<?php

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/**

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* Canonical API to handle WordPress Redirecting

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*

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* Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference"

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* by Mark Jaquith

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*

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* @package WordPress

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* @since 2.3.0

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*/

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/**

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

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*

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* Search engines consider www.somedomain.com and somedomain.com to be two

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* different URLs when they both go to the same location. This SEO enhancement

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* prevents penalty for duplicate content by redirecting all incoming links to

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* one or the other.

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*

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* Prevents redirection for feeds, trackbacks, searches, and

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* admin URLs. Does not redirect on non-pretty-permalink-supporting IIS 7+,

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* page/post previews, WP admin, Trackbacks, robots.txt, favicon.ico, searches,

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* or on POST requests.

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*

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* Will also attempt to find the correct link when a user enters a URL that does

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* not exist based on exact WordPress query. Will instead try to parse the URL

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* or query in an attempt to figure the correct page to go to.

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*

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* @since 2.3.0

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*

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* @global WP_Rewrite $wp_rewrite WordPress rewrite component.

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* @global bool $is_IIS

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* @global WP_Query $wp_query WordPress Query object.

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* @global wpdb $wpdb WordPress database abstraction object.

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* @global WP $wp Current WordPress environment instance.

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*

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* @param string $requested_url Optional. The URL that was requested, used to

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* figure if redirect is needed.

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* @param bool $do_redirect Optional. Redirect to the new URL.

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* @return string|void The string of the URL, if redirect needed.

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*/

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function redirect_canonical( $requested_url = null, $do_redirect = true ) {

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global $wp_rewrite, $is_IIS, $wp_query, $wpdb, $wp;

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

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return;

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}

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// If we're not in wp-admin and the post has been published and preview nonce

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// is non-existent or invalid then no need for preview in query.

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if ( is_preview() && get_query_var( 'p' ) && 'publish' === get_post_status( get_query_var( 'p' ) ) ) {

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if ( ! isset( $_GET['preview_id'] )

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|| ! isset( $_GET['preview_nonce'] )

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|| ! wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . (int) $_GET['preview_id'] )

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) {

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$wp_query->is_preview = false;

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}

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}

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if ( is_admin() || is_search() || is_preview() || is_trackback() || is_favicon()

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|| ( $is_IIS && ! iis7_supports_permalinks() )

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) {

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return;

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}

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if ( ! $requested_url && isset( $_SERVER['HTTP_HOST'] ) ) {

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// Build the URL in the address bar.

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$requested_url = is_ssl() ? 'https://' : 'http://';

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$requested_url .= $_SERVER['HTTP_HOST'];

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$requested_url .= $_SERVER['REQUEST_URI'];

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}

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$original = parse_url( $requested_url );

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if ( false === $original ) {

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return;

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}

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$redirect = $original;

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$redirect_url = false;

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$redirect_obj = false;

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// Notice fixing.

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if ( ! isset( $redirect['path'] ) ) {

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$redirect['path'] = '';

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}

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if ( ! isset( $redirect['query'] ) ) {

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$redirect['query'] = '';

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}

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/*

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* If the original URL ended with non-breaking spaces, they were almost

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* certainly inserted by accident. Let's remove them, so the reader doesn't

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* see a 404 error with no obvious cause.

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*/

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$redirect['path'] = preg_replace( '|(%C2%A0)+$|i', '', $redirect['path'] );

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// It's not a preview, so remove it from URL.

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if ( get_query_var( 'preview' ) ) {

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

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}

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$post_id = get_query_var( 'p' );

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if ( is_feed() && $post_id ) {

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$redirect_url = get_post_comments_feed_link( $post_id, get_query_var( 'feed' ) );

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$redirect_obj = get_post( $post_id );

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if ( $redirect_url ) {

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$redirect['query'] = _remove_qs_args_if_not_in_url(

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$redirect['query'],

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array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type', 'feed' ),

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$redirect_url

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);

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

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}

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}

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

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

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

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$vars = $vars[0];

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

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$post_id = $vars->post_parent;

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}

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$redirect_url = get_permalink( $post_id );

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$redirect_obj = get_post( $post_id );

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if ( $redirect_url ) {

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$redirect['query'] = _remove_qs_args_if_not_in_url(

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$redirect['query'],

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array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ),

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$redirect_url

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);

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}

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}

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}

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// These tests give us a WP-generated permalink.

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if ( is_404() ) {

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// Redirect ?page_id, ?p=, ?attachment_id= to their respective URLs.

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$post_id = max( get_query_var( 'p' ), get_query_var( 'page_id' ), get_query_var( 'attachment_id' ) );

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

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if ( $redirect_post ) {

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

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if ( $post_type_obj && $post_type_obj->public && 'auto-draft' !== $redirect_post->post_status ) {

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$redirect_url = get_permalink( $redirect_post );

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$redirect_obj = get_post( $redirect_post );

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$redirect['query'] = _remove_qs_args_if_not_in_url(

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$redirect['query'],

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array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ),

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$redirect_url

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);

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}

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}

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$year = get_query_var( 'year' );

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$month = get_query_var( 'monthnum' );

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$day = get_query_var( 'day' );

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if ( $year && $month && $day ) {

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

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if ( ! wp_checkdate( $month, $day, $year, $date ) ) {

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$redirect_url = get_month_link( $year, $month );

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$redirect['query'] = _remove_qs_args_if_not_in_url(

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$redirect['query'],

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array( 'year', 'monthnum', 'day' ),

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$redirect_url

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);

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}

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} elseif ( $year && $month && $month > 12 ) {

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$redirect_url = get_year_link( $year );

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$redirect['query'] = _remove_qs_args_if_not_in_url(

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$redirect['query'],

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array( 'year', 'monthnum' ),

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$redirect_url

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);

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}

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// Strip off non-existing <!--nextpage--> links from single posts or pages.

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if ( get_query_var( 'page' ) ) {

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$post_id = 0;

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if ( $wp_query->queried_object instanceof WP_Post ) {

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$post_id = $wp_query->queried_object->ID;

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} elseif ( $wp_query->post ) {

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$post_id = $wp_query->post->ID;

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}

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if ( $post_id ) {

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$redirect_url = get_permalink( $post_id );

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$redirect_obj = get_post( $post_id );

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

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

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}

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}

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if ( ! $redirect_url ) {

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$redirect_url = redirect_guess_404_permalink();

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if ( $redirect_url ) {

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$redirect['query'] = _remove_qs_args_if_not_in_url(

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$redirect['query'],

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array( 'page', 'feed', 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ),

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$redirect_url

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);

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}

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}

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} elseif ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) {

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// Rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101.

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if ( is_attachment()

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&& ! array_diff( array_keys( $wp->query_vars ), array( 'attachment', 'attachment_id' ) )

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&& ! $redirect_url

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) {

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if ( ! empty( $_GET['attachment_id'] ) ) {

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$redirect_url = get_attachment_link( get_query_var( 'attachment_id' ) );

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$redirect_obj = get_post( get_query_var( 'attachment_id' ) );

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if ( $redirect_url ) {

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

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}

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} else {

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$redirect_url = get_attachment_link();

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$redirect_obj = get_post();

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}

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} elseif ( is_single() && ! empty( $_GET['p'] ) && ! $redirect_url ) {

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$redirect_url = get_permalink( get_query_var( 'p' ) );

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$redirect_obj = get_post( get_query_var( 'p' ) );

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if ( $redirect_url ) {

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$redirect['query'] = remove_query_arg( array( 'p', 'post_type' ), $redirect['query'] );

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}

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} elseif ( is_single() && ! empty( $_GET['name'] ) && ! $redirect_url ) {

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$redirect_url = get_permalink( $wp_query->get_queried_object_id() );

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$redirect_obj = get_post( $wp_query->get_queried_object_id() );

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if ( $redirect_url ) {

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

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}

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} elseif ( is_page() && ! empty( $_GET['page_id'] ) && ! $redirect_url ) {

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$redirect_url = get_permalink( get_query_var( 'page_id' ) );

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$redirect_obj = get_post( get_query_var( 'page_id' ) );

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if ( $redirect_url ) {

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

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}

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} elseif ( is_page() && ! is_feed() && ! $redirect_url

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&& 'page' === get_option( 'show_on_front' ) && get_queried_object_id() === (int) get_option( 'page_on_front' )

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) {

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$redirect_url = home_url( '/' );

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} elseif ( is_home() && ! empty( $_GET['page_id'] ) && ! $redirect_url

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&& 'page' === get_option( 'show_on_front' ) && get_query_var( 'page_id' ) === (int) get_option( 'page_for_posts' )

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) {

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$redirect_url = get_permalink( get_option( 'page_for_posts' ) );

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$redirect_obj = get_post( get_option( 'page_for_posts' ) );

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if ( $redirect_url ) {

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

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}

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} elseif ( ! empty( $_GET['m'] ) && ( is_year() || is_month() || is_day() ) ) {

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$m = get_query_var( 'm' );

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switch ( strlen( $m ) ) {

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case 4: // Yearly.

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$redirect_url = get_year_link( $m );

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break;

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case 6: // Monthly.

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$redirect_url = get_month_link( substr( $m, 0, 4 ), substr( $m, 4, 2 ) );

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break;

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case 8: // Daily.

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$redirect_url = get_day_link( substr( $m, 0, 4 ), substr( $m, 4, 2 ), substr( $m, 6, 2 ) );

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break;

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}

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if ( $redirect_url ) {

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

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}

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// Now moving on to non ?m=X year/month/day links.

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} elseif ( is_date() ) {

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$year = get_query_var( 'year' );

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$month = get_query_var( 'monthnum' );

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$day = get_query_var( 'day' );

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if ( is_day() && $year && $month && ! empty( $_GET['day'] ) ) {

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$redirect_url = get_day_link( $year, $month, $day );

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if ( $redirect_url ) {

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$redirect['query'] = remove_query_arg( array( 'year', 'monthnum', 'day' ), $redirect['query'] );

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}

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} elseif ( is_month() && $year && ! empty( $_GET['monthnum'] ) ) {

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$redirect_url = get_month_link( $year, $month );

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if ( $redirect_url ) {

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$redirect['query'] = remove_query_arg( array( 'year', 'monthnum' ), $redirect['query'] );

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}

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} elseif ( is_year() && ! empty( $_GET['year'] ) ) {

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$redirect_url = get_year_link( $year );

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if ( $redirect_url ) {

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

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}

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}

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} elseif ( is_author() && ! empty( $_GET['author'] ) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) {

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$author = get_userdata( get_query_var( 'author' ) );

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if ( false !== $author

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&& $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 ) )

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) {

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$redirect_url = get_author_posts_url( $author->ID, $author->user_nicename );

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$redirect_obj = $author;

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if ( $redirect_url ) {

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

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}

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}

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} elseif ( is_category() || is_tag() || is_tax() ) { // Terms (tags/categories).

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$term_count = 0;

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foreach ( $wp_query->tax_query->queried_terms as $tax_query ) {

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$term_count += count( $tax_query['terms'] );

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}

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$obj = $wp_query->get_queried_object();

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if ( $term_count <= 1 && ! empty( $obj->term_id ) ) {

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$tax_url = get_term_link( (int) $obj->term_id, $obj->taxonomy );

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if ( $tax_url && ! is_wp_error( $tax_url ) ) {

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if ( ! empty( $redirect['query'] ) ) {

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// Strip taxonomy query vars off the URL.

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$qv_remove = array( 'term', 'taxonomy' );

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if ( is_category() ) {

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$qv_remove[] = 'category_name';

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$qv_remove[] = 'cat';

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} elseif ( is_tag() ) {

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$qv_remove[] = 'tag';

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$qv_remove[] = 'tag_id';

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} else {

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// Custom taxonomies will have a custom query var, remove those too.

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$tax_obj = get_taxonomy( $obj->taxonomy );

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if ( false !== $tax_obj->query_var ) {

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$qv_remove[] = $tax_obj->query_var;

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}

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}

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

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// Check to see if all the query vars are coming from the rewrite, none are set via $_GET.

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if ( ! array_diff( $rewrite_vars, array_keys( $_GET ) ) ) {

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// Remove all of the per-tax query vars.

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

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// Create the destination URL for this taxonomy.

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$tax_url = parse_url( $tax_url );

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if ( ! empty( $tax_url['query'] ) ) {

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// Taxonomy accessible via ?taxonomy=...&term=... or any custom query var.

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parse_str( $tax_url['query'], $query_vars );

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$redirect['query'] = add_query_arg( $query_vars, $redirect['query'] );

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} else {

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// Taxonomy is accessible via a "pretty URL".

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$redirect['path'] = $tax_url['path'];

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}

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} else {

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// Some query vars are set via $_GET. Unset those from $_GET that exist via the rewrite.

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foreach ( $qv_remove as $_qv ) {

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if ( isset( $rewrite_vars[ $_qv ] ) ) {

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

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}

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}

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}

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}

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}

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}

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} elseif ( is_single() && strpos( $wp_rewrite->permalink_structure, '%category%' ) !== false ) {

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$category_name = get_query_var( 'category_name' );

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if ( $category_name ) {

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$category = get_category_by_path( $category_name );

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if ( ! $category || is_wp_error( $category )

[395] Fix | Delete

|| ! has_term( $category->term_id, 'category', $wp_query->get_queried_object_id() )

[396] Fix | Delete

) {

[397] Fix | Delete

$redirect_url = get_permalink( $wp_query->get_queried_object_id() );

[398] Fix | Delete

$redirect_obj = get_post( $wp_query->get_queried_object_id() );

[399] Fix | Delete

}

[400] Fix | Delete

}

[401] Fix | Delete

}

[402] Fix | Delete

[403] Fix | Delete

// Post paging.

[404] Fix | Delete

if ( is_singular() && get_query_var( 'page' ) ) {

[405] Fix | Delete

$page = get_query_var( 'page' );

[406] Fix | Delete

[407] Fix | Delete

if ( ! $redirect_url ) {

[408] Fix | Delete

$redirect_url = get_permalink( get_queried_object_id() );

[409] Fix | Delete

$redirect_obj = get_post( get_queried_object_id() );

[410] Fix | Delete

}

[411] Fix | Delete

[412] Fix | Delete

if ( $page > 1 ) {

[413] Fix | Delete

$redirect_url = trailingslashit( $redirect_url );

[414] Fix | Delete

[415] Fix | Delete

if ( is_front_page() ) {

[416] Fix | Delete

$redirect_url .= user_trailingslashit( "$wp_rewrite->pagination_base/$page", 'paged' );

[417] Fix | Delete

} else {

[418] Fix | Delete

$redirect_url .= user_trailingslashit( $page, 'single_paged' );

[419] Fix | Delete

}

[420] Fix | Delete

}

[421] Fix | Delete

[422] Fix | Delete

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

[423] Fix | Delete

}

[424] Fix | Delete

[425] Fix | Delete

if ( get_query_var( 'sitemap' ) ) {

[426] Fix | Delete

$redirect_url = get_sitemap_url( get_query_var( 'sitemap' ), get_query_var( 'sitemap-subtype' ), get_query_var( 'paged' ) );

[427] Fix | Delete

$redirect['query'] = remove_query_arg( array( 'sitemap', 'sitemap-subtype', 'paged' ), $redirect['query'] );

[428] Fix | Delete

} elseif ( get_query_var( 'paged' ) || is_feed() || get_query_var( 'cpage' ) ) {

[429] Fix | Delete

// Paging and feeds.

[430] Fix | Delete

$paged = get_query_var( 'paged' );

[431] Fix | Delete

$feed = get_query_var( 'feed' );

[432] Fix | Delete

$cpage = get_query_var( 'cpage' );

[433] Fix | Delete

[434] Fix | Delete

while ( preg_match( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", $redirect['path'] )

[435] Fix | Delete

|| preg_match( '#/(comments/?)?(feed|rss2?|rdf|atom)(/+)?$#', $redirect['path'] )

[436] Fix | Delete

|| preg_match( "#/{$wp_rewrite->comments_pagination_base}-[0-9]+(/+)?$#", $redirect['path'] )

[437] Fix | Delete

) {

[438] Fix | Delete

// Strip off any existing paging.

[439] Fix | Delete

$redirect['path'] = preg_replace( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", '/', $redirect['path'] );

[440] Fix | Delete

// Strip off feed endings.

[441] Fix | Delete

$redirect['path'] = preg_replace( '#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path'] );

[442] Fix | Delete

// Strip off any existing comment paging.

[443] Fix | Delete

$redirect['path'] = preg_replace( "#/{$wp_rewrite->comments_pagination_base}-[0-9]+?(/+)?$#", '/', $redirect['path'] );

[444] Fix | Delete

}

[445] Fix | Delete

[446] Fix | Delete

$addl_path = '';

[447] Fix | Delete

$default_feed = get_default_feed();

[448] Fix | Delete

[449] Fix | Delete

if ( is_feed() && in_array( $feed, $wp_rewrite->feeds, true ) ) {

[450] Fix | Delete

$addl_path = ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '';

[451] Fix | Delete

[452] Fix | Delete

if ( ! is_singular() && get_query_var( 'withcomments' ) ) {

[453] Fix | Delete

$addl_path .= 'comments/';

[454] Fix | Delete

}

[455] Fix | Delete

[456] Fix | Delete

if ( ( 'rss' === $default_feed && 'feed' === $feed ) || 'rss' === $feed ) {

[457] Fix | Delete

$format = ( 'rss2' === $default_feed ) ? '' : 'rss2';

[458] Fix | Delete

} else {

[459] Fix | Delete

$format = ( $default_feed === $feed || 'feed' === $feed ) ? '' : $feed;

[460] Fix | Delete

}

[461] Fix | Delete

[462] Fix | Delete

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

[463] Fix | Delete

[464] Fix | Delete

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

[465] Fix | Delete

} elseif ( is_feed() && 'old' === $feed ) {

[466] Fix | Delete

$old_feed_files = array(

[467] Fix | Delete

'wp-atom.php' => 'atom',

[468] Fix | Delete

'wp-commentsrss2.php' => 'comments_rss2',

[469] Fix | Delete

'wp-feed.php' => $default_feed,

[470] Fix | Delete

'wp-rdf.php' => 'rdf',

[471] Fix | Delete

'wp-rss.php' => 'rss2',

[472] Fix | Delete

'wp-rss2.php' => 'rss2',

[473] Fix | Delete

);

[474] Fix | Delete

[475] Fix | Delete

if ( isset( $old_feed_files[ basename( $redirect['path'] ) ] ) ) {

[476] Fix | Delete

$redirect_url = get_feed_link( $old_feed_files[ basename( $redirect['path'] ) ] );

[477] Fix | Delete

[478] Fix | Delete

wp_redirect( $redirect_url, 301 );

[479] Fix | Delete

die();

[480] Fix | Delete

}

[481] Fix | Delete

}

[482] Fix | Delete

[483] Fix | Delete

if ( $paged > 0 ) {

[484] Fix | Delete

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

[485] Fix | Delete

[486] Fix | Delete

if ( ! is_feed() ) {

[487] Fix | Delete

if ( ! is_single() ) {

[488] Fix | Delete

$addl_path = ! empty( $addl_path ) ? trailingslashit( $addl_path ) : '';

[489] Fix | Delete

[490] Fix | Delete

if ( $paged > 1 ) {

[491] Fix | Delete

$addl_path .= user_trailingslashit( "$wp_rewrite->pagination_base/$paged", 'paged' );

[492] Fix | Delete

}

[493] Fix | Delete

}

[494] Fix | Delete

} elseif ( $paged > 1 ) {

[495] Fix | Delete

$redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );

[496] Fix | Delete

}

[497] Fix | Delete

}

[498] Fix | Delete

[499] Fix | Delete