/**
* 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 penality for duplicate content by redirecting all incoming links to
* one or the other.
*
* Prevents redirection for feeds, trackbacks, searches, comment popup, and
* admin URLs. Does not redirect on IIS, page/post previews, and on form data.
*
* 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.
*
* @since 2.3.0
* @uses $wp_rewrite
* @uses $is_IIS
*
* @param string $requested_url Optional. The URL that was requested, used to
* figure if redirect is needed.
* @param bool $do_redirect Optional. Redirect to the new URL.
* @return null|false|string Null, if redirect not needed. False, if redirect
* not needed or the string of the URL
*/
function redirect_canonical($requested_url = null, $do_redirect = true)
{
global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
if (is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || isset($_POST) && count($_POST) || is_preview() || is_robots()) {
return;
}
if (!$requested_url) {
// 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;
}
// Some PHP setups turn requests for / into /index.php in REQUEST_URI
// See: http://trac.wordpress.org/ticket/5017
// See: http://trac.wordpress.org/ticket/7173
// Disabled, for now:
// $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']);
$redirect = $original;
$redirect_url = false;
// Notice fixing
if (!isset($redirect['path'])) {
$redirect['path'] = '';
}
if (!isset($redirect['query'])) {
$redirect['query'] = '';
}
if (is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p'))) {
$vars = $wpdb->get_results($wpdb->prepare("SELECT post_type, post_parent FROM {$wpdb->posts} WHERE ID = %d", $id));
if (isset($vars[0]) && ($vars = $vars[0])) {
if ('revision' == $vars->post_type && $vars->post_parent > 0) {
$id = $vars->post_parent;
}
if ($redirect_url = get_permalink($id)) {
$redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id', 'post_type'), $redirect['query']);
}
}
}
// These tests give us a WP-generated permalink
if (is_404()) {
// Redirect ?page_id, ?p=, ?attachment_id= to their respective url's
$id = max(get_query_var('p'), get_query_var('page_id'), get_query_var('attachment_id'));
if ($id && ($redirect_post = get_post($id))) {
$post_type_obj = get_post_type_object($redirect_post->post_type);
if ($post_type_obj->public) {
$redirect_url = get_permalink($redirect_post);
$redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id', 'post_type'), $redirect['query']);
}
}
if (!$redirect_url) {
$redirect_url = redirect_guess_404_permalink();
}
} elseif (is_object($wp_rewrite) && $wp_rewrite->using_permalinks()) {
// rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
if (is_attachment() && !empty($_GET['attachment_id']) && !$redirect_url) {
if ($redirect_url = get_attachment_link(get_query_var('attachment_id'))) {
$redirect['query'] = remove_query_arg('attachment_id', $redirect['query']);
}
} elseif (is_single() && !empty($_GET['p']) && !$redirect_url) {
if ($redirect_url = get_permalink(get_query_var('p'))) {
$redirect['query'] = remove_query_arg(array('p', 'post_type'), $redirect['query']);
}
if (get_query_var('page')) {
$redirect_url = trailingslashit($redirect_url) . user_trailingslashit(get_query_var('page'), 'single_paged');
$redirect['query'] = remove_query_arg('page', $redirect['query']);
}
} elseif (is_single() && !empty($_GET['name']) && !$redirect_url) {
if ($redirect_url = get_permalink($wp_query->get_queried_object_id())) {
$redirect['query'] = remove_query_arg('name', $redirect['query']);
}
} elseif (is_page() && !empty($_GET['page_id']) && !$redirect_url) {
if ($redirect_url = get_permalink(get_query_var('page_id'))) {
$redirect['query'] = remove_query_arg('page_id', $redirect['query']);
}
} elseif (is_page() && !is_feed() && isset($wp_query->queried_object) && 'page' == get_option('show_on_front') && $wp_query->queried_object->ID == get_option('page_on_front') && !$redirect_url) {
$redirect_url = home_url('/');
} elseif (is_home() && !empty($_GET['page_id']) && 'page' == get_option('show_on_front') && get_query_var('page_id') == get_option('page_for_posts') && !$redirect_url) {
if ($redirect_url = get_permalink(get_option('page_for_posts'))) {
$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', $redirect['query']);
}
// now moving on to non ?m=X year/month/day links
} elseif (is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_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'), $redirect['query']);
}
} elseif (is_month() && get_query_var('year') && !empty($_GET['monthnum'])) {
if ($redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum'))) {
$redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
}
} elseif (is_year() && !empty($_GET['year'])) {
if ($redirect_url = get_year_link(get_query_var('year'))) {
$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 !== $author && ($redirect_url = get_author_posts_url($author->ID, $author->user_nicename))) {
$redirect['query'] = remove_query_arg('author', $redirect['query']);
}
} elseif (is_category() || is_tag() || is_tax()) {
// Terms (Tags/categories)
$term_count = 0;
foreach (array('category__in', 'category__not_in', 'category__and', 'post__in', 'post__not_in', 'tag__in', 'tag__not_in', 'tag__and', 'tag_slug__in', 'tag_slug__and') as $key) {
$term_count += count($wp_query->query_vars[$key]);
}
$obj = $wp_query->get_queried_object();
if ($term_count <= 1 && !empty($obj->term_id) && ($tax_url = get_term_link((int) $obj->term_id, $obj->taxonomy)) && !is_wp_error($tax_url)) {
if (is_category()) {
$redirect['query'] = remove_query_arg(array('category_name', 'category', 'cat'), $redirect['query']);
} elseif (is_tag()) {
$redirect['query'] = remove_query_arg(array('tag', 'tag_id'), $redirect['query']);
} elseif (is_tax()) {
// Custom taxonomies will have a custom query var, remove those too:
$tax = get_taxonomy($obj->taxonomy);
if (false !== $tax->query_var) {
$redirect['query'] = remove_query_arg($tax->query_var, $redirect['query']);
} else {
$redirect['query'] = remove_query_arg(array('term', 'taxonomy'), $redirect['query']);
}
}
$tax_url = parse_url($tax_url);
if (!empty($tax_url['query'])) {
// Custom taxonomies may only be accessable via ?taxonomy=..&term=..
parse_str($tax_url['query'], $query_vars);
$redirect['query'] = add_query_arg($query_vars, $redirect['query']);
} else {
// Taxonomy is accessable via a "pretty-URL"
$redirect['path'] = $tax_url['path'];
}
}
} elseif (is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false) {
$category = get_term_by('slug', get_query_var('category_name'), 'category');
$post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
if (!$category || is_wp_error($category) || !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms)) {
$redirect_url = get_permalink($wp_query->get_queried_object_id());
}
}
// paging and feeds
if (get_query_var('paged') || is_feed() || get_query_var('cpage')) {
if (!$redirect_url) {
$redirect_url = $requested_url;
}
$paged_redirect = @parse_url($redirect_url);
while (preg_match('#/page/?[0-9]+?(/+)?$#', $paged_redirect['path']) || preg_match('#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $paged_redirect['path']) || preg_match('#/comment-page-[0-9]+(/+)?$#', $paged_redirect['path'])) {
// Strip off paging and feed
$paged_redirect['path'] = preg_replace('#/page/?[0-9]+?(/+)?$#', '/', $paged_redirect['path']);
// strip off any existing paging
$paged_redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $paged_redirect['path']);
// strip off feed endings
$paged_redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $paged_redirect['path']);
// strip off any existing comment paging
}
$addl_path = '';
if (is_feed()) {
$addl_path = !empty($addl_path) ? trailingslashit($addl_path) : '';
if (get_query_var('withcomments')) {
$addl_path .= 'comments/';
}
$addl_path .= user_trailingslashit('feed/' . (get_default_feed() == get_query_var('feed') || 'feed' == get_query_var('feed') ? '' : get_query_var('feed')), 'feed');
$redirect['query'] = remove_query_arg('feed', $redirect['query']);
}
if (get_query_var('paged') > 0) {
$paged = get_query_var('paged');
$redirect['query'] = remove_query_arg('paged', $redirect['query']);
if (!is_feed()) {
if ($paged > 1 && !is_single()) {
$addl_path = (!empty($addl_path) ? trailingslashit($addl_path) : '') . user_trailingslashit("page/{$paged}", 'paged');
} elseif (!is_single()) {
$addl_path = !empty($addl_path) ? trailingslashit($addl_path) : '';
}
} elseif ($paged > 1) {
$redirect['query'] = add_query_arg('paged', $paged, $redirect['query']);
}
}
if (get_option('page_comments') && ('newest' == get_option('default_comments_page') && get_query_var('cpage') > 0 || 'newest' != get_option('default_comments_page') && get_query_var('cpage') > 1)) {
$addl_path = (!empty($addl_path) ? trailingslashit($addl_path) : '') . user_trailingslashit('comment-page-' . get_query_var('cpage'), 'commentpaged');
$redirect['query'] = remove_query_arg('cpage', $redirect['query']);
}
$paged_redirect['path'] = user_trailingslashit(preg_replace('|/index.php/?$|', '/', $paged_redirect['path']));
// strip off trailing /index.php/
if (!empty($addl_path) && $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false) {
$paged_redirect['path'] = trailingslashit($paged_redirect['path']) . 'index.php/';
}
if (!empty($addl_path)) {
$paged_redirect['path'] = trailingslashit($paged_redirect['path']) . $addl_path;
}
$redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path'];
$redirect['path'] = $paged_redirect['path'];
}
}
// tack on any additional query vars
$redirect['query'] = preg_replace('#^\\??&*?#', '', $redirect['query']);
if ($redirect_url && !empty($redirect['query'])) {
if (strpos($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
$user_home = @parse_url(home_url());
if (!empty($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
$redirect['path'] = preg_replace('|/index.php/*?$|', '/', $redirect['path']);
// Remove trailing spaces from the path
$redirect['path'] = preg_replace('#(%20| )+$#', '', $redirect['path']);
if (!empty($redirect['query'])) {
// Remove trailing spaces from certain terminating query string args
$redirect['query'] = preg_replace('#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$1', $redirect['query']);
// Clean up empty query strings
$redirect['query'] = trim(preg_replace('#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $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('/index.php/', '/', $redirect['path']);
}
// trailing slashes
if (is_object($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']);
}
// 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']);
}
// Ignore differences in host capitalization, as this can lead to infinite redirects
// Only redirect no-www <=> yes-www
if (strtolower($original['host']) == strtolower($redirect['host']) || strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host'])) {
$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 false;
}
// Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE
$redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url);
if (!$redirect_url || $redirect_url == $requested_url) {
// yes, again -- in case the filter aborted the request
return false;
}
if ($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 false;
}
} else {
return $redirect_url;
}
}
/**
* 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 penality for duplicate content by redirecting all incoming links to
* one or the other.
*
* Prevents redirection for feeds, trackbacks, searches, comment popup, and
* admin URLs. Does not redirect on IIS, page/post previews, and on form data.
*
* 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.
*
* @since 2.3.0
* @uses $wp_rewrite
* @uses $is_IIS
*
* @param string $requested_url Optional. The URL that was requested, used to
* figure if redirect is needed.
* @param bool $do_redirect Optional. Redirect to the new URL.
* @return null|false|string Null, if redirect not needed. False, if redirect
* not needed or the string of the URL
*/
function redirect_canonical($requested_url=null, $do_redirect=true) {
global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() || is_robots() )
return;
if ( !$requested_url ) {
// build the URL in the address bar
$requested_url = ( !empty($_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
// See: http://trac.wordpress.org/ticket/5017
// See: http://trac.wordpress.org/ticket/7173
// Disabled, for now:
// $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']);
$redirect = $original;
$redirect_url = false;
// Notice fixing
if ( !isset($redirect['path']) ) $redirect['path'] = '';
if ( !isset($redirect['query']) ) $redirect['query'] = '';
if ( is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) {
$vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) );
if ( isset($vars[0]) && $vars = $vars[0] ) {
if ( 'revision' == $vars->post_type && $vars->post_parent > 0 )
$id = $vars->post_parent;
if ( $redirect_url = get_permalink($id) )
$redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id'), $redirect['query']);
}
}
// These tests give us a WP-generated permalink
if ( is_404() ) {
$redirect_url = redirect_guess_404_permalink();
} elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) {
// rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
if ( is_single() && !empty($_GET['p']) && ! $redirect_url ) {
if ( $redirect_url = get_permalink(get_query_var('p')) )
$redirect['query'] = remove_query_arg('p', $redirect['query']);
if ( get_query_var( 'page' ) ) {
$redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
$redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
}
} elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) {
if ( $redirect_url = get_permalink(get_query_var('page_id')) )
$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', $redirect['query']);
// now moving on to non ?m=X year/month/day links
} elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_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'), $redirect['query']);
} elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) {
if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) )
$redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
} elseif ( is_year() && !empty($_GET['year']) ) {
if ( $redirect_url = get_year_link(get_query_var('year')) )
$redirect['query'] = remove_query_arg('year', $redirect['query']);
} elseif ( is_category() && !empty($_GET['cat']) ) {
if ( $redirect_url = get_category_link(get_query_var('cat')) )
$redirect['query'] = remove_query_arg('cat', $redirect['query']);
} elseif ( is_author() && !empty($_GET['author']) ) {
$author = get_userdata(get_query_var('author'));
if ( false !== $author && $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) )
$redirect['query'] = remove_query_arg('author', $redirect['author']);
}
// paging and feeds
if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) {
if ( !$redirect_url )
$redirect_url = $requested_url;
$paged_redirect = @parse_url($redirect_url);
while ( preg_match( '#/page/[0-9]+?(/+)?$#', $paged_redirect['path'] ) || preg_match( '#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $paged_redirect['path'] ) || preg_match( '#/comment-page-[0-9]+(/+)?$#', $paged_redirect['path'] ) ) {
// Strip off paging and feed
$paged_redirect['path'] = preg_replace('#/page/[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing paging
$paged_redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+)?$#', '/', $paged_redirect['path']); // strip off feed endings
$paged_redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing comment paging
}
$addl_path = '';
if ( is_feed() ) {
$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
if ( get_query_var( 'withcomments' ) )
$addl_path .= 'comments/';
$addl_path .= user_trailingslashit( 'feed/' . ( ( 'rss2' == get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
$redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
}
if ( get_query_var('paged') > 0 ) {
$paged = get_query_var('paged');
$redirect['query'] = remove_query_arg( 'paged', $redirect['query'] );
if ( !is_feed() ) {
if ( $paged > 1 && !is_single() ) {
$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("page/$paged", 'paged');
} elseif ( !is_single() ) {
$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit($paged_redirect['path'], 'paged');
}
} elseif ( $paged > 1 ) {
$redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );
}
}
if ( get_option('page_comments') && ( ( 'newest' == get_option('default_comments_page') && get_query_var('cpage') > 0 ) || ( 'newest' != get_option('default_comments_page') && get_query_var('cpage') > 1 ) ) ) {
$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit( 'comment-page-' . get_query_var('cpage'), 'commentpaged' );
$redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] );
}
$paged_redirect['path'] = user_trailingslashit( preg_replace('|/index.php/?$|', '/', $paged_redirect['path']) ); // strip off trailing /index.php/
if ( !empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false )
$paged_redirect['path'] = trailingslashit($paged_redirect['path']) . 'index.php/';
if ( !empty( $addl_path ) )
$paged_redirect['path'] = trailingslashit($paged_redirect['path']) . $addl_path;
$redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path'];
$redirect['path'] = $paged_redirect['path'];
}
}
// tack on any additional query vars
$redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
if ( $redirect_url && !empty($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
$user_home = @parse_url(get_option('home'));
if ( !empty($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
$redirect['path'] = preg_replace('|/index.php/*?$|', '/', $redirect['path']);
// Remove trailing spaces from the path
$redirect['path'] = preg_replace( '#(%20| )+$#', '', $redirect['path'] );
if ( !empty( $redirect['query'] ) ) {
// Remove trailing spaces from certain terminating query string args
$redirect['query'] = preg_replace( '#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$1', $redirect['query'] );
// Clean up empty query strings
$redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $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('/index.php/', '/', $redirect['path']);
// trailing slashes
if ( is_object($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']);
}
// Always trailing slash the Front Page URL
if ( trailingslashit( $redirect['path'] ) == trailingslashit( $user_home['path'] ) )
$redirect['path'] = trailingslashit($redirect['path']);
// Ignore differences in host capitalization, as this can lead to infinite redirects
// Only redirect no-www <=> yes-www
if ( strtolower($original['host']) == strtolower($redirect['host']) ||
( strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host']) ) )
$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 false;
// Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE
$redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url);
if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request
return false;
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 false;
}
} else {
return $redirect_url;
}
}
/**
* 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, comment popup, and
* admin URLs. Does not redirect on IIS, page/post previews, and on form data.
*
* 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.
*
* @since 2.3.0
* @uses $wp_rewrite
* @uses $is_IIS
*
* @param string $requested_url Optional. The URL that was requested, used to
* figure if redirect is needed.
* @param bool $do_redirect Optional. Redirect to the new URL.
* @return null|false|string Null, if redirect not needed. False, if redirect
* not needed or the string of the URL
*/
function redirect_canonical( $requested_url = null, $do_redirect = true ) {
global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || !empty($_POST) || is_preview() || is_robots() || $is_IIS )
return;
if ( !$requested_url ) {
// 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;
// Some PHP setups turn requests for / into /index.php in REQUEST_URI
// See: http://trac.wordpress.org/ticket/5017
// See: http://trac.wordpress.org/ticket/7173
// Disabled, for now:
// $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']);
$redirect = $original;
$redirect_url = false;
// Notice fixing
if ( !isset($redirect['path']) )
$redirect['path'] = '';
if ( !isset($redirect['query']) )
$redirect['query'] = '';
if ( is_feed() && ( $id = get_query_var( 'p' ) ) ) {
if ( $redirect_url = get_post_comments_feed_link( $id, get_query_var( 'feed' ) ) ) {
$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() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) {
$vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) );
if ( isset($vars[0]) && $vars = $vars[0] ) {
if ( 'revision' == $vars->post_type && $vars->post_parent > 0 )
$id = $vars->post_parent;
if ( $redirect_url = get_permalink($id) )
$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 url's
$id = max( get_query_var('p'), get_query_var('page_id'), get_query_var('attachment_id') );
if ( $id && $redirect_post = get_post($id) ) {
$post_type_obj = get_post_type_object($redirect_post->post_type);
if ( $post_type_obj->public ) {
$redirect_url = get_permalink($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 );
}
}
if ( ! $redirect_url ) {
if ( $redirect_url = redirect_guess_404_permalink( $requested_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) && $wp_rewrite->using_permalinks() ) {
// rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
if ( is_attachment() && !empty($_GET['attachment_id']) && ! $redirect_url ) {
if ( $redirect_url = get_attachment_link(get_query_var('attachment_id')) )
$redirect['query'] = remove_query_arg('attachment_id', $redirect['query']);
} elseif ( is_single() && !empty($_GET['p']) && ! $redirect_url ) {
if ( $redirect_url = get_permalink(get_query_var('p')) )
$redirect['query'] = remove_query_arg(array('p', 'post_type'), $redirect['query']);
} elseif ( is_single() && !empty($_GET['name']) && ! $redirect_url ) {
if ( $redirect_url = get_permalink( $wp_query->get_queried_object_id() ) )
$redirect['query'] = remove_query_arg('name', $redirect['query']);
} elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) {
if ( $redirect_url = get_permalink(get_query_var('page_id')) )
$redirect['query'] = remove_query_arg('page_id', $redirect['query']);
} elseif ( is_page() && !is_feed() && isset($wp_query->queried_object) && 'page' == get_option('show_on_front') && $wp_query->queried_object->ID == get_option('page_on_front') && ! $redirect_url ) {
$redirect_url = home_url('/');
} elseif ( is_home() && !empty($_GET['page_id']) && 'page' == get_option('show_on_front') && get_query_var('page_id') == get_option('page_for_posts') && ! $redirect_url ) {
if ( $redirect_url = get_permalink(get_option('page_for_posts')) )
$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', $redirect['query']);
// now moving on to non ?m=X year/month/day links
} elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_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'), $redirect['query']);
} elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) {
if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) )
$redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
} elseif ( is_year() && !empty($_GET['year']) ) {
if ( $redirect_url = get_year_link(get_query_var('year')) )
$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 ) ) ) {
if ( $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) )
$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->queries as $tax_query )
$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, $obj->taxonomy) ) && !is_wp_error($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($_GET) );
if ( !array_diff($rewrite_vars, array_keys($_GET)) ) { // Check to see if all the Query vars are coming from the rewrite, none are set via $_GET
$redirect['query'] = remove_query_arg($qv_remove, $redirect['query']); //Remove all of the per-tax qv's
// Create the destination url for this taxonomy
$tax_url = parse_url($tax_url);
if ( ! empty($tax_url['query']) ) { // Taxonomy accessible via ?taxonomy=..&term=.. or any custom qv..
parse_str($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 && $cat = get_query_var( 'category_name' ) ) {
$category = get_category_by_path( $cat );
$post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
if ( (!$category || is_wp_error($category)) || ( !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms) ) )
$redirect_url = get_permalink($wp_query->get_queried_object_id());
}
// Post Paging
if ( is_singular() && ! is_front_page() && get_query_var('page') ) {
if ( !$redirect_url )
$redirect_url = get_permalink( get_queried_object_id() );
$redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
$redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
}
// paging and feeds
if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) {
while ( preg_match( "#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", $redirect['path'] ) || preg_match( '#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $redirect['path'] ) || preg_match( '#/comment-page-[0-9]+(/+)?$#', $redirect['path'] ) ) {
// Strip off paging and feed
$redirect['path'] = preg_replace("#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", '/', $redirect['path']); // strip off any existing paging
$redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path']); // strip off feed endings
$redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $redirect['path']); // strip off any existing comment paging
}
$addl_path = '';
if ( is_feed() && in_array( get_query_var('feed'), $wp_rewrite->feeds ) ) {
$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
if ( !is_singular() && get_query_var( 'withcomments' ) )
$addl_path .= 'comments/';
if ( ( 'rss' == get_default_feed() && 'feed' == get_query_var('feed') ) || 'rss' == get_query_var('feed') )
$addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == 'rss2' ) ? '' : 'rss2' ), 'feed' );
else
$addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
$redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
} elseif ( is_feed() && 'old' == get_query_var('feed') ) {
$old_feed_files = array(
'wp-atom.php' => 'atom',
'wp-commentsrss2.php' => 'comments_rss2',
'wp-feed.php' => get_default_feed(),
'wp-rdf.php' => 'rdf',
'wp-rss.php' => 'rss2',
'wp-rss2.php' => 'rss2',
);
if ( isset( $old_feed_files[ basename( $redirect['path'] ) ] ) ) {
$redirect_url = get_feed_link( $old_feed_files[ basename( $redirect['path'] ) ] );
wp_redirect( $redirect_url, 301 );
die();
}
}
if ( get_query_var('paged') > 0 ) {
$paged = get_query_var('paged');
$redirect['query'] = remove_query_arg( 'paged', $redirect['query'] );
if ( !is_feed() ) {
if ( $paged > 1 && !is_single() ) {
$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("$wp_rewrite->pagination_base/$paged", 'paged');
} elseif ( !is_single() ) {
$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
}
} elseif ( $paged > 1 ) {
$redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );
}
}
if ( get_option('page_comments') && ( ( 'newest' == get_option('default_comments_page') && get_query_var('cpage') > 0 ) || ( 'newest' != get_option('default_comments_page') && get_query_var('cpage') > 1 ) ) ) {
$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit( 'comment-page-' . get_query_var('cpage'), 'commentpaged' );
$redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] );
}
$redirect['path'] = user_trailingslashit( preg_replace('|/index.php/?$|', '/', $redirect['path']) ); // strip off trailing /index.php/
if ( !empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos($redirect['path'], '/index.php/') === false )
$redirect['path'] = trailingslashit($redirect['path']) . 'index.php/';
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() )
$redirect_url = apply_filters( 'wp_signup_location', site_url( 'wp-signup.php' ) );
else
$redirect_url = site_url( 'wp-login.php?action=register' );
wp_redirect( $redirect_url, 301 );
die();
}
}
// tack on any additional query vars
$redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
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 = rawurlencode_deep( $_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
$redirect['path'] = preg_replace('|/index.php/*?$|', '/', $redirect['path']);
// Remove trailing spaces from the path
$redirect['path'] = preg_replace( '#(%20| )+$#', '', $redirect['path'] );
if ( !empty( $redirect['query'] ) ) {
// Remove trailing spaces from certain terminating query string args
$redirect['query'] = preg_replace( '#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$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$3', $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('/index.php/', '/', $redirect['path']);
// trailing slashes
if ( is_object($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']);
}
// 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']);
// Ignore differences in host capitalization, as this can lead to infinite redirects
// Only redirect no-www <=> yes-www
if ( strtolower($original['host']) == strtolower($redirect['host']) ||
( strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host']) ) )
$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 == $requested_url )
return false;
// Hex encoded octets are case-insensitive.
if ( false !== strpos($requested_url, '%') ) {
if ( !function_exists('lowercase_octets') ) {
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);
}
// Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning false
$redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url);
if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request
return false;
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 false;
}
} else {
return $redirect_url;
}
}
/**
* 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, comment popup, and
* admin URLs. Does not redirect on non-pretty-permalink-supporting IIS 7+,
* page/post previews, WP admin, Trackbacks, robots.txt, 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.
*
* @since 2.3.0
*
* @global WP_Rewrite $wp_rewrite
* @global bool $is_IIS
* @global WP_Query $wp_query
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $requested_url Optional. The URL that was requested, used to
* figure if redirect is needed.
* @param bool $do_redirect Optional. Redirect to the new URL.
* @return string|void The string of the URL, if redirect needed.
*/
function redirect_canonical($requested_url = null, $do_redirect = true)
{
global $wp_rewrite, $is_IIS, $wp_query, $wpdb, $wp;
if (isset($_SERVER['REQUEST_METHOD']) && !in_array(strtoupper($_SERVER['REQUEST_METHOD']), array('GET', 'HEAD'))) {
return;
}
// If we're not in wp-admin and the post has been published and preview nonce
// is non-existent or invalid then no need for preview in query
if (is_preview() && get_query_var('p') && 'publish' == get_post_status(get_query_var('p'))) {
if (!isset($_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_trackback() || is_search() || is_comments_popup() || is_admin() || is_preview() || is_robots() || $is_IIS && !iis7_supports_permalinks()) {
return;
}
if (!$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;
$redirect_url = false;
// Notice fixing
if (!isset($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', $redirect['query']);
}
if (is_feed() && ($id = get_query_var('p'))) {
if ($redirect_url = get_post_comments_feed_link($id, get_query_var('feed'))) {
$redirect['query'] = _remove_qs_args_if_not_in_url($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() && 1 > $wp_query->post_count && ($id = get_query_var('p'))) {
$vars = $wpdb->get_results($wpdb->prepare("SELECT post_type, post_parent FROM {$wpdb->posts} WHERE ID = %d", $id));
if (isset($vars[0]) && ($vars = $vars[0])) {
if ('revision' == $vars->post_type && $vars->post_parent > 0) {
$id = $vars->post_parent;
}
if ($redirect_url = get_permalink($id)) {
$redirect['query'] = _remove_qs_args_if_not_in_url($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 url's
$id = max(get_query_var('p'), get_query_var('page_id'), get_query_var('attachment_id'));
if ($id && ($redirect_post = get_post($id))) {
$post_type_obj = get_post_type_object($redirect_post->post_type);
if ($post_type_obj->public) {
$redirect_url = get_permalink($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);
}
}
if (get_query_var('day') && get_query_var('monthnum') && get_query_var('year')) {
$year = get_query_var('year');
$month = get_query_var('monthnum');
$day = get_query_var('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 (get_query_var('monthnum') && get_query_var('year') && 12 < get_query_var('monthnum')) {
$redirect_url = get_year_link(get_query_var('year'));
$redirect['query'] = _remove_qs_args_if_not_in_url($redirect['query'], array('year', 'monthnum'), $redirect_url);
}
if (!$redirect_url) {
if ($redirect_url = redirect_guess_404_permalink()) {
$redirect['query'] = _remove_qs_args_if_not_in_url($redirect['query'], array('page', 'feed', 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type'), $redirect_url);
}
}
if (get_query_var('page') && $wp_query->post && false !== strpos($wp_query->post->post_content, '<!--nextpage-->')) {
$redirect['path'] = rtrim($redirect['path'], (int) get_query_var('page') . '/');
$redirect['query'] = remove_query_arg('page', $redirect['query']);
$redirect_url = get_permalink($wp_query->post->ID);
}
} 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'])) {
$redirect_url = get_attachment_link(get_query_var('attachment_id'));
if ($redirect_url) {
$redirect['query'] = remove_query_arg('attachment_id', $redirect['query']);
}
} else {
$redirect_url = get_attachment_link();
}
} elseif (is_single() && !empty($_GET['p']) && !$redirect_url) {
if ($redirect_url = get_permalink(get_query_var('p'))) {
$redirect['query'] = remove_query_arg(array('p', 'post_type'), $redirect['query']);
}
} elseif (is_single() && !empty($_GET['name']) && !$redirect_url) {
if ($redirect_url = get_permalink($wp_query->get_queried_object_id())) {
$redirect['query'] = remove_query_arg('name', $redirect['query']);
}
} elseif (is_page() && !empty($_GET['page_id']) && !$redirect_url) {
if ($redirect_url = get_permalink(get_query_var('page_id'))) {
$redirect['query'] = remove_query_arg('page_id', $redirect['query']);
}
} elseif (is_page() && !is_feed() && isset($wp_query->queried_object) && 'page' == get_option('show_on_front') && $wp_query->queried_object->ID == get_option('page_on_front') && !$redirect_url) {
$redirect_url = home_url('/');
} elseif (is_home() && !empty($_GET['page_id']) && 'page' == get_option('show_on_front') && get_query_var('page_id') == get_option('page_for_posts') && !$redirect_url) {
if ($redirect_url = get_permalink(get_option('page_for_posts'))) {
$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', $redirect['query']);
}
// now moving on to non ?m=X year/month/day links
} elseif (is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_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'), $redirect['query']);
}
} elseif (is_month() && get_query_var('year') && !empty($_GET['monthnum'])) {
if ($redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum'))) {
$redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
}
} elseif (is_year() && !empty($_GET['year'])) {
if ($redirect_url = get_year_link(get_query_var('year'))) {
$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", $author->ID))) {
if ($redirect_url = get_author_posts_url($author->ID, $author->user_nicename)) {
$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) {
$term_count += count($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, $obj->taxonomy)) && !is_wp_error($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($_GET));
if (!array_diff($rewrite_vars, array_keys($_GET))) {
// Check to see if all the Query vars are coming from the rewrite, none are set via $_GET
$redirect['query'] = remove_query_arg($qv_remove, $redirect['query']);
//Remove all of the per-tax qv's
// Create the destination url for this taxonomy
$tax_url = parse_url($tax_url);
if (!empty($tax_url['query'])) {
// Taxonomy accessible via ?taxonomy=..&term=.. or any custom qv..
parse_str($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 && ($cat = get_query_var('category_name'))) {
$category = get_category_by_path($cat);
$post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
if (!$category || is_wp_error($category) || !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms)) {
$redirect_url = get_permalink($wp_query->get_queried_object_id());
}
}
// Post Paging
if (is_singular() && !is_front_page() && get_query_var('page')) {
if (!$redirect_url) {
$redirect_url = get_permalink(get_queried_object_id());
}
$redirect_url = trailingslashit($redirect_url) . user_trailingslashit(get_query_var('page'), 'single_paged');
$redirect['query'] = remove_query_arg('page', $redirect['query']);
}
// paging and feeds
if (get_query_var('paged') || is_feed() || get_query_var('cpage')) {
while (preg_match("#/{$wp_rewrite->pagination_base}/?[0-9]+?(/+)?\$#", $redirect['path']) || preg_match('#/(comments/?)?(feed|rss|rdf|atom|rss2)(/+)?$#', $redirect['path']) || preg_match("#/{$wp_rewrite->comments_pagination_base}-[0-9]+(/+)?\$#", $redirect['path'])) {
// Strip off paging and feed
$redirect['path'] = preg_replace("#/{$wp_rewrite->pagination_base}/?[0-9]+?(/+)?\$#", '/', $redirect['path']);
// strip off any existing paging
$redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path']);
// strip off feed endings
$redirect['path'] = preg_replace("#/{$wp_rewrite->comments_pagination_base}-[0-9]+?(/+)?\$#", '/', $redirect['path']);
// strip off any existing comment paging
}
$addl_path = '';
if (is_feed() && in_array(get_query_var('feed'), $wp_rewrite->feeds)) {
$addl_path = !empty($addl_path) ? trailingslashit($addl_path) : '';
if (!is_singular() && get_query_var('withcomments')) {
$addl_path .= 'comments/';
}
if ('rss' == get_default_feed() && 'feed' == get_query_var('feed') || 'rss' == get_query_var('feed')) {
$addl_path .= user_trailingslashit('feed/' . (get_default_feed() == 'rss2' ? '' : 'rss2'), 'feed');
} else {
$addl_path .= user_trailingslashit('feed/' . (get_default_feed() == get_query_var('feed') || 'feed' == get_query_var('feed') ? '' : get_query_var('feed')), 'feed');
}
$redirect['query'] = remove_query_arg('feed', $redirect['query']);
} elseif (is_feed() && 'old' == get_query_var('feed')) {
$old_feed_files = array('wp-atom.php' => 'atom', 'wp-commentsrss2.php' => 'comments_rss2', 'wp-feed.php' => get_default_feed(), 'wp-rdf.php' => 'rdf', 'wp-rss.php' => 'rss2', 'wp-rss2.php' => 'rss2');
if (isset($old_feed_files[basename($redirect['path'])])) {
$redirect_url = get_feed_link($old_feed_files[basename($redirect['path'])]);
wp_redirect($redirect_url, 301);
die;
}
}
if (get_query_var('paged') > 0) {
$paged = get_query_var('paged');
$redirect['query'] = remove_query_arg('paged', $redirect['query']);
if (!is_feed()) {
if ($paged > 1 && !is_single()) {
$addl_path = (!empty($addl_path) ? trailingslashit($addl_path) : '') . user_trailingslashit("{$wp_rewrite->pagination_base}/{$paged}", 'paged');
} elseif (!is_single()) {
$addl_path = !empty($addl_path) ? trailingslashit($addl_path) : '';
}
} elseif ($paged > 1) {
$redirect['query'] = add_query_arg('paged', $paged, $redirect['query']);
}
}
if (get_option('page_comments') && ('newest' == get_option('default_comments_page') && get_query_var('cpage') > 0 || 'newest' != get_option('default_comments_page') && get_query_var('cpage') > 1)) {
$addl_path = (!empty($addl_path) ? trailingslashit($addl_path) : '') . user_trailingslashit($wp_rewrite->comments_pagination_base . '-' . get_query_var('cpage'), 'commentpaged');
$redirect['query'] = remove_query_arg('cpage', $redirect['query']);
}
$redirect['path'] = user_trailingslashit(preg_replace('|/' . preg_quote($wp_rewrite->index, '|') . '/?$|', '/', $redirect['path']));
// strip off trailing /index.php/
if (!empty($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;
}
}
// tack on any additional query vars
$redirect['query'] = preg_replace('#^\\??&*?#', '', $redirect['query']);
if ($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']);
}
}
$_parsed_query = rawurlencode_deep($_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']);
// Remove trailing spaces from the path
$redirect['path'] = preg_replace('#(%20| )+$#', '', $redirect['path']);
if (!empty($redirect['query'])) {
// Remove trailing spaces from certain terminating query string args
$redirect['query'] = preg_replace('#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$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']);
}
// 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']);
}
// Ignore differences in host capitalization, as this can lead to infinite redirects
// Only redirect no-www <=> yes-www
if (strtolower($original['host']) == strtolower($redirect['host']) || strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host'])) {
$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')) {
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);
}
/**
* Filter 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 || $redirect_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 $redirect_url;
}
}
function redirect_canonical($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($_POST)) {
return;
}
if (!$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;
}
}
