| <?php |
| // Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference" by Mark Jaquith |
| |
| function redirect_canonical($requested_url=NULL, $do_redirect=true) { |
| global $wp_rewrite, $posts, $is_IIS; |
| |
| if ( is_feed() || is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() ) |
| return; |
| |
| if ( !$requested_url ) { |
| // build the URL in the address bar |
| $requested_url = ( isset($_SERVER['HTTPS'] ) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://'; |
| $requested_url .= $_SERVER['HTTP_HOST']; |
| $requested_url .= $_SERVER['REQUEST_URI']; |
| } |
| |
| $original = @parse_url($requested_url); |
| if ( false === $original ) |
| return; |
| |
| // Some PHP setups turn requests for / into /index.php in REQUEST_URI |
| $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']); |
| |
| $redirect = $original; |
| $redirect_url = false; |
| |
| // These tests give us a WP-generated permalink |
| if ( is_404() ) { |
| $redirect_url = redirect_guess_404_permalink(); |
| } elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) { |
| // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101 |
| if ( is_single() && isset($_GET['p']) ) { |
| if ( $redirect_url = get_permalink(get_query_var('p')) ) |
| $redirect['query'] = remove_query_arg('p', $redirect['query']); |
| } elseif ( is_page() && isset($_GET['page_id']) ) { |
| if ( $redirect_url = get_permalink(get_query_var('page_id')) ) |
| $redirect['query'] = remove_query_arg('page_id', $redirect['query']); |
| } elseif ( isset($_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', $redirect['query']); |
| // now moving on to non ?m=X year/month/day links |
| } elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && isset($_GET['day']) ) { |
| if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) ) |
| $redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']); |
| } elseif ( is_month() && get_query_var('year') && isset($_GET['monthnum']) ) { |
| if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) ) |
| $redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']); |
| } elseif ( is_year() && isset($_GET['year']) ) { |
| if ( $redirect_url = get_year_link(get_query_var('year')) ) |
| $redirect['query'] = remove_query_arg('year', $redirect['query']); |
| } elseif ( is_category() && isset($_GET['cat']) ) { |
| if ( $redirect_url = get_category_link(get_query_var('cat')) ) |
| $redirect['query'] = remove_query_arg('cat', $redirect['query']); |
| } elseif ( is_author() && isset($_GET['author']) ) { |
| $author = get_userdata(get_query_var('author')); |
| if ( false !== $author && $redirect_url = get_author_link(false, $author->ID, $author->user_nicename) ) |
| $redirect['query'] = remove_query_arg('author', $redirect['author']); |
| } |
| |
| // paging |
| if ( $paged = get_query_var('paged') ) { |
| if ( $paged > 0 ) { |
| if ( !$redirect_url ) |
| $redirect_url = $requested_url; |
| $paged_redirect = @parse_url($redirect_url); |
| $paged_redirect['path'] = preg_replace('|/page/[0-9]+?(/+)?$|', '/', $paged_redirect['path']); // strip off any existing paging |
| $paged_redirect['path'] = preg_replace('|/index.php/?$|', '/', $paged_redirect['path']); // strip off trailing /index.php/ |
| if ( $paged > 1 && !is_single() ) { |
| $paged_redirect['path'] = trailingslashit($paged_redirect['path']); |
| if ( $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false ) |
| $paged_redirect['path'] .= 'index.php/'; |
| $paged_redirect['path'] .= user_trailingslashit("page/$paged", 'paged'); |
| } elseif ( !is_home() && !is_single() ){ |
| $paged_redirect['path'] = user_trailingslashit($paged_redirect['path'], 'paged'); |
| } |
| $redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path']; |
| $redirect['path'] = $paged_redirect['path']; |
| } |
| $redirect['query'] = remove_query_arg('paged', $redirect['query']); |
| } |
| } |
| |
| // tack on any additional query vars |
| if ( $redirect_url && $redirect['query'] ) { |
| if ( strpos($redirect_url, '?') !== false ) |
| $redirect_url .= '&'; |
| else |
| $redirect_url .= '?'; |
| $redirect_url .= $redirect['query']; |
| } |
| |
| if ( $redirect_url ) |
| $redirect = @parse_url($redirect_url); |
| |
| // www.example.com vs example.com |
| $user_home = @parse_url(get_option('home')); |
| $redirect['host'] = $user_home['host']; |
| |
| // Handle ports |
| if ( isset($user_home['port']) ) |
| $redirect['port'] = $user_home['port']; |
| else |
| unset($redirect['port']); |
| |
| // trailing /index.php/ |
| $redirect['path'] = preg_replace('|/index.php/$|', '/', $redirect['path']); |
| |
| // strip /index.php/ when we're not using PATHINFO permalinks |
| if ( !$wp_rewrite->using_index_permalinks() ) |
| $redirect['path'] = str_replace('/index.php/', '/', $redirect['path']); |
| |
| // trailing slashes |
| if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_home() || ( is_home() && (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') 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_home() ) { |
| $redirect['path'] = trailingslashit($redirect['path']); |
| } |
| |
| // Always trailing slash the 'home' URL |
| if ( $redirect['path'] == $user_home['path'] ) |
| $redirect['path'] = trailingslashit($redirect['path']); |
| |
| // Ignore differences in host capitalization, as this can lead to infinite redirects |
| if ( strtolower($original['host']) == strtolower($redirect['host']) ) |
| $redirect['host'] = $original['host']; |
| |
| if ( array($original['host'], $original['port'], $original['path'], $original['query']) !== array($redirect['host'], $redirect['port'], $redirect['path'], $redirect['query']) ) { |
| $redirect_url = $redirect['scheme'] . '://' . $redirect['host']; |
| if ( isset($redirect['port']) ) |
| $redirect_url .= ':' . $redirect['port']; |
| $redirect_url .= $redirect['path']; |
| if ( $redirect['query'] ) |
| $redirect_url .= '?' . $redirect['query']; |
| } |
| |
| if ( $redirect_url && $redirect_url != $requested_url ) { |
| // var_dump($redirect_url); die(); |
| $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); |
| if ( $do_redirect) { |
| // protect against chained redirects |
| if ( !redirect_canonical($redirect_url, false) ) { |
| wp_redirect($redirect_url, 301); |
| exit(); |
| } else { |
| return false; |
| } |
| } else { |
| return $redirect_url; |
| } |
| } else { |
| return false; |
| } |
| } |
| |
| function redirect_guess_404_permalink() { |
| global $wp_query, $wpdb; |
| if ( !get_query_var('name') ) |
| return false; |
| |
| $where = "post_name LIKE '" . $wpdb->escape(get_query_var('name')) . "%'"; |
| |
| // if any of year, monthnum, or day are set, use them to refine the query |
| if ( get_query_var('year') ) |
| $where .= " AND YEAR(post_date) = '" . $wpdb->escape(get_query_var('year')) . "'"; |
| if ( get_query_var('monthnum') ) |
| $where .= " AND MONTH(post_date) = '" . $wpdb->escape(get_query_var('monthnum')) . "'"; |
| if ( get_query_var('day') ) |
| $where .= " AND DAYOFMONTH(post_date) = '" . $wpdb->escape(get_query_var('day')) . "'"; |
| |
| $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'"); |
| if ( !$post_id ) |
| return false; |
| return get_permalink($post_id); |
| } |
| |
| add_action('template_redirect', 'redirect_canonical'); |
| |
| ?> |