute_escape(stripslashes($search_query));
    }
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $link = get_option('home') . "?s={$search}&feed=comments-{$feed}";
    $link = apply_filters('search_feed_link', $link);
    return $link;
}

 /**
  * Sends additional HTTP headers for caching, content type, etc.
  *
  * Sets the Content-Type header. Sets the 'error' status (if passed) and optionally exits.
  * If showing a feed, it will also send Last-Modified, ETag, and 304 status if needed.
  *
  * @since 2.0.0
  * @since 4.4.0 `X-Pingback` header is added conditionally after posts have been queried in handle_404().
  * @access public
  */
 public function send_headers()
 {
     $headers = array();
     $status = null;
     $exit_required = false;
     if (is_user_logged_in()) {
         $headers = array_merge($headers, wp_get_nocache_headers());
     }
     if (!empty($this->query_vars['error'])) {
         $status = (int) $this->query_vars['error'];
         if (404 === $status) {
             if (!is_user_logged_in()) {
                 $headers = array_merge($headers, wp_get_nocache_headers());
             }
             $headers['Content-Type'] = get_option('html_type') . '; charset=' . get_option('blog_charset');
         } elseif (in_array($status, array(403, 500, 502, 503))) {
             $exit_required = true;
         }
     } elseif (empty($this->query_vars['feed'])) {
         $headers['Content-Type'] = get_option('html_type') . '; charset=' . get_option('blog_charset');
     } else {
         // Set the correct content type for feeds
         $type = $this->query_vars['feed'];
         if ('feed' == $this->query_vars['feed']) {
             $type = get_default_feed();
         }
         $headers['Content-Type'] = feed_content_type($type) . '; charset=' . get_option('blog_charset');
         // We're showing a feed, so WP is indeed the only thing that last changed
         if (!empty($this->query_vars['withcomments']) || false !== strpos($this->query_vars['feed'], 'comments-') || empty($this->query_vars['withoutcomments']) && (!empty($this->query_vars['p']) || !empty($this->query_vars['name']) || !empty($this->query_vars['page_id']) || !empty($this->query_vars['pagename']) || !empty($this->query_vars['attachment']) || !empty($this->query_vars['attachment_id']))) {
             $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastcommentmodified('GMT'), 0) . ' GMT';
         } else {
             $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastpostmodified('GMT'), 0) . ' GMT';
         }
         $wp_etag = '"' . md5($wp_last_modified) . '"';
         $headers['Last-Modified'] = $wp_last_modified;
         $headers['ETag'] = $wp_etag;
         // Support for Conditional GET
         if (isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
             $client_etag = wp_unslash($_SERVER['HTTP_IF_NONE_MATCH']);
         } else {
             $client_etag = false;
         }
         $client_last_modified = empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? '' : trim($_SERVER['HTTP_IF_MODIFIED_SINCE']);
         // If string is empty, return 0. If not, attempt to parse into a timestamp
         $client_modified_timestamp = $client_last_modified ? strtotime($client_last_modified) : 0;
         // Make a timestamp for our most recent modification...
         $wp_modified_timestamp = strtotime($wp_last_modified);
         if ($client_last_modified && $client_etag ? $client_modified_timestamp >= $wp_modified_timestamp && $client_etag == $wp_etag : $client_modified_timestamp >= $wp_modified_timestamp || $client_etag == $wp_etag) {
             $status = 304;
             $exit_required = true;
         }
     }
     /**
      * Filter the HTTP headers before they're sent to the browser.
      *
      * @since 2.8.0
      *
      * @param array $headers The list of headers to be sent.
      * @param WP    $this    Current WordPress environment instance.
      */
     $headers = apply_filters('wp_headers', $headers, $this);
     if (!empty($status)) {
         status_header($status);
     }
     // If Last-Modified is set to false, it should not be sent (no-cache situation).
     if (isset($headers['Last-Modified']) && false === $headers['Last-Modified']) {
         unset($headers['Last-Modified']);
         // In PHP 5.3+, make sure we are not sending a Last-Modified header.
         if (function_exists('header_remove')) {
             @header_remove('Last-Modified');
         } else {
             // In PHP 5.2, send an empty Last-Modified header, but only as a
             // last resort to override a header already sent. #WP23021
             foreach (headers_list() as $header) {
                 if (0 === stripos($header, 'Last-Modified')) {
                     $headers['Last-Modified'] = '';
                     break;
                 }
             }
         }
     }
     foreach ((array) $headers as $name => $field_value) {
         @header("{$name}: {$field_value}");
     }
     if ($exit_required) {
         exit;
     }
     /**
      * Fires once the requested HTTP headers for caching, content type, etc. have been sent.
      *
//.........这里部分代码省略.........

/**
 * Load the feed template from the use of an action hook.
 *
 * If the feed action does not have a hook, then the function will die with a
 * message telling the visitor that the feed is not valid.
 *
 * It is better to only have one hook for each feed.
 *
 * @since 2.1.0
 *
 * @global WP_Query $wp_query Used to tell if the use a comment feed.
 */
function do_feed()
{
    global $wp_query;
    $feed = get_query_var('feed');
    // Remove the pad, if present.
    $feed = preg_replace('/^_+/', '', $feed);
    if ($feed == '' || $feed == 'feed') {
        $feed = get_default_feed();
    }
    if (!has_action("do_feed_{$feed}")) {
        wp_die(__('ERROR: This is not a valid feed template.'), '', array('response' => 404));
    }
    /**
     * Fires once the given feed is loaded.
     *
     * The dynamic portion of the hook name, `$feed`, refers to the feed template name.
     * Possible values include: 'rdf', 'rss', 'rss2', and 'atom'.
     *
     * @since 2.1.0
     * @since 4.4.0 The `$feed` parameter was added.
     *
     * @param bool   $is_comment_feed Whether the feed is a comment feed.
     * @param string $feed            The feed name.
     */
    do_action("do_feed_{$feed}", $wp_query->is_comment_feed, $feed);
}

/**
 * Retrieve the permalink for the comments feed of the search results.
 *
 * @since 2.5.0
 *
 * @param string $search_query Optional. Search query.
 * @param string $feed Optional. Feed type.
 * @return string
 */
function get_search_comments_feed_link($search_query = '', $feed = '')
{
    global $wp_rewrite;
    if (empty($feed)) {
        $feed = get_default_feed();
    }
    $link = get_search_feed_link($search_query, $feed);
    $permastruct = $wp_rewrite->get_search_permastruct();
    if (empty($permastruct)) {
        $link = add_query_arg('feed', 'comments-' . $feed, $link);
    } else {
        $link = add_query_arg('withcomments', 1, $link);
    }
    $link = apply_filters('search_feed_link', $link, $feed, 'comments');
    return $link;
}

//.........这里部分代码省略.........
            }
        } elseif (is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false && ($cat = get_query_var('category_name'))) {
            $category = get_category_by_path($cat);
            $post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
            if (!$category || is_wp_error($category) || !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms)) {
                $redirect_url = get_permalink($wp_query->get_queried_object_id());
            }
        }
        // Post Paging
        if (is_singular() && !is_front_page() && get_query_var('page')) {
            if (!$redirect_url) {
                $redirect_url = get_permalink(get_queried_object_id());
            }
            $redirect_url = trailingslashit($redirect_url) . user_trailingslashit(get_query_var('page'), 'single_paged');
            $redirect['query'] = remove_query_arg('page', $redirect['query']);
        }
        // paging and feeds
        if (get_query_var('paged') || is_feed() || get_query_var('cpage')) {
            while (preg_match("#/{$wp_rewrite->pagination_base}/?[0-9]+?(/+)?\$#", $redirect['path']) || preg_match('#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $redirect['path']) || preg_match("#/{$wp_rewrite->comments_pagination_base}-[0-9]+(/+)?\$#", $redirect['path'])) {
                // Strip off paging and feed
                $redirect['path'] = preg_replace("#/{$wp_rewrite->pagination_base}/?[0-9]+?(/+)?\$#", '/', $redirect['path']);
                // strip off any existing paging
                $redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path']);
                // strip off feed endings
                $redirect['path'] = preg_replace("#/{$wp_rewrite->comments_pagination_base}-[0-9]+?(/+)?\$#", '/', $redirect['path']);
                // strip off any existing comment paging
            }
            $addl_path = '';
            if (is_feed() && in_array(get_query_var('feed'), $wp_rewrite->feeds)) {
                $addl_path = !empty($addl_path) ? trailingslashit($addl_path) : '';
                if (!is_singular() && get_query_var('withcomments')) {
                    $addl_path .= 'comments/';
                }
                if ('rss' == get_default_feed() && 'feed' == get_query_var('feed') || 'rss' == get_query_var('feed')) {
                    $addl_path .= user_trailingslashit('feed/' . (get_default_feed() == 'rss2' ? '' : 'rss2'), 'feed');
                } else {
                    $addl_path .= user_trailingslashit('feed/' . (get_default_feed() == get_query_var('feed') || 'feed' == get_query_var('feed') ? '' : get_query_var('feed')), 'feed');
                }
                $redirect['query'] = remove_query_arg('feed', $redirect['query']);
            } elseif (is_feed() && 'old' == get_query_var('feed')) {
                $old_feed_files = array('wp-atom.php' => 'atom', 'wp-commentsrss2.php' => 'comments_rss2', 'wp-feed.php' => get_default_feed(), 'wp-rdf.php' => 'rdf', 'wp-rss.php' => 'rss2', 'wp-rss2.php' => 'rss2');
                if (isset($old_feed_files[basename($redirect['path'])])) {
                    $redirect_url = get_feed_link($old_feed_files[basename($redirect['path'])]);
                    wp_redirect($redirect_url, 301);
                    die;
                }
            }
            if (get_query_var('paged') > 0) {
                $paged = get_query_var('paged');
                $redirect['query'] = remove_query_arg('paged', $redirect['query']);
                if (!is_feed()) {
                    if ($paged > 1 && !is_single()) {
                        $addl_path = (!empty($addl_path) ? trailingslashit($addl_path) : '') . user_trailingslashit("{$wp_rewrite->pagination_base}/{$paged}", 'paged');
                    } elseif (!is_single()) {
                        $addl_path = !empty($addl_path) ? trailingslashit($addl_path) : '';
                    }
                } elseif ($paged > 1) {
                    $redirect['query'] = add_query_arg('paged', $paged, $redirect['query']);
                }
            }
            if (get_option('page_comments') && ('newest' == get_option('default_comments_page') && get_query_var('cpage') > 0 || 'newest' != get_option('default_comments_page') && get_query_var('cpage') > 1)) {
                $addl_path = (!empty($addl_path) ? trailingslashit($addl_path) : '') . user_trailingslashit($wp_rewrite->comments_pagination_base . '-' . get_query_var('cpage'), 'commentpaged');
                $redirect['query'] = remove_query_arg('cpage', $redirect['query']);
            }
            $redirect['path'] = user_trailingslashit(preg_replace('|/' . preg_quote($wp_rewrite->index, '|') . '/?$|', '/', $redirect['path']));
            // strip off trailing /index.php/

/**
 * Loads the feed template from the use of an action hook.
 *
 * If the feed action does not have a hook, then the function will die with a
 * message telling the visitor that the feed is not valid.
 *
 * It is better to only have one hook for each feed.
 *
 * @since 2.1.0
 * @uses $wp_query Used to tell if the use a comment feed.
 * @uses do_action() Calls 'do_feed_$feed' hook, if a hook exists for the feed.
 */
function do_feed()
{
    global $wp_query;
    $feed = get_query_var('feed');
    // Remove the pad, if present.
    $feed = preg_replace('/^_+/', '', $feed);
    if ($feed == '' || $feed == 'feed') {
        $feed = get_default_feed();
    }
    $hook = 'do_feed_' . $feed;
    if (!has_action($hook)) {
        $message = sprintf(__('ERROR: %s is not a valid feed template'), wp_specialchars($feed));
        wp_die($message);
    }
    do_action($hook, $wp_query->is_comment_feed);
}

//.........这里部分代码省略.........
					}
				}

			}
		} elseif ( is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false && $cat = get_query_var( 'category_name' ) ) {
			$category = get_category_by_path( $cat );
			$post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
			if ( (!$category || is_wp_error($category)) || ( !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms) ) )
				$redirect_url = get_permalink($wp_query->get_queried_object_id());
		}

		// Post Paging
		if ( is_singular() && ! is_front_page() && get_query_var('page') ) {
			if ( !$redirect_url )
				$redirect_url = get_permalink( get_queried_object_id() );
			$redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
			$redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
		}

		// paging and feeds
		if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) {
			while ( preg_match( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", $redirect['path'] ) || preg_match( '#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $redirect['path'] ) || preg_match( '#/comment-page-[0-9]+(/+)?$#', $redirect['path'] ) ) {
				// Strip off paging and feed
				$redirect['path'] = preg_replace("#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", '/', $redirect['path']); // strip off any existing paging
				$redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path']); // strip off feed endings
				$redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $redirect['path']); // strip off any existing comment paging
			}

			$addl_path = '';
			if ( is_feed() && in_array( get_query_var('feed'), $wp_rewrite->feeds ) ) {
				$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
				if ( !is_singular() && get_query_var( 'withcomments' ) )
					$addl_path .= 'comments/';
				if ( ( 'rss' == get_default_feed() && 'feed' == get_query_var('feed') ) || 'rss' == get_query_var('feed') )
					$addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == 'rss2' ) ? '' : 'rss2' ), 'feed' );
				else
					$addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() ==  get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
				$redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
			} elseif ( is_feed() && 'old' == get_query_var('feed') ) {
				$old_feed_files = array(
					'wp-atom.php'         => 'atom',
					'wp-commentsrss2.php' => 'comments_rss2',
					'wp-feed.php'         => get_default_feed(),
					'wp-rdf.php'          => 'rdf',
					'wp-rss.php'          => 'rss2',
					'wp-rss2.php'         => 'rss2',
				);
				if ( isset( $old_feed_files[ basename( $redirect['path'] ) ] ) ) {
					$redirect_url = get_feed_link( $old_feed_files[ basename( $redirect['path'] ) ] );
					wp_redirect( $redirect_url, 301 );
					die();
				}
			}

			if ( get_query_var('paged') > 0 ) {
				$paged = get_query_var('paged');
				$redirect['query'] = remove_query_arg( 'paged', $redirect['query'] );
				if ( !is_feed() ) {
					if ( $paged > 1 && !is_single() ) {
						$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("$wp_rewrite->pagination_base/$paged", 'paged');
					} elseif ( !is_single() ) {
						$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
					}
				} elseif ( $paged > 1 ) {
					$redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );
				}