Parsed: 114495

function redirect_canonical( $requested_url = null, $do_redirect = true ) {
  global $wp_rewrite, $is_IIS, $wp_query, $wpdb, $wp;

  if ( isset( $_SERVER['REQUEST_METHOD'] ) && ! in_array( strtoupper( $_SERVER['REQUEST_METHOD'] ), array( 'GET', 'HEAD' ), true ) ) {
    return;
  }

  // If we're not in wp-admin and the post has been published and preview nonce
  // is non-existent or invalid then no need for preview in query.
  if ( is_preview() && get_query_var( 'p' ) && 'publish' === get_post_status( get_query_var( 'p' ) ) ) {
    if ( ! isset( $_GET['preview_id'] )
      || ! isset( $_GET['preview_nonce'] )
      || ! wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . (int) $_GET['preview_id'] )
    ) {
      $wp_query->is_preview = false;
    }
  }

  if ( is_admin() || is_search() || is_preview() || is_trackback() || is_favicon()
    || ( $is_IIS && ! iis7_supports_permalinks() )
  ) {
    return;
  }

  if ( ! $requested_url && isset( $_SERVER['HTTP_HOST'] ) ) {
    // Build the URL in the address bar.
    $requested_url  = is_ssl() ? 'https://' : 'http://';
    $requested_url .= $_SERVER['HTTP_HOST'];
    $requested_url .= $_SERVER['REQUEST_URI'];
  }

  $original = parse_url( $requested_url );
  if ( false === $original ) {
    return;
  }

  $redirect     = $original;
  $redirect_url = false;
  $redirect_obj = false;

  // Notice fixing.
  if ( ! isset( $redirect['path'] ) ) {
    $redirect['path'] = '';
  }
  if ( ! isset( $redirect['query'] ) ) {
    $redirect['query'] = '';
  }

  /*
	 * If the original URL ended with non-breaking spaces, they were almost
	 * certainly inserted by accident. Let's remove them, so the reader doesn't
	 * see a 404 error with no obvious cause.
	 */
  $redirect['path'] = preg_replace( '|(%C2%A0)+$|i', '', $redirect['path'] );

  // It's not a preview, so remove it from URL.
  if ( get_query_var( 'preview' ) ) {
    $redirect['query'] = remove_query_arg( 'preview', $redirect['query'] );
  }

  $post_id = get_query_var( 'p' );

  if ( is_feed() && $post_id ) {
    $redirect_url = get_post_comments_feed_link( $post_id, get_query_var( 'feed' ) );
    $redirect_obj = get_post( $post_id );

    if ( $redirect_url ) {
      $redirect['query'] = _remove_qs_args_if_not_in_url(
        $redirect['query'],
        array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type', 'feed' ),
        $redirect_url
      );

      $redirect['path'] = parse_url( $redirect_url, PHP_URL_PATH );
    }
  }

  if ( is_singular() && $wp_query->post_count < 1 && $post_id ) {

    $vars = $wpdb->get_results( $wpdb->prepare( "SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $post_id ) );

    if ( ! empty( $vars[0] ) ) {
      $vars = $vars[0];

      if ( 'revision' === $vars->post_type && $vars->post_parent > 0 ) {
        $post_id = $vars->post_parent;
      }

      $redirect_url = get_permalink( $post_id );
      $redirect_obj = get_post( $post_id );

      if ( $redirect_url ) {
        $redirect['query'] = _remove_qs_args_if_not_in_url(
          $redirect['query'],
          array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ),
          $redirect_url
        );
      }
    }
  }

  // These tests give us a WP-generated permalink.
  if ( is_404() ) {

    // Redirect ?page_id, ?p=, ?attachment_id= to their respective URLs.
    $post_id = max( get_query_var( 'p' ), get_query_var( 'page_id' ), get_query_var( 'attachment_id' ) );

    $redirect_post = $post_id ? get_post( $post_id ) : false;

    if ( $redirect_post ) {
      $post_type_obj = get_post_type_object( $redirect_post->post_type );

      if ( $post_type_obj && $post_type_obj->public && 'auto-draft' !== $redirect_post->post_status ) {
        $redirect_url = get_permalink( $redirect_post );
        $redirect_obj = get_post( $redirect_post );

        $redirect['query'] = _remove_qs_args_if_not_in_url(
          $redirect['query'],
          array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ),
          $redirect_url
        );
      }
    }

    $year  = get_query_var( 'year' );
    $month = get_query_var( 'monthnum' );
    $day   = get_query_var( 'day' );

    if ( $year && $month && $day ) {
      $date = sprintf( '%04d-%02d-%02d', $year, $month, $day );

      if ( ! wp_checkdate( $month, $day, $year, $date ) ) {
        $redirect_url = get_month_link( $year, $month );

        $redirect['query'] = _remove_qs_args_if_not_in_url(
          $redirect['query'],
          array( 'year', 'monthnum', 'day' ),
          $redirect_url
        );
      }
    } elseif ( $year && $month && $month > 12 ) {
      $redirect_url = get_year_link( $year );

      $redirect['query'] = _remove_qs_args_if_not_in_url(
        $redirect['query'],
        array( 'year', 'monthnum' ),
        $redirect_url
      );
    }

    // Strip off non-existing <!--nextpage--> links from single posts or pages.
    if ( get_query_var( 'page' ) ) {
      $post_id = 0;

      if ( $wp_query->queried_object instanceof WP_Post ) {
        $post_id = $wp_query->queried_object->ID;
      } elseif ( $wp_query->post ) {
        $post_id = $wp_query->post->ID;
      }

      if ( $post_id ) {
        $redirect_url = get_permalink( $post_id );
        $redirect_obj = get_post( $post_id );

        $redirect['path']  = rtrim( $redirect['path'], (int) get_query_var( 'page' ) . '/' );
        $redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
      }
    }

    if ( ! $redirect_url ) {
      $redirect_url = redirect_guess_404_permalink();

      if ( $redirect_url ) {
        $redirect['query'] = _remove_qs_args_if_not_in_url(
          $redirect['query'],
          array( 'page', 'feed', 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ),
          $redirect_url
        );
      }
    }
  } elseif ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) {

    // Rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101.
    if ( is_attachment()
      && ! array_diff( array_keys( $wp->query_vars ), array( 'attachment', 'attachment_id' ) )
      && ! $redirect_url
    ) {
      if ( ! empty( $_GET['attachment_id'] ) ) {
        $redirect_url = get_attachment_link( get_query_var( 'attachment_id' ) );
        $redirect_obj = get_post( get_query_var( 'attachment_id' ) );

        if ( $redirect_url ) {
          $redirect['query'] = remove_query_arg( 'attachment_id', $redirect['query'] );
        }
      } else {
        $redirect_url = get_attachment_link();
        $redirect_obj = get_post();
      }
    } elseif ( is_single() && ! empty( $_GET['p'] ) && ! $redirect_url ) {
      $redirect_url = get_permalink( get_query_var( 'p' ) );
      $redirect_obj = get_post( get_query_var( 'p' ) );

      if ( $redirect_url ) {
        $redirect['query'] = remove_query_arg( array( 'p', 'post_type' ), $redirect['query'] );
      }
    } elseif ( is_single() && ! empty( $_GET['name'] ) && ! $redirect_url ) {
      $redirect_url = get_permalink( $wp_query->get_queried_object_id() );
      $redirect_obj = get_post( $wp_query->get_queried_object_id() );

      if ( $redirect_url ) {
        $redirect['query'] = remove_query_arg( 'name', $redirect['query'] );
      }
    } elseif ( is_page() && ! empty( $_GET['page_id'] ) && ! $redirect_url ) {
      $redirect_url = get_permalink( get_query_var( 'page_id' ) );
      $redirect_obj = get_post( get_query_var( 'page_id' ) );

      if ( $redirect_url ) {
        $redirect['query'] = remove_query_arg( 'page_id', $redirect['query'] );
      }
    } elseif ( is_page() && ! is_feed() && ! $redirect_url
      && 'page' === get_option( 'show_on_front' ) && get_queried_object_id() === (int) get_option( 'page_on_front' )
    ) {
      $redirect_url = home_url( '/' );
    } elseif ( is_home() && ! empty( $_GET['page_id'] ) && ! $redirect_url
      && 'page' === get_option( 'show_on_front' ) && get_query_var( 'page_id' ) === (int) get_option( 'page_for_posts' )
    ) {
      $redirect_url = get_permalink( get_option( 'page_for_posts' ) );
      $redirect_obj = get_post( get_option( 'page_for_posts' ) );

      if ( $redirect_url ) {
        $redirect['query'] = remove_query_arg( 'page_id', $redirect['query'] );
      }
    } elseif ( ! empty( $_GET['m'] ) && ( is_year() || is_month() || is_day() ) ) {
      $m = get_query_var( 'm' );

      switch ( strlen( $m ) ) {
        case 4: // Yearly.
          $redirect_url = get_year_link( $m );
          break;
        case 6: // Monthly.
          $redirect_url = get_month_link( substr( $m, 0, 4 ), substr( $m, 4, 2 ) );
          break;
        case 8: // Daily.
          $redirect_url = get_day_link( substr( $m, 0, 4 ), substr( $m, 4, 2 ), substr( $m, 6, 2 ) );
          break;
      }

      if ( $redirect_url ) {
        $redirect['query'] = remove_query_arg( 'm', $redirect['query'] );
      }
      // Now moving on to non ?m=X year/month/day links.
    } elseif ( is_date() ) {
      $year  = get_query_var( 'year' );
      $month = get_query_var( 'monthnum' );
      $day   = get_query_var( 'day' );

      if ( is_day() && $year && $month && ! empty( $_GET['day'] ) ) {
        $redirect_url = get_day_link( $year, $month, $day );

        if ( $redirect_url ) {
          $redirect['query'] = remove_query_arg( array( 'year', 'monthnum', 'day' ), $redirect['query'] );
        }
      } elseif ( is_month() && $year && ! empty( $_GET['monthnum'] ) ) {
        $redirect_url = get_month_link( $year, $month );

        if ( $redirect_url ) {
          $redirect['query'] = remove_query_arg( array( 'year', 'monthnum' ), $redirect['query'] );
        }
      } elseif ( is_year() && ! empty( $_GET['year'] ) ) {
        $redirect_url = get_year_link( $year );

        if ( $redirect_url ) {
          $redirect['query'] = remove_query_arg( 'year', $redirect['query'] );
        }
      }
    } elseif ( is_author() && ! empty( $_GET['author'] ) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) {
      $author = get_userdata( get_query_var( 'author' ) );

      if ( false !== $author
        && $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE $wpdb->posts.post_author = %d AND $wpdb->posts.post_status = 'publish' LIMIT 1", $author->ID ) )
      ) {
        $redirect_url = get_author_posts_url( $author->ID, $author->user_nicename );
        $redirect_obj = $author;

        if ( $redirect_url ) {
          $redirect['query'] = remove_query_arg( 'author', $redirect['query'] );
        }
      }
    } elseif ( is_category() || is_tag() || is_tax() ) { // Terms (tags/categories).
      $term_count = 0;

      foreach ( $wp_query->tax_query->queried_terms as $tax_query ) {
        if ( isset( $tax_query['terms'] ) && is_countable( $tax_query['terms'] ) ) {
          $term_count += count( $tax_query['terms'] );
        }
      }

      $obj = $wp_query->get_queried_object();

      if ( $term_count <= 1 && ! empty( $obj->term_id ) ) {
        $tax_url = get_term_link( (int) $obj->term_id, $obj->taxonomy );

        if ( $tax_url && ! is_wp_error( $tax_url ) ) {
          if ( ! empty( $redirect['query'] ) ) {
            // Strip taxonomy query vars off the URL.
            $qv_remove = array( 'term', 'taxonomy' );

            if ( is_category() ) {
              $qv_remove[] = 'category_name';
              $qv_remove[] = 'cat';
            } elseif ( is_tag() ) {
              $qv_remove[] = 'tag';
              $qv_remove[] = 'tag_id';
            } else {
              // Custom taxonomies will have a custom query var, remove those too.
              $tax_obj = get_taxonomy( $obj->taxonomy );
              if ( false !== $tax_obj->query_var ) {
                $qv_remove[] = $tax_obj->query_var;
              }
            }

            $rewrite_vars = array_diff( array_keys( $wp_query->query ), array_keys( $_GET ) );

            // Check to see if all the query vars are coming from the rewrite, none are set via $_GET.
            if ( ! array_diff( $rewrite_vars, array_keys( $_GET ) ) ) {
              // Remove all of the per-tax query vars.
              $redirect['query'] = remove_query_arg( $qv_remove, $redirect['query'] );

              // Create the destination URL for this taxonomy.
              $tax_url = parse_url( $tax_url );

              if ( ! empty( $tax_url['query'] ) ) {
                // Taxonomy accessible via ?taxonomy=...&term=... or any custom query var.
                parse_str( $tax_url['query'], $query_vars );
                $redirect['query'] = add_query_arg( $query_vars, $redirect['query'] );
              } else {
                // Taxonomy is accessible via a "pretty URL".
                $redirect['path'] = $tax_url['path'];
              }
            } else {
              // Some query vars are set via $_GET. Unset those from $_GET that exist via the rewrite.
              foreach ( $qv_remove as $_qv ) {
                if ( isset( $rewrite_vars[ $_qv ] ) ) {
                  $redirect['query'] = remove_query_arg( $_qv, $redirect['query'] );
                }
              }
            }
          }
        }
      }
    } elseif ( is_single() && strpos( $wp_rewrite->permalink_structure, '%category%' ) !== false ) {
      $category_name = get_query_var( 'category_name' );

      if ( $category_name ) {
        $category = get_category_by_path( $category_name );

        if ( ! $category || is_wp_error( $category )
          || ! has_term( $category->term_id, 'category', $wp_query->get_queried_object_id() )
        ) {
          $redirect_url = get_permalink( $wp_query->get_queried_object_id() );
          $redirect_obj = get_post( $wp_query->get_queried_object_id() );
        }
      }
    }

    // Post paging.
    if ( is_singular() && get_query_var( 'page' ) ) {
      $page = get_query_var( 'page' );

      if ( ! $redirect_url ) {
        $redirect_url = get_permalink( get_queried_object_id() );
        $redirect_obj = get_post( get_queried_object_id() );
      }

      if ( $page > 1 ) {
        $redirect_url = trailingslashit( $redirect_url );

        if ( is_front_page() ) {
          $redirect_url .= user_trailingslashit( "$wp_rewrite->pagination_base/$page", 'paged' );
        } else {
          $redirect_url .= user_trailingslashit( $page, 'single_paged' );
        }
      }

      $redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
    }

    if ( get_query_var( 'sitemap' ) ) {
      $redirect_url      = get_sitemap_url( get_query_var( 'sitemap' ), get_query_var( 'sitemap-subtype' ), get_query_var( 'paged' ) );
      $redirect['query'] = remove_query_arg( array( 'sitemap', 'sitemap-subtype', 'paged' ), $redirect['query'] );
    } elseif ( get_query_var( 'paged' ) || is_feed() || get_query_var( 'cpage' ) ) {
      // Paging and feeds.
      $paged = get_query_var( 'paged' );
      $feed  = get_query_var( 'feed' );
      $cpage = get_query_var( 'cpage' );

      while ( preg_match( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", $redirect['path'] )
        || preg_match( '#/(comments/?)?(feed|rss2?|rdf|atom)(/+)?$#', $redirect['path'] )
        || preg_match( "#/{$wp_rewrite->comments_pagination_base}-[0-9]+(/+)?$#", $redirect['path'] )
      ) {
        // Strip off any existing paging.
        $redirect['path'] = preg_replace( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", '/', $redirect['path'] );
        // Strip off feed endings.
        $redirect['path'] = preg_replace( '#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path'] );
        // Strip off any existing comment paging.
        $redirect['path'] = preg_replace( "#/{$wp_rewrite->comments_pagination_base}-[0-9]+?(/+)?$#", '/', $redirect['path'] );
      }

      $addl_path    = '';
      $default_feed = get_default_feed();

      if ( is_feed() && in_array( $feed, $wp_rewrite->feeds, true ) ) {
        $addl_path = ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '';

        if ( ! is_singular() && get_query_var( 'withcomments' ) ) {
          $addl_path .= 'comments/';
        }

        if ( ( 'rss' === $default_feed && 'feed' === $feed ) || 'rss' === $feed ) {
          $format = ( 'rss2' === $default_feed ) ? '' : 'rss2';
        } else {
          $format = ( $default_feed === $feed || 'feed' === $feed ) ? '' : $feed;
        }

        $addl_path .= user_trailingslashit( 'feed/' . $format, 'feed' );

        $redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
      } elseif ( is_feed() && 'old' === $feed ) {
        $old_feed_files = array(
          'wp-atom.php'         => 'atom',
          'wp-commentsrss2.php' => 'comments_rss2',
          'wp-feed.php'         => $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 ( $paged > 0 ) {
        $redirect['query'] = remove_query_arg( 'paged', $redirect['query'] );

        if ( ! is_feed() ) {
          if ( ! is_single() ) {
            $addl_path = ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '';

            if ( $paged > 1 ) {
              $addl_path .= user_trailingslashit( "$wp_rewrite->pagination_base/$paged", 'paged' );
            }
          }
        } elseif ( $paged > 1 ) {
          $redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );
        }
      }

      $default_comments_page = get_option( 'default_comments_page' );

      if ( get_option( 'page_comments' )
        && ( 'newest' === $default_comments_page && $cpage > 0
          || 'newest' !== $default_comments_page && $cpage > 1 )
      ) {
        $addl_path  = ( ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '' );
        $addl_path .= user_trailingslashit( $wp_rewrite->comments_pagination_base . '-' . $cpage, 'commentpaged' );

        $redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] );
      }

      // Strip off trailing /index.php/.
      $redirect['path'] = preg_replace( '|/' . preg_quote( $wp_rewrite->index, '|' ) . '/?$|', '/', $redirect['path'] );
      $redirect['path'] = user_trailingslashit( $redirect['path'] );

      if ( ! empty( $addl_path )
        && $wp_rewrite->using_index_permalinks()
        && strpos( $redirect['path'], '/' . $wp_rewrite->index . '/' ) === false
      ) {
        $redirect['path'] = trailingslashit( $redirect['path'] ) . $wp_rewrite->index . '/';
      }

      if ( ! empty( $addl_path ) ) {
        $redirect['path'] = trailingslashit( $redirect['path'] ) . $addl_path;
      }

      $redirect_url = $redirect['scheme'] . '://' . $redirect['host'] . $redirect['path'];
    }

    if ( 'wp-register.php' === basename( $redirect['path'] ) ) {
      if ( is_multisite() ) {
        
/** This filter is documented in wp-login.php */
        $redirect_url = apply_filters( 'wp_signup_location', network_site_url( 'wp-signup.php' ) );
      } else {
        $redirect_url = wp_registration_url();
      }

      wp_redirect( $redirect_url, 301 );
      die();
    }
  }

  $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );

  // Tack on any additional query vars.
  if ( $redirect_url && ! empty( $redirect['query'] ) ) {
    parse_str( $redirect['query'], $_parsed_query );
    $redirect = parse_url( $redirect_url );

    if ( ! empty( $_parsed_query['name'] ) && ! empty( $redirect['query'] ) ) {
      parse_str( $redirect['query'], $_parsed_redirect_query );

      if ( empty( $_parsed_redirect_query['name'] ) ) {
        unset( $_parsed_query['name'] );
      }
    }

    $_parsed_query = array_combine(
      rawurlencode_deep( array_keys( $_parsed_query ) ),
      rawurlencode_deep( array_values( $_parsed_query ) )
    );

    $redirect_url = add_query_arg( $_parsed_query, $redirect_url );
  }

  if ( $redirect_url ) {
    $redirect = parse_url( $redirect_url );
  }

  // www.example.com vs. example.com
  $user_home = parse_url( home_url() );

  if ( ! empty( $user_home['host'] ) ) {
    $redirect['host'] = $user_home['host'];
  }

  if ( empty( $user_home['path'] ) ) {
    $user_home['path'] = '/';
  }

  // Handle ports.
  if ( ! empty( $user_home['port'] ) ) {
    $redirect['port'] = $user_home['port'];
  } else {
    unset( $redirect['port'] );
  }

  // Trailing /index.php.
  $redirect['path'] = preg_replace( '|/' . preg_quote( $wp_rewrite->index, '|' ) . '/*?$|', '/', $redirect['path'] );

  $punctuation_pattern = implode(
    '|',
    array_map(
      'preg_quote',
      array(
        ' ',
        '%20',  // Space.
        '!',
        '%21',  // Exclamation mark.
        '"',
        '%22',  // Double quote.
        "'",
        '%27',  // Single quote.
        '(',
        '%28',  // Opening bracket.
        ')',
        '%29',  // Closing bracket.
        ',',
        '%2C',  // Comma.
        '.',
        '%2E',  // Period.
        ';',
        '%3B',  // Semicolon.
        '{',
        '%7B',  // Opening curly bracket.
        '}',
        '%7D',  // Closing curly bracket.
        '%E2%80%9C', // Opening curly quote.
        '%E2%80%9D', // Closing curly quote.
      )
    )
  );

  // Remove trailing spaces and end punctuation from the path.
  $redirect['path'] = preg_replace( "#($punctuation_pattern)+$#", '', $redirect['path'] );

  if ( ! empty( $redirect['query'] ) ) {
    // Remove trailing spaces and end punctuation from certain terminating query string args.
    $redirect['query'] = preg_replace( "#((^|&)(p|page_id|cat|tag)=[^&]*?)($punctuation_pattern)+$#", '$1', $redirect['query'] );

    // Clean up empty query strings.
    $redirect['query'] = trim( preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query'] ), '&' );

    // Redirect obsolete feeds.
    $redirect['query'] = preg_replace( '#(^|&)feed=rss(&|$)#', '$1feed=rss2$2', $redirect['query'] );

    // Remove redundant leading ampersands.
    $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
  }

  // Strip /index.php/ when we're not using PATHINFO permalinks.
  if ( ! $wp_rewrite->using_index_permalinks() ) {
    $redirect['path'] = str_replace( '/' . $wp_rewrite->index . '/', '/', $redirect['path'] );
  }

  // Trailing slashes.
  if ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks()
    && ! is_404() && ( ! is_front_page() || is_front_page() && get_query_var( 'paged' ) > 1 )
  ) {
    $user_ts_type = '';

    if ( get_query_var( 'paged' ) > 0 ) {
      $user_ts_type = 'paged';
    } else {
      foreach ( array( 'single', 'category', 'page', 'day', 'month', 'year', 'home' ) as $type ) {
        $func = 'is_' . $type;
        if ( call_user_func( $func ) ) {
          $user_ts_type = $type;
          break;
        }
      }
    }

    $redirect['path'] = user_trailingslashit( $redirect['path'], $user_ts_type );
  } elseif ( is_front_page() ) {
    $redirect['path'] = trailingslashit( $redirect['path'] );
  }

  // Remove trailing slash for robots.txt or sitemap requests.
  if ( is_robots()
    || ! empty( get_query_var( 'sitemap' ) ) || ! empty( get_query_var( 'sitemap-stylesheet' ) )
  ) {
    $redirect['path'] = untrailingslashit( $redirect['path'] );
  }

  // Strip multiple slashes out of the URL.
  if ( strpos( $redirect['path'], '//' ) > -1 ) {
    $redirect['path'] = preg_replace( '|/+|', '/', $redirect['path'] );
  }

  // Always trailing slash the Front Page URL.
  if ( trailingslashit( $redirect['path'] ) === trailingslashit( $user_home['path'] ) ) {
    $redirect['path'] = trailingslashit( $redirect['path'] );
  }

  $original_host_low = strtolower( $original['host'] );
  $redirect_host_low = strtolower( $redirect['host'] );

  // Ignore differences in host capitalization, as this can lead to infinite redirects.
  // Only redirect no-www <=> yes-www.
  if ( $original_host_low === $redirect_host_low
    || ( 'www.' . $original_host_low !== $redirect_host_low
      && 'www.' . $redirect_host_low !== $original_host_low )
  ) {
    $redirect['host'] = $original['host'];
  }

  $compare_original = array( $original['host'], $original['path'] );

  if ( ! empty( $original['port'] ) ) {
    $compare_original[] = $original['port'];
  }

  if ( ! empty( $original['query'] ) ) {
    $compare_original[] = $original['query'];
  }

  $compare_redirect = array( $redirect['host'], $redirect['path'] );

  if ( ! empty( $redirect['port'] ) ) {
    $compare_redirect[] = $redirect['port'];
  }

  if ( ! empty( $redirect['query'] ) ) {
    $compare_redirect[] = $redirect['query'];
  }

  if ( $compare_original !== $compare_redirect ) {
    $redirect_url = $redirect['scheme'] . '://' . $redirect['host'];

    if ( ! empty( $redirect['port'] ) ) {
      $redirect_url .= ':' . $redirect['port'];
    }

    $redirect_url .= $redirect['path'];

    if ( ! empty( $redirect['query'] ) ) {
      $redirect_url .= '?' . $redirect['query'];
    }
  }

  if ( ! $redirect_url || $redirect_url === $requested_url ) {
    return;
  }

  // Hex encoded octets are case-insensitive.
  if ( false !== strpos( $requested_url, '%' ) ) {
    if ( ! function_exists( 'lowercase_octets' ) ) {
      
/**
 * Converts the first hex-encoded octet match to lowercase.
 *
 * @since 3.1.0
 * @ignore
 *
 * @param array $matches Hex-encoded octet matches for the requested URL.
 * @return string Lowercased version of the first match.
 */
      function lowercase_octets( $matches ) {
        return strtolower( $matches[0] );
      }
    }

    $requested_url = preg_replace_callback( '|%[a-fA-F0-9][a-fA-F0-9]|', 'lowercase_octets', $requested_url );
  }

  if ( $redirect_obj instanceof WP_Post ) {
    $post_status_obj = get_post_status_object( get_post_status( $redirect_obj ) );
    /*
		 * Unset the redirect object and URL if they are not readable by the user.
		 * This condition is a little confusing as the condition needs to pass if
		 * the post is not readable by the user. That's why there are ! (not) conditions
		 * throughout.
		 */
    if (
      // Private post statuses only redirect if the user can read them.
      ! (
        $post_status_obj->private &&
        current_user_can( 'read_post', $redirect_obj->ID )
      ) &&
      // For other posts, only redirect if publicly viewable.
      ! is_post_publicly_viewable( $redirect_obj )
    ) {
      $redirect_obj = false;
      $redirect_url = false;
    }
  }

  
/**
 * Filters the canonical redirect URL.
 *
 * Returning false to this filter will cancel the redirect.
 *
 * @since 2.3.0
 *
 * @param string $redirect_url  The redirect URL.
 * @param string $requested_url The requested URL.
 */
  $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url );

  // Yes, again -- in case the filter aborted the request.
  if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) === strip_fragment_from_url( $requested_url ) ) {
    return;
  }

  if ( $do_redirect ) {
    // Protect against chained redirects.
    if ( ! redirect_canonical( $redirect_url, false ) ) {
      wp_redirect( $redirect_url, 301 );
      exit;
    } else {
      // Debug.
      // die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) );
      return;
    }
  } else {
    return $redirect_url;
  }
}