3 * Canonical API to handle WordPress Redirecting
5 * Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference"
13 * Redirects incoming links to the proper URL based on the site url.
15 * Search engines consider www.somedomain.com and somedomain.com to be two
16 * different URLs when they both go to the same location. This SEO enhancement
17 * prevents penalty for duplicate content by redirecting all incoming links to
20 * Prevents redirection for feeds, trackbacks, searches, comment popup, and
21 * admin URLs. Does not redirect on non-pretty-permalink-supporting IIS 7+,
22 * page/post previews, WP admin, Trackbacks, robots.txt, searches, or on POST
25 * Will also attempt to find the correct link when a user enters a URL that does
26 * not exist based on exact WordPress query. Will instead try to parse the URL
27 * or query in an attempt to figure the correct page to go to.
31 * @global WP_Rewrite $wp_rewrite
32 * @global bool $is_IIS
33 * @global WP_Query $wp_query
34 * @global wpdb $wpdb WordPress database abstraction object.
36 * @param string $requested_url Optional. The URL that was requested, used to
37 * figure if redirect is needed.
38 * @param bool $do_redirect Optional. Redirect to the new URL.
39 * @return string|void The string of the URL, if redirect needed.
41 function redirect_canonical( $requested_url = null, $do_redirect = true ) {
42 global $wp_rewrite, $is_IIS, $wp_query, $wpdb, $wp;
44 if ( isset( $_SERVER['REQUEST_METHOD'] ) && ! in_array( strtoupper( $_SERVER['REQUEST_METHOD'] ), array( 'GET', 'HEAD' ) ) ) {
48 // If we're not in wp-admin and the post has been published and preview nonce
49 // is non-existent or invalid then no need for preview in query
50 if ( is_preview() && get_query_var( 'p' ) && 'publish' == get_post_status( get_query_var( 'p' ) ) ) {
51 if ( ! isset( $_GET['preview_id'] )
52 || ! isset( $_GET['preview_nonce'] )
53 || ! wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . (int) $_GET['preview_id'] ) ) {
54 $wp_query->is_preview = false;
58 if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || is_preview() || is_robots() || ( $is_IIS && !iis7_supports_permalinks() ) ) {
62 if ( ! $requested_url && isset( $_SERVER['HTTP_HOST'] ) ) {
63 // build the URL in the address bar
64 $requested_url = is_ssl() ? 'https://' : 'http://';
65 $requested_url .= $_SERVER['HTTP_HOST'];
66 $requested_url .= $_SERVER['REQUEST_URI'];
69 $original = @parse_url($requested_url);
70 if ( false === $original ) {
74 $redirect = $original;
75 $redirect_url = false;
78 if ( !isset($redirect['path']) )
79 $redirect['path'] = '';
80 if ( !isset($redirect['query']) )
81 $redirect['query'] = '';
83 // If the original URL ended with non-breaking spaces, they were almost
84 // certainly inserted by accident. Let's remove them, so the reader doesn't
85 // see a 404 error with no obvious cause.
86 $redirect['path'] = preg_replace( '|(%C2%A0)+$|i', '', $redirect['path'] );
88 // It's not a preview, so remove it from URL
89 if ( get_query_var( 'preview' ) ) {
90 $redirect['query'] = remove_query_arg( 'preview', $redirect['query'] );
93 if ( is_feed() && ( $id = get_query_var( 'p' ) ) ) {
94 if ( $redirect_url = get_post_comments_feed_link( $id, get_query_var( 'feed' ) ) ) {
95 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type', 'feed'), $redirect_url );
96 $redirect['path'] = parse_url( $redirect_url, PHP_URL_PATH );
100 if ( is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) {
102 $vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) );
104 if ( isset($vars[0]) && $vars = $vars[0] ) {
105 if ( 'revision' == $vars->post_type && $vars->post_parent > 0 )
106 $id = $vars->post_parent;
108 if ( $redirect_url = get_permalink($id) )
109 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), $redirect_url );
113 // These tests give us a WP-generated permalink
116 // Redirect ?page_id, ?p=, ?attachment_id= to their respective url's
117 $id = max( get_query_var('p'), get_query_var('page_id'), get_query_var('attachment_id') );
118 if ( $id && $redirect_post = get_post($id) ) {
119 $post_type_obj = get_post_type_object($redirect_post->post_type);
120 if ( $post_type_obj->public && 'auto-draft' != $redirect_post->post_status ) {
121 $redirect_url = get_permalink($redirect_post);
122 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'p', 'page_id', 'attachment_id', 'pagename', 'name', 'post_type' ), $redirect_url );
126 if ( get_query_var( 'day' ) && get_query_var( 'monthnum' ) && get_query_var( 'year' ) ) {
127 $year = get_query_var( 'year' );
128 $month = get_query_var( 'monthnum' );
129 $day = get_query_var( 'day' );
130 $date = sprintf( '%04d-%02d-%02d', $year, $month, $day );
131 if ( ! wp_checkdate( $month, $day, $year, $date ) ) {
132 $redirect_url = get_month_link( $year, $month );
133 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'year', 'monthnum', 'day' ), $redirect_url );
135 } elseif ( get_query_var( 'monthnum' ) && get_query_var( 'year' ) && 12 < get_query_var( 'monthnum' ) ) {
136 $redirect_url = get_year_link( get_query_var( 'year' ) );
137 $redirect['query'] = _remove_qs_args_if_not_in_url( $redirect['query'], array( 'year', 'monthnum' ), $redirect_url );
140 if ( ! $redirect_url ) {
141 if ( $redirect_url = redirect_guess_404_permalink() ) {
142 $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 );
146 if ( get_query_var( 'page' ) && $wp_query->post &&
147 false !== strpos( $wp_query->post->post_content, '<!--nextpage-->' ) ) {
148 $redirect['path'] = rtrim( $redirect['path'], (int) get_query_var( 'page' ) . '/' );
149 $redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
150 $redirect_url = get_permalink( $wp_query->post->ID );
153 } elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) {
154 // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
155 if ( is_attachment() &&
156 ! array_diff( array_keys( $wp->query_vars ), array( 'attachment', 'attachment_id' ) ) &&
158 if ( ! empty( $_GET['attachment_id'] ) ) {
159 $redirect_url = get_attachment_link( get_query_var( 'attachment_id' ) );
160 if ( $redirect_url ) {
161 $redirect['query'] = remove_query_arg( 'attachment_id', $redirect['query'] );
164 $redirect_url = get_attachment_link();
166 } elseif ( is_single() && !empty($_GET['p']) && ! $redirect_url ) {
167 if ( $redirect_url = get_permalink(get_query_var('p')) )
168 $redirect['query'] = remove_query_arg(array('p', 'post_type'), $redirect['query']);
169 } elseif ( is_single() && !empty($_GET['name']) && ! $redirect_url ) {
170 if ( $redirect_url = get_permalink( $wp_query->get_queried_object_id() ) )
171 $redirect['query'] = remove_query_arg('name', $redirect['query']);
172 } elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) {
173 if ( $redirect_url = get_permalink(get_query_var('page_id')) )
174 $redirect['query'] = remove_query_arg('page_id', $redirect['query']);
175 } elseif ( is_page() && !is_feed() && isset($wp_query->queried_object) && 'page' == get_option('show_on_front') && $wp_query->queried_object->ID == get_option('page_on_front') && ! $redirect_url ) {
176 $redirect_url = home_url('/');
177 } elseif ( is_home() && !empty($_GET['page_id']) && 'page' == get_option('show_on_front') && get_query_var('page_id') == get_option('page_for_posts') && ! $redirect_url ) {
178 if ( $redirect_url = get_permalink(get_option('page_for_posts')) )
179 $redirect['query'] = remove_query_arg('page_id', $redirect['query']);
180 } elseif ( !empty($_GET['m']) && ( is_year() || is_month() || is_day() ) ) {
181 $m = get_query_var('m');
182 switch ( strlen($m) ) {
184 $redirect_url = get_year_link($m);
187 $redirect_url = get_month_link( substr($m, 0, 4), substr($m, 4, 2) );
190 $redirect_url = get_day_link(substr($m, 0, 4), substr($m, 4, 2), substr($m, 6, 2));
194 $redirect['query'] = remove_query_arg('m', $redirect['query']);
195 // now moving on to non ?m=X year/month/day links
196 } elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_GET['day']) ) {
197 if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) )
198 $redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']);
199 } elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) {
200 if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) )
201 $redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
202 } elseif ( is_year() && !empty($_GET['year']) ) {
203 if ( $redirect_url = get_year_link(get_query_var('year')) )
204 $redirect['query'] = remove_query_arg('year', $redirect['query']);
205 } elseif ( is_author() && !empty($_GET['author']) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) {
206 $author = get_userdata(get_query_var('author'));
207 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 ) ) ) {
208 if ( $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) )
209 $redirect['query'] = remove_query_arg('author', $redirect['query']);
211 } elseif ( is_category() || is_tag() || is_tax() ) { // Terms (Tags/categories)
214 foreach ( $wp_query->tax_query->queried_terms as $tax_query )
215 $term_count += count( $tax_query['terms'] );
217 $obj = $wp_query->get_queried_object();
218 if ( $term_count <= 1 && !empty($obj->term_id) && ( $tax_url = get_term_link((int)$obj->term_id, $obj->taxonomy) ) && !is_wp_error($tax_url) ) {
219 if ( !empty($redirect['query']) ) {
220 // Strip taxonomy query vars off the url.
221 $qv_remove = array( 'term', 'taxonomy');
222 if ( is_category() ) {
223 $qv_remove[] = 'category_name';
224 $qv_remove[] = 'cat';
225 } elseif ( is_tag() ) {
226 $qv_remove[] = 'tag';
227 $qv_remove[] = 'tag_id';
228 } else { // Custom taxonomies will have a custom query var, remove those too:
229 $tax_obj = get_taxonomy( $obj->taxonomy );
230 if ( false !== $tax_obj->query_var )
231 $qv_remove[] = $tax_obj->query_var;
234 $rewrite_vars = array_diff( array_keys($wp_query->query), array_keys($_GET) );
236 if ( !array_diff($rewrite_vars, array_keys($_GET)) ) { // Check to see if all the Query vars are coming from the rewrite, none are set via $_GET
237 $redirect['query'] = remove_query_arg($qv_remove, $redirect['query']); //Remove all of the per-tax qv's
239 // Create the destination url for this taxonomy
240 $tax_url = parse_url($tax_url);
241 if ( ! empty($tax_url['query']) ) { // Taxonomy accessible via ?taxonomy=..&term=.. or any custom qv..
242 parse_str($tax_url['query'], $query_vars);
243 $redirect['query'] = add_query_arg($query_vars, $redirect['query']);
244 } else { // Taxonomy is accessible via a "pretty-URL"
245 $redirect['path'] = $tax_url['path'];
248 } else { // Some query vars are set via $_GET. Unset those from $_GET that exist via the rewrite
249 foreach ( $qv_remove as $_qv ) {
250 if ( isset($rewrite_vars[$_qv]) )
251 $redirect['query'] = remove_query_arg($_qv, $redirect['query']);
257 } elseif ( is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false && $cat = get_query_var( 'category_name' ) ) {
258 $category = get_category_by_path( $cat );
259 $post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
260 if ( (!$category || is_wp_error($category)) || ( !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms) ) )
261 $redirect_url = get_permalink($wp_query->get_queried_object_id());
265 if ( is_singular() && ! is_front_page() && get_query_var('page') ) {
266 if ( !$redirect_url )
267 $redirect_url = get_permalink( get_queried_object_id() );
268 $redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
269 $redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
273 if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) {
274 while ( preg_match( "#/$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'] ) ) {
275 // Strip off paging and feed
276 $redirect['path'] = preg_replace("#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", '/', $redirect['path']); // strip off any existing paging
277 $redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path']); // strip off feed endings
278 $redirect['path'] = preg_replace("#/{$wp_rewrite->comments_pagination_base}-[0-9]+?(/+)?$#", '/', $redirect['path']); // strip off any existing comment paging
282 if ( is_feed() && in_array( get_query_var('feed'), $wp_rewrite->feeds ) ) {
283 $addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
284 if ( !is_singular() && get_query_var( 'withcomments' ) )
285 $addl_path .= 'comments/';
286 if ( ( 'rss' == get_default_feed() && 'feed' == get_query_var('feed') ) || 'rss' == get_query_var('feed') )
287 $addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == 'rss2' ) ? '' : 'rss2' ), 'feed' );
289 $addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
290 $redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
291 } elseif ( is_feed() && 'old' == get_query_var('feed') ) {
292 $old_feed_files = array(
293 'wp-atom.php' => 'atom',
294 'wp-commentsrss2.php' => 'comments_rss2',
295 'wp-feed.php' => get_default_feed(),
296 'wp-rdf.php' => 'rdf',
297 'wp-rss.php' => 'rss2',
298 'wp-rss2.php' => 'rss2',
300 if ( isset( $old_feed_files[ basename( $redirect['path'] ) ] ) ) {
301 $redirect_url = get_feed_link( $old_feed_files[ basename( $redirect['path'] ) ] );
302 wp_redirect( $redirect_url, 301 );
307 if ( get_query_var('paged') > 0 ) {
308 $paged = get_query_var('paged');
309 $redirect['query'] = remove_query_arg( 'paged', $redirect['query'] );
311 if ( $paged > 1 && !is_single() ) {
312 $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("$wp_rewrite->pagination_base/$paged", 'paged');
313 } elseif ( !is_single() ) {
314 $addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
316 } elseif ( $paged > 1 ) {
317 $redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );
321 if ( get_option( 'page_comments' ) && (
322 ( 'newest' == get_option( 'default_comments_page' ) && get_query_var( 'cpage' ) > 0 ) ||
323 ( 'newest' != get_option( 'default_comments_page' ) && get_query_var( 'cpage' ) > 1 )
325 $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit( $wp_rewrite->comments_pagination_base . '-' . get_query_var('cpage'), 'commentpaged' );
326 $redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] );
329 $redirect['path'] = user_trailingslashit( preg_replace('|/' . preg_quote( $wp_rewrite->index, '|' ) . '/?$|', '/', $redirect['path']) ); // strip off trailing /index.php/
330 if ( !empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos($redirect['path'], '/' . $wp_rewrite->index . '/') === false )
331 $redirect['path'] = trailingslashit($redirect['path']) . $wp_rewrite->index . '/';
332 if ( !empty( $addl_path ) )
333 $redirect['path'] = trailingslashit($redirect['path']) . $addl_path;
334 $redirect_url = $redirect['scheme'] . '://' . $redirect['host'] . $redirect['path'];
337 if ( 'wp-register.php' == basename( $redirect['path'] ) ) {
338 if ( is_multisite() ) {
339 /** This filter is documented in wp-login.php */
340 $redirect_url = apply_filters( 'wp_signup_location', network_site_url( 'wp-signup.php' ) );
342 $redirect_url = wp_registration_url();
345 wp_redirect( $redirect_url, 301 );
350 // tack on any additional query vars
351 $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
352 if ( $redirect_url && !empty($redirect['query']) ) {
353 parse_str( $redirect['query'], $_parsed_query );
354 $redirect = @parse_url($redirect_url);
356 if ( ! empty( $_parsed_query['name'] ) && ! empty( $redirect['query'] ) ) {
357 parse_str( $redirect['query'], $_parsed_redirect_query );
359 if ( empty( $_parsed_redirect_query['name'] ) )
360 unset( $_parsed_query['name'] );
363 $_parsed_query = rawurlencode_deep( $_parsed_query );
364 $redirect_url = add_query_arg( $_parsed_query, $redirect_url );
368 $redirect = @parse_url($redirect_url);
370 // www.example.com vs example.com
371 $user_home = @parse_url(home_url());
372 if ( !empty($user_home['host']) )
373 $redirect['host'] = $user_home['host'];
374 if ( empty($user_home['path']) )
375 $user_home['path'] = '/';
378 if ( !empty($user_home['port']) )
379 $redirect['port'] = $user_home['port'];
381 unset($redirect['port']);
383 // trailing /index.php
384 $redirect['path'] = preg_replace('|/' . preg_quote( $wp_rewrite->index, '|' ) . '/*?$|', '/', $redirect['path']);
386 // Remove trailing spaces from the path
387 $redirect['path'] = preg_replace( '#(%20| )+$#', '', $redirect['path'] );
389 if ( !empty( $redirect['query'] ) ) {
390 // Remove trailing spaces from certain terminating query string args
391 $redirect['query'] = preg_replace( '#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$1', $redirect['query'] );
393 // Clean up empty query strings
394 $redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query']), '&');
396 // Redirect obsolete feeds
397 $redirect['query'] = preg_replace( '#(^|&)feed=rss(&|$)#', '$1feed=rss2$2', $redirect['query'] );
399 // Remove redundant leading ampersands
400 $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
403 // strip /index.php/ when we're not using PATHINFO permalinks
404 if ( !$wp_rewrite->using_index_permalinks() )
405 $redirect['path'] = str_replace( '/' . $wp_rewrite->index . '/', '/', $redirect['path'] );
408 if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_front_page() || ( is_front_page() && (get_query_var('paged') > 1) ) ) ) {
410 if ( get_query_var('paged') > 0 ) {
411 $user_ts_type = 'paged';
413 foreach ( array('single', 'category', 'page', 'day', 'month', 'year', 'home') as $type ) {
414 $func = 'is_' . $type;
415 if ( call_user_func($func) ) {
416 $user_ts_type = $type;
421 $redirect['path'] = user_trailingslashit($redirect['path'], $user_ts_type);
422 } elseif ( is_front_page() ) {
423 $redirect['path'] = trailingslashit($redirect['path']);
426 // Strip multiple slashes out of the URL
427 if ( strpos($redirect['path'], '//') > -1 )
428 $redirect['path'] = preg_replace('|/+|', '/', $redirect['path']);
430 // Always trailing slash the Front Page URL
431 if ( trailingslashit( $redirect['path'] ) == trailingslashit( $user_home['path'] ) )
432 $redirect['path'] = trailingslashit($redirect['path']);
434 // Ignore differences in host capitalization, as this can lead to infinite redirects
435 // Only redirect no-www <=> yes-www
436 if ( strtolower($original['host']) == strtolower($redirect['host']) ||
437 ( strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host']) ) )
438 $redirect['host'] = $original['host'];
440 $compare_original = array( $original['host'], $original['path'] );
442 if ( !empty( $original['port'] ) )
443 $compare_original[] = $original['port'];
445 if ( !empty( $original['query'] ) )
446 $compare_original[] = $original['query'];
448 $compare_redirect = array( $redirect['host'], $redirect['path'] );
450 if ( !empty( $redirect['port'] ) )
451 $compare_redirect[] = $redirect['port'];
453 if ( !empty( $redirect['query'] ) )
454 $compare_redirect[] = $redirect['query'];
456 if ( $compare_original !== $compare_redirect ) {
457 $redirect_url = $redirect['scheme'] . '://' . $redirect['host'];
458 if ( !empty($redirect['port']) )
459 $redirect_url .= ':' . $redirect['port'];
460 $redirect_url .= $redirect['path'];
461 if ( !empty($redirect['query']) )
462 $redirect_url .= '?' . $redirect['query'];
465 if ( ! $redirect_url || $redirect_url == $requested_url ) {
469 // Hex encoded octets are case-insensitive.
470 if ( false !== strpos($requested_url, '%') ) {
471 if ( !function_exists('lowercase_octets') ) {
472 function lowercase_octets($matches) {
473 return strtolower( $matches[0] );
476 $requested_url = preg_replace_callback('|%[a-fA-F0-9][a-fA-F0-9]|', 'lowercase_octets', $requested_url);
480 * Filter the canonical redirect URL.
482 * Returning false to this filter will cancel the redirect.
486 * @param string $redirect_url The redirect URL.
487 * @param string $requested_url The requested URL.
489 $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url );
491 // yes, again -- in case the filter aborted the request
492 if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) == strip_fragment_from_url( $requested_url ) ) {
496 if ( $do_redirect ) {
497 // protect against chained redirects
498 if ( !redirect_canonical($redirect_url, false) ) {
499 wp_redirect($redirect_url, 301);
503 // die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) );
507 return $redirect_url;
512 * Removes arguments from a query string if they are not present in a URL
513 * DO NOT use this in plugin code.
518 * @param string $query_string
519 * @param array $args_to_check
521 * @return string The altered query string
523 function _remove_qs_args_if_not_in_url( $query_string, Array $args_to_check, $url ) {
524 $parsed_url = @parse_url( $url );
525 if ( ! empty( $parsed_url['query'] ) ) {
526 parse_str( $parsed_url['query'], $parsed_query );
527 foreach ( $args_to_check as $qv ) {
528 if ( !isset( $parsed_query[$qv] ) )
529 $query_string = remove_query_arg( $qv, $query_string );
532 $query_string = remove_query_arg( $args_to_check, $query_string );
534 return $query_string;
538 * Strips the #fragment from a URL, if one is present.
542 * @param string $url The URL to strip.
543 * @return string The altered URL.
545 function strip_fragment_from_url( $url ) {
546 $parsed_url = @parse_url( $url );
547 if ( ! empty( $parsed_url['host'] ) ) {
548 // This mirrors code in redirect_canonical(). It does not handle every case.
549 $url = $parsed_url['scheme'] . '://' . $parsed_url['host'];
550 if ( ! empty( $parsed_url['port'] ) ) {
551 $url .= ':' . $parsed_url['port'];
553 $url .= $parsed_url['path'];
554 if ( ! empty( $parsed_url['query'] ) ) {
555 $url .= '?' . $parsed_url['query'];
563 * Attempts to guess the correct URL based on query vars
567 * @global wpdb $wpdb WordPress database abstraction object.
569 * @return false|string The correct URL if one is found. False on failure.
571 function redirect_guess_404_permalink() {
574 if ( get_query_var('name') ) {
575 $where = $wpdb->prepare("post_name LIKE %s", $wpdb->esc_like( get_query_var('name') ) . '%');
577 // if any of post_type, year, monthnum, or day are set, use them to refine the query
578 if ( get_query_var('post_type') )
579 $where .= $wpdb->prepare(" AND post_type = %s", get_query_var('post_type'));
581 $where .= " AND post_type IN ('" . implode( "', '", get_post_types( array( 'public' => true ) ) ) . "')";
583 if ( get_query_var('year') )
584 $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year'));
585 if ( get_query_var('monthnum') )
586 $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum'));
587 if ( get_query_var('day') )
588 $where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day'));
590 $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'");
593 if ( get_query_var( 'feed' ) )
594 return get_post_comments_feed_link( $post_id, get_query_var( 'feed' ) );
595 elseif ( get_query_var( 'page' ) && 1 < get_query_var( 'page' ) )
596 return trailingslashit( get_permalink( $post_id ) ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
598 return get_permalink( $post_id );
606 * @global WP_Rewrite $wp_rewrite
608 function wp_redirect_admin_locations() {
610 if ( ! ( is_404() && $wp_rewrite->using_permalinks() ) )
614 home_url( 'wp-admin', 'relative' ),
615 home_url( 'dashboard', 'relative' ),
616 home_url( 'admin', 'relative' ),
617 site_url( 'dashboard', 'relative' ),
618 site_url( 'admin', 'relative' ),
620 if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $admins ) ) {
621 wp_redirect( admin_url() );
626 home_url( 'wp-login.php', 'relative' ),
627 home_url( 'login', 'relative' ),
628 site_url( 'login', 'relative' ),
630 if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $logins ) ) {
631 wp_redirect( wp_login_url() );