| [ Index ] |
PHP Cross Reference of Wordpress 2.9.1 |
[Summary view] [Print] [Text view]
1 <?php 2 /** 3 * Canonical API to handle WordPress Redirecting 4 * 5 * Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference" 6 * by Mark Jaquith 7 * 8 * @author Scott Yang 9 * @author Mark Jaquith 10 * @package WordPress 11 * @since 2.3.0 12 */ 13 14 /** 15 * Redirects incoming links to the proper URL based on the site url. 16 * 17 * Search engines consider www.somedomain.com and somedomain.com to be two 18 * different URLs when they both go to the same location. This SEO enhancement 19 * prevents penality for duplicate content by redirecting all incoming links to 20 * one or the other. 21 * 22 * Prevents redirection for feeds, trackbacks, searches, comment popup, and 23 * admin URLs. Does not redirect on IIS, page/post previews, and on form data. 24 * 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. 28 * 29 * @since 2.3.0 30 * @uses $wp_rewrite 31 * @uses $is_IIS 32 * 33 * @param string $requested_url Optional. The URL that was requested, used to 34 * figure if redirect is needed. 35 * @param bool $do_redirect Optional. Redirect to the new URL. 36 * @return null|false|string Null, if redirect not needed. False, if redirect 37 * not needed or the string of the URL 38 */ 39 function redirect_canonical($requested_url=null, $do_redirect=true) { 40 global $wp_rewrite, $is_IIS, $wp_query, $wpdb; 41 42 if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() || is_robots() ) 43 return; 44 45 if ( !$requested_url ) { 46 // build the URL in the address bar 47 $requested_url = ( !empty($_SERVER['HTTPS'] ) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://'; 48 $requested_url .= $_SERVER['HTTP_HOST']; 49 $requested_url .= $_SERVER['REQUEST_URI']; 50 } 51 52 $original = @parse_url($requested_url); 53 if ( false === $original ) 54 return; 55 56 // Some PHP setups turn requests for / into /index.php in REQUEST_URI 57 // See: http://trac.wordpress.org/ticket/5017 58 // See: http://trac.wordpress.org/ticket/7173 59 // Disabled, for now: 60 // $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']); 61 62 $redirect = $original; 63 $redirect_url = false; 64 65 // Notice fixing 66 if ( !isset($redirect['path']) ) $redirect['path'] = ''; 67 if ( !isset($redirect['query']) ) $redirect['query'] = ''; 68 69 if ( is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) { 70 71 $vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) ); 72 73 if ( isset($vars[0]) && $vars = $vars[0] ) { 74 if ( 'revision' == $vars->post_type && $vars->post_parent > 0 ) 75 $id = $vars->post_parent; 76 77 if ( $redirect_url = get_permalink($id) ) 78 $redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id'), $redirect['query']); 79 } 80 } 81 82 // These tests give us a WP-generated permalink 83 if ( is_404() ) { 84 $redirect_url = redirect_guess_404_permalink(); 85 } elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) { 86 // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101 87 if ( is_attachment() && !empty($_GET['attachment_id']) && ! $redirect_url ) { 88 if ( $redirect_url = get_attachment_link(get_query_var('attachment_id')) ) 89 $redirect['query'] = remove_query_arg('attachment_id', $redirect['query']); 90 } elseif ( is_single() && !empty($_GET['p']) && ! $redirect_url ) { 91 if ( $redirect_url = get_permalink(get_query_var('p')) ) 92 $redirect['query'] = remove_query_arg('p', $redirect['query']); 93 if ( get_query_var( 'page' ) ) { 94 $redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' ); 95 $redirect['query'] = remove_query_arg( 'page', $redirect['query'] ); 96 } 97 } elseif ( is_single() && !empty($_GET['name']) && ! $redirect_url ) { 98 if ( $redirect_url = get_permalink( $wp_query->get_queried_object_id() ) ) 99 $redirect['query'] = remove_query_arg('name', $redirect['query']); 100 } elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) { 101 if ( $redirect_url = get_permalink(get_query_var('page_id')) ) 102 $redirect['query'] = remove_query_arg('page_id', $redirect['query']); 103 } elseif ( !empty($_GET['m']) && ( is_year() || is_month() || is_day() ) ) { 104 $m = get_query_var('m'); 105 switch ( strlen($m) ) { 106 case 4: // Yearly 107 $redirect_url = get_year_link($m); 108 break; 109 case 6: // Monthly 110 $redirect_url = get_month_link( substr($m, 0, 4), substr($m, 4, 2) ); 111 break; 112 case 8: // Daily 113 $redirect_url = get_day_link(substr($m, 0, 4), substr($m, 4, 2), substr($m, 6, 2)); 114 break; 115 } 116 if ( $redirect_url ) 117 $redirect['query'] = remove_query_arg('m', $redirect['query']); 118 // now moving on to non ?m=X year/month/day links 119 } elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_GET['day']) ) { 120 if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) ) 121 $redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']); 122 } elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) { 123 if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) ) 124 $redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']); 125 } elseif ( is_year() && !empty($_GET['year']) ) { 126 if ( $redirect_url = get_year_link(get_query_var('year')) ) 127 $redirect['query'] = remove_query_arg('year', $redirect['query']); 128 } elseif ( is_category() && !empty($_GET['cat']) && preg_match( '|^[0-9]+$|', $_GET['cat'] ) ) { 129 if ( $redirect_url = get_category_link(get_query_var('cat')) ) 130 $redirect['query'] = remove_query_arg('cat', $redirect['query']); 131 } elseif ( is_author() && !empty($_GET['author']) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) { 132 $author = get_userdata(get_query_var('author')); 133 if ( false !== $author && $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) ) 134 $redirect['query'] = remove_query_arg('author', $redirect['author']); 135 } 136 137 // paging and feeds 138 if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) { 139 if ( !$redirect_url ) 140 $redirect_url = $requested_url; 141 $paged_redirect = @parse_url($redirect_url); 142 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'] ) ) { 143 // Strip off paging and feed 144 $paged_redirect['path'] = preg_replace('#/page/[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing paging 145 $paged_redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $paged_redirect['path']); // strip off feed endings 146 $paged_redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $paged_redirect['path']); // strip off any existing comment paging 147 } 148 149 $addl_path = ''; 150 if ( is_feed() ) { 151 $addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : ''; 152 if ( get_query_var( 'withcomments' ) ) 153 $addl_path .= 'comments/'; 154 $addl_path .= user_trailingslashit( 'feed/' . ( ( 'rss2' == get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' ); 155 $redirect['query'] = remove_query_arg( 'feed', $redirect['query'] ); 156 } 157 158 if ( get_query_var('paged') > 0 ) { 159 $paged = get_query_var('paged'); 160 $redirect['query'] = remove_query_arg( 'paged', $redirect['query'] ); 161 if ( !is_feed() ) { 162 if ( $paged > 1 && !is_single() ) { 163 $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("page/$paged", 'paged'); 164 } elseif ( !is_single() ) { 165 $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit($paged_redirect['path'], 'paged'); 166 } 167 } elseif ( $paged > 1 ) { 168 $redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] ); 169 } 170 } 171 172 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 ) ) ) { 173 $addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit( 'comment-page-' . get_query_var('cpage'), 'commentpaged' ); 174 $redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] ); 175 } 176 177 $paged_redirect['path'] = user_trailingslashit( preg_replace('|/index.php/?$|', '/', $paged_redirect['path']) ); // strip off trailing /index.php/ 178 if ( !empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos($paged_redirect['path'], '/index.php/') === false ) 179 $paged_redirect['path'] = trailingslashit($paged_redirect['path']) . 'index.php/'; 180 if ( !empty( $addl_path ) ) 181 $paged_redirect['path'] = trailingslashit($paged_redirect['path']) . $addl_path; 182 $redirect_url = $paged_redirect['scheme'] . '://' . $paged_redirect['host'] . $paged_redirect['path']; 183 $redirect['path'] = $paged_redirect['path']; 184 } 185 } 186 187 // tack on any additional query vars 188 $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] ); 189 if ( $redirect_url && !empty($redirect['query']) ) { 190 if ( strpos($redirect_url, '?') !== false ) 191 $redirect_url .= '&'; 192 else 193 $redirect_url .= '?'; 194 $redirect_url .= $redirect['query']; 195 } 196 197 if ( $redirect_url ) 198 $redirect = @parse_url($redirect_url); 199 200 // www.example.com vs example.com 201 $user_home = @parse_url(get_option('home')); 202 if ( !empty($user_home['host']) ) 203 $redirect['host'] = $user_home['host']; 204 if ( empty($user_home['path']) ) 205 $user_home['path'] = '/'; 206 207 // Handle ports 208 if ( !empty($user_home['port']) ) 209 $redirect['port'] = $user_home['port']; 210 else 211 unset($redirect['port']); 212 213 // trailing /index.php 214 $redirect['path'] = preg_replace('|/index.php/*?$|', '/', $redirect['path']); 215 216 // Remove trailing spaces from the path 217 $redirect['path'] = preg_replace( '#(%20| )+$#', '', $redirect['path'] ); 218 219 if ( !empty( $redirect['query'] ) ) { 220 // Remove trailing spaces from certain terminating query string args 221 $redirect['query'] = preg_replace( '#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$1', $redirect['query'] ); 222 223 // Clean up empty query strings 224 $redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query']), '&'); 225 226 // Remove redundant leading ampersands 227 $redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] ); 228 } 229 230 // strip /index.php/ when we're not using PATHINFO permalinks 231 if ( !$wp_rewrite->using_index_permalinks() ) 232 $redirect['path'] = str_replace('/index.php/', '/', $redirect['path']); 233 234 // trailing slashes 235 if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_front_page() || ( is_front_page() && (get_query_var('paged') > 1) ) ) ) { 236 $user_ts_type = ''; 237 if ( get_query_var('paged') > 0 ) { 238 $user_ts_type = 'paged'; 239 } else { 240 foreach ( array('single', 'category', 'page', 'day', 'month', 'year', 'home') as $type ) { 241 $func = 'is_' . $type; 242 if ( call_user_func($func) ) { 243 $user_ts_type = $type; 244 break; 245 } 246 } 247 } 248 $redirect['path'] = user_trailingslashit($redirect['path'], $user_ts_type); 249 } elseif ( is_front_page() ) { 250 $redirect['path'] = trailingslashit($redirect['path']); 251 } 252 253 // Always trailing slash the Front Page URL 254 if ( trailingslashit( $redirect['path'] ) == trailingslashit( $user_home['path'] ) ) 255 $redirect['path'] = trailingslashit($redirect['path']); 256 257 // Ignore differences in host capitalization, as this can lead to infinite redirects 258 // Only redirect no-www <=> yes-www 259 if ( strtolower($original['host']) == strtolower($redirect['host']) || 260 ( strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host']) ) ) 261 $redirect['host'] = $original['host']; 262 263 $compare_original = array($original['host'], $original['path']); 264 265 if ( !empty( $original['port'] ) ) 266 $compare_original[] = $original['port']; 267 268 if ( !empty( $original['query'] ) ) 269 $compare_original[] = $original['query']; 270 271 $compare_redirect = array($redirect['host'], $redirect['path']); 272 273 if ( !empty( $redirect['port'] ) ) 274 $compare_redirect[] = $redirect['port']; 275 276 if ( !empty( $redirect['query'] ) ) 277 $compare_redirect[] = $redirect['query']; 278 279 if ( $compare_original !== $compare_redirect ) { 280 $redirect_url = $redirect['scheme'] . '://' . $redirect['host']; 281 if ( !empty($redirect['port']) ) 282 $redirect_url .= ':' . $redirect['port']; 283 $redirect_url .= $redirect['path']; 284 if ( !empty($redirect['query']) ) 285 $redirect_url .= '?' . $redirect['query']; 286 } 287 288 if ( $redirect_url == $requested_url ) 289 return false; 290 291 // Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE 292 $redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url); 293 294 if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request 295 return false; 296 297 if ( $do_redirect ) { 298 // protect against chained redirects 299 if ( !redirect_canonical($redirect_url, false) ) { 300 wp_redirect($redirect_url, 301); 301 exit(); 302 } else { 303 // Debug 304 // die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) ); 305 return false; 306 } 307 } else { 308 return $redirect_url; 309 } 310 } 311 312 /** 313 * Attempts to guess correct post based on query vars. 314 * 315 * @since 2.3.0 316 * @uses $wpdb 317 * 318 * @return bool|string Returns False, if it can't find post, returns correct 319 * location on success. 320 */ 321 function redirect_guess_404_permalink() { 322 global $wpdb; 323 324 if ( !get_query_var('name') ) 325 return false; 326 327 $where = $wpdb->prepare("post_name LIKE %s", get_query_var('name') . '%'); 328 329 // if any of year, monthnum, or day are set, use them to refine the query 330 if ( get_query_var('year') ) 331 $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year')); 332 if ( get_query_var('monthnum') ) 333 $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum')); 334 if ( get_query_var('day') ) 335 $where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day')); 336 337 $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'"); 338 if ( !$post_id ) 339 return false; 340 return get_permalink($post_id); 341 } 342 343 add_action('template_redirect', 'redirect_canonical'); 344 345 ?>
title
Description
Body
title
Description
Body
title
Description
Body
title
Body
| Generated: Fri Jan 8 00:19:48 2010 | Cross-referenced by PHPXref 0.7 |