redirect_canonical()WP 2.3.0

Redirects incoming links to the proper URL based on the site url.

Search engines consider www.somedomain.com and somedomain.com to be two different URLs when they both go to the same location. This SEO enhancement prevents penalty for duplicate content by redirecting all incoming links to one or the other.

Prevents redirection for feeds, trackbacks, searches, and admin URLs. Does not redirect on non-pretty-permalink-supporting IIS 7+, page/post previews, WP admin, Trackbacks, robots.txt, favicon.ico, searches, or on POST requests.

Will also attempt to find the correct link when a user enters a URL that does not exist based on exact WordPress query. Will instead try to parse the URL or query in an attempt to figure the correct page to go to.

Hooks from the function

Return

String|null. The string of the URL, if redirect needed.

Usage

redirect_canonical( $requested_url, $do_redirect );
$requested_url(string)
The URL that was requested, used to figure if redirect is needed.
Default: null
$do_redirect(true|false)
Redirect to the new URL.
Default: true

Examples

0

#1 Disabling redirection in posts for pagination

By default, WordPress redirects to the post main page when you try to go to that post's pagination page, but the post have no any pagination pages - see post pagination. Sometimes this behavior needs to be disabled.

For example, let's imagine that we make some module for posts and we need the pagination URL of the posts to work /mypage/page/2 - the function will redirect to /mypage/, but we do not need it and this behavior should be disabled:

// let's turn off redirect in the entries because /page/2 redirects to /
add_filter( 'redirect_canonical', 'page_disable_redirect_canonical' );

function page_disable_redirect_canonical( $redirect_url ){

	if( is_paged() ){
		$redirect_url = false;
	}

	return $redirect_url;
}
0

#2 Completely disables WP canonical redirects feature

This hook completely disables the functionality of canonical redirects:

remove_action( 'template_redirect', 'redirect_canonical' );
0

#3 Remove Redirect for public var like ‘year’ in Custom Taxonomy.

For example, a link: /?event_category=xxx?year=2017

  • If you don’t add this filter - It redirects to /2017/.

  • If you use this filter - It remains at page /?event_category=xxx.

This code is helpful for creating a filter in Taxonomies.

add_filter( 'redirect_canonical', 'pick_event_year_redirect', 10 );

function pick_event_year_redirect( $redirect_url ) {

	if ( is_tax( 'event_category' ) && is_year() ) {
		return '';
	}

	return $redirect_url;
}

Notes

  • Global. WP_Rewrite. $wp_rewrite WordPress rewrite component.
  • Global. true|false. $is_IIS
  • Global. WP_Query. $wp_query WordPress Query object.
  • Global. wpdb. $wpdb WordPress database abstraction object.
  • Global. WP. $wp Current WordPress environment instance.

Changelog

Since 2.3.0 Introduced.

redirect_canonical() code WP 6.6.2

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'] )
			&& is_string( $_GET['author'] ) && preg_match( '|^[0-9]+$|', $_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() && str_contains( $wp_rewrite->permalink_structure, '%category%' ) ) {
			$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()
				&& ! str_contains( $redirect['path'], '/' . $wp_rewrite->index . '/' )
			) {
				$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();
		}
	}

	$is_attachment_redirect = false;

	if ( is_attachment() && ! get_option( 'wp_attachment_pages_enabled' ) ) {
		$attachment_id        = get_query_var( 'attachment_id' );
		$attachment_post      = get_post( $attachment_id );
		$attachment_parent_id = $attachment_post ? $attachment_post->post_parent : 0;

		$attachment_url = wp_get_attachment_url( $attachment_id );
		if ( $attachment_url !== $redirect_url ) {
			/*
			* If an attachment is attached to a post, it inherits the parent post's status. Fetch the
			* parent post to check its status later.
			*/
			if ( $attachment_parent_id ) {
				$redirect_obj = get_post( $attachment_parent_id );
			}
			$redirect_url = $attachment_url;
		}

		$is_attachment_redirect = true;
	}

	$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_attachment_redirect
		&& ! 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 ( str_contains( $redirect['path'], '//' ) ) {
		$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 ( str_contains( $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;
	}
}