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/wp-includes/canonical.php

https://bitbucket.org/aqge/deptandashboard
PHP | 454 lines | 309 code | 65 blank | 80 comment | 185 complexity | 0cf338ce93c60b16a0590ad654ff2447 MD5 | raw file
Possible License(s): AGPL-1.0, GPL-2.0, LGPL-2.1 
    

  1. <?php
    2. 

  2. /**
    3. 

  3.  * Canonical API to handle WordPress Redirecting
    4. 

  4.  *
    5. 

  5.  * Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference"
    6. 

  6.  * by Mark Jaquith
    7. 

  7.  *
    8. 

  8.  * @package WordPress
    9. 

  9.  * @since 2.3.0
    10. 

  10.  */
    11. 

  11. 

  12. /**
    13. 

  13.  * Redirects incoming links to the proper URL based on the site url.
    14. 

  14.  *
    15. 

  15.  * Search engines consider www.somedomain.com and somedomain.com to be two
    16. 

  16.  * different URLs when they both go to the same location. This SEO enhancement
    17. 

  17.  * prevents penalty for duplicate content by redirecting all incoming links to
    18. 

  18.  * one or the other.
    19. 

  19.  *
    20. 

  20.  * Prevents redirection for feeds, trackbacks, searches, comment popup, and
    21. 

  21.  * admin URLs. Does not redirect on IIS, page/post previews, and on form data.
    22. 

  22.  *
    23. 

  23.  * Will also attempt to find the correct link when a user enters a URL that does
    24. 

  24.  * not exist based on exact WordPress query. Will instead try to parse the URL
    25. 

  25.  * or query in an attempt to figure the correct page to go to.
    26. 

  26.  *
    27. 

  27.  * @since 2.3.0
    28. 

  28.  * @uses $wp_rewrite
    29. 

  29.  * @uses $is_IIS
    30. 

  30.  *
    31. 

  31.  * @param string $requested_url Optional. The URL that was requested, used to
    32. 

  32.  *		figure if redirect is needed.
    33. 

  33.  * @param bool $do_redirect Optional. Redirect to the new URL.
    34. 

  34.  * @return null|false|string Null, if redirect not needed. False, if redirect
    35. 

  35.  *		not needed or the string of the URL
    36. 

  36.  */
    37. 

  37. function redirect_canonical( $requested_url = null, $do_redirect = true ) {
    38. 

  38. 	global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
    39. 

  39. 

  40. 	if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || !empty($_POST) || is_preview() || is_robots() || $is_IIS )
    41. 

  41. 		return;
    42. 

  42. 

  43. 	if ( !$requested_url ) {
    44. 

  44. 		// build the URL in the address bar
    45. 

  45. 		$requested_url  = is_ssl() ? 'https://' : 'http://';
    46. 

  46. 		$requested_url .= $_SERVER['HTTP_HOST'];
    47. 

  47. 		$requested_url .= $_SERVER['REQUEST_URI'];
    48. 

  48. 	}
    49. 

  49. 

  50. 	$original = @parse_url($requested_url);
    51. 

  51. 	if ( false === $original )
    52. 

  52. 		return;
    53. 

  53. 

  54. 	// Some PHP setups turn requests for / into /index.php in REQUEST_URI
    55. 

  55. 	// See: http://trac.wordpress.org/ticket/5017
    56. 

  56. 	// See: http://trac.wordpress.org/ticket/7173
    57. 

  57. 	// Disabled, for now:
    58. 

  58. 	// $original['path'] = preg_replace('|/index\.php$|', '/', $original['path']);
    59. 

  59. 

  60. 	$redirect = $original;
    61. 

  61. 	$redirect_url = false;
    62. 

  62. 

  63. 	// Notice fixing
    64. 

  64. 	if ( !isset($redirect['path']) )
    65. 

  65. 		$redirect['path'] = '';
    66. 

  66. 	if ( !isset($redirect['query']) )
    67. 

  67. 		$redirect['query'] = '';
    68. 

  68. 

  69. 	if ( is_singular() && 1 > $wp_query->post_count && ($id = get_query_var('p')) ) {
    70. 

  70. 

  71. 		$vars = $wpdb->get_results( $wpdb->prepare("SELECT post_type, post_parent FROM $wpdb->posts WHERE ID = %d", $id) );
    72. 

  72. 

  73. 		if ( isset($vars[0]) && $vars = $vars[0] ) {
    74. 

  74. 			if ( 'revision' == $vars->post_type && $vars->post_parent > 0 )
    75. 

  75. 				$id = $vars->post_parent;
    76. 

  76. 

  77. 			if ( $redirect_url = get_permalink($id) )
    78. 

  78. 				$redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id', 'post_type'), $redirect['query']);
    79. 

  79. 		}
    80. 

  80. 	}
    81. 

  81. 

  82. 	// These tests give us a WP-generated permalink
    83. 

  83. 	if ( is_404() ) {
    84. 

  84. 

  85. 		// Redirect ?page_id, ?p=, ?attachment_id= to their respective url's
    86. 

  86. 		$id = max( get_query_var('p'), get_query_var('page_id'), get_query_var('attachment_id') );
    87. 

  87. 		if ( $id && $redirect_post = get_post($id) ) {
    88. 

  88. 			$post_type_obj = get_post_type_object($redirect_post->post_type);
    89. 

  89. 			if ( $post_type_obj->public ) {
    90. 

  90. 				$redirect_url = get_permalink($redirect_post);
    91. 

  91. 				$redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id', 'post_type'), $redirect['query']);
    92. 

  92. 			}
    93. 

  93. 		}
    94. 

  94. 

  95. 		if ( ! $redirect_url )
    96. 

  96. 			$redirect_url = redirect_guess_404_permalink();
    97. 

  97. 

  98. 	} elseif ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() ) {
    99. 

  99. 		// rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
    100. 

  100. 		if ( is_attachment() && !empty($_GET['attachment_id']) && ! $redirect_url ) {
    101. 

  101. 			if ( $redirect_url = get_attachment_link(get_query_var('attachment_id')) )
    102. 

  102. 				$redirect['query'] = remove_query_arg('attachment_id', $redirect['query']);
    103. 

  103. 		} elseif ( is_single() && !empty($_GET['p']) && ! $redirect_url ) {
    104. 

  104. 			if ( $redirect_url = get_permalink(get_query_var('p')) )
    105. 

  105. 				$redirect['query'] = remove_query_arg(array('p', 'post_type'), $redirect['query']);
    106. 

  106. 		} elseif ( is_single() && !empty($_GET['name'])  && ! $redirect_url ) {
    107. 

  107. 			if ( $redirect_url = get_permalink( $wp_query->get_queried_object_id() ) )
    108. 

  108. 				$redirect['query'] = remove_query_arg('name', $redirect['query']);
    109. 

  109. 		} elseif ( is_page() && !empty($_GET['page_id']) && ! $redirect_url ) {
    110. 

  110. 			if ( $redirect_url = get_permalink(get_query_var('page_id')) )
    111. 

  111. 				$redirect['query'] = remove_query_arg('page_id', $redirect['query']);
    112. 

  112. 		} 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 ) {
    113. 

  113. 			$redirect_url = home_url('/');
    114. 

  114. 		} 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 ) {
    115. 

  115. 			if ( $redirect_url = get_permalink(get_option('page_for_posts')) )
    116. 

  116. 				$redirect['query'] = remove_query_arg('page_id', $redirect['query']);
    117. 

  117. 		} elseif ( !empty($_GET['m']) && ( is_year() || is_month() || is_day() ) ) {
    118. 

  118. 			$m = get_query_var('m');
    119. 

  119. 			switch ( strlen($m) ) {
    120. 

  120. 				case 4: // Yearly
    121. 

  121. 					$redirect_url = get_year_link($m);
    122. 

  122. 					break;
    123. 

  123. 				case 6: // Monthly
    124. 

  124. 					$redirect_url = get_month_link( substr($m, 0, 4), substr($m, 4, 2) );
    125. 

  125. 					break;
    126. 

  126. 				case 8: // Daily
    127. 

  127. 					$redirect_url = get_day_link(substr($m, 0, 4), substr($m, 4, 2), substr($m, 6, 2));
    128. 

  128. 					break;
    129. 

  129. 			}
    130. 

  130. 			if ( $redirect_url )
    131. 

  131. 				$redirect['query'] = remove_query_arg('m', $redirect['query']);
    132. 

  132. 		// now moving on to non ?m=X year/month/day links
    133. 

  133. 		} elseif ( is_day() && get_query_var('year') && get_query_var('monthnum') && !empty($_GET['day']) ) {
    134. 

  134. 			if ( $redirect_url = get_day_link(get_query_var('year'), get_query_var('monthnum'), get_query_var('day')) )
    135. 

  135. 				$redirect['query'] = remove_query_arg(array('year', 'monthnum', 'day'), $redirect['query']);
    136. 

  136. 		} elseif ( is_month() && get_query_var('year') && !empty($_GET['monthnum']) ) {
    137. 

  137. 			if ( $redirect_url = get_month_link(get_query_var('year'), get_query_var('monthnum')) )
    138. 

  138. 				$redirect['query'] = remove_query_arg(array('year', 'monthnum'), $redirect['query']);
    139. 

  139. 		} elseif ( is_year() && !empty($_GET['year']) ) {
    140. 

  140. 			if ( $redirect_url = get_year_link(get_query_var('year')) )
    141. 

  141. 				$redirect['query'] = remove_query_arg('year', $redirect['query']);
    142. 

  142. 		} elseif ( is_author() && !empty($_GET['author']) && preg_match( '|^[0-9]+$|', $_GET['author'] ) ) {
    143. 

  143. 			$author = get_userdata(get_query_var('author'));
    144. 

  144. 			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 ) ) ) {
    145. 

  145. 				if ( $redirect_url = get_author_posts_url($author->ID, $author->user_nicename) )
    146. 

  146. 					$redirect['query'] = remove_query_arg('author', $redirect['query']);
    147. 

  147. 			}
    148. 

  148. 		} elseif ( is_category() || is_tag() || is_tax() ) { // Terms (Tags/categories)
    149. 

  149. 

  150. 			$term_count = 0;
    151. 

  151. 			foreach ( $wp_query->tax_query->queries as $tax_query )
    152. 

  152. 				$term_count += count( $tax_query['terms'] );
    153. 

  153. 

  154. 			$obj = $wp_query->get_queried_object();
    155. 

  155. 			if ( $term_count <= 1 && !empty($obj->term_id) && ( $tax_url = get_term_link((int)$obj->term_id, $obj->taxonomy) ) && !is_wp_error($tax_url) ) {
    156. 

  156. 				if ( !empty($redirect['query']) ) {
    157. 

  157. 					// Strip taxonomy query vars off the url.
    158. 

  158. 					$qv_remove = array( 'term', 'taxonomy');
    159. 

  159. 					if ( is_category() ) {
    160. 

  160. 						$qv_remove[] = 'category_name';
    161. 

  161. 						$qv_remove[] = 'cat';
    162. 

  162. 					} elseif ( is_tag() ) {
    163. 

  163. 						$qv_remove[] = 'tag';
    164. 

  164. 						$qv_remove[] = 'tag_id';
    165. 

  165. 					} else { // Custom taxonomies will have a custom query var, remove those too:
    166. 

  166. 						$tax_obj = get_taxonomy( $obj->taxonomy );
    167. 

  167. 						if ( false !== $tax_obj->query_var )
    168. 

  168. 							$qv_remove[] = $tax_obj->query_var;
    169. 

  169. 					}
    170. 

  170. 

  171. 					$rewrite_vars = array_diff( array_keys($wp_query->query), array_keys($_GET) );
    172. 

  172. 

  173. 					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
    174. 

  174. 						$redirect['query'] = remove_query_arg($qv_remove, $redirect['query']); //Remove all of the per-tax qv's
    175. 

  175. 

  176. 						// Create the destination url for this taxonomy
    177. 

  177. 						$tax_url = parse_url($tax_url);
    178. 

  178. 						if ( ! empty($tax_url['query']) ) { // Taxonomy accessible via ?taxonomy=..&term=.. or any custom qv..
    179. 

  179. 							parse_str($tax_url['query'], $query_vars);
    180. 

  180. 							$redirect['query'] = add_query_arg($query_vars, $redirect['query']);
    181. 

  181. 						} else { // Taxonomy is accessible via a "pretty-URL"
    182. 

  182. 							$redirect['path'] = $tax_url['path'];
    183. 

  183. 						}
    184. 

  184. 

  185. 					} else { // Some query vars are set via $_GET. Unset those from $_GET that exist via the rewrite
    186. 

  186. 						foreach ( $qv_remove as $_qv ) {
    187. 

  187. 							if ( isset($rewrite_vars[$_qv]) )
    188. 

  188. 								$redirect['query'] = remove_query_arg($_qv, $redirect['query']);
    189. 

  189. 						}
    190. 

  190. 					}
    191. 

  191. 				}
    192. 

  192. 

  193. 			}
    194. 

  194. 		} elseif ( is_single() && strpos($wp_rewrite->permalink_structure, '%category%') !== false ) {
    195. 

  195. 			$category = get_category_by_path(get_query_var('category_name'));
    196. 

  196. 			$post_terms = wp_get_object_terms($wp_query->get_queried_object_id(), 'category', array('fields' => 'tt_ids'));
    197. 

  197. 			if ( (!$category || is_wp_error($category)) || ( !is_wp_error($post_terms) && !empty($post_terms) && !in_array($category->term_taxonomy_id, $post_terms) ) )
    198. 

  198. 				$redirect_url = get_permalink($wp_query->get_queried_object_id());
    199. 

  199. 		}
    200. 

  200. 

  201. 		// Post Paging
    202. 

  202. 		if ( is_singular() && get_query_var('page') && $redirect_url ) {
    203. 

  203. 			$redirect_url = trailingslashit( $redirect_url ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' );
    204. 

  204. 			$redirect['query'] = remove_query_arg( 'page', $redirect['query'] );
    205. 

  205. 		}
    206. 

  206. 

  207. 		// paging and feeds
    208. 

  208. 		if ( get_query_var('paged') || is_feed() || get_query_var('cpage') ) {
    209. 

  209. 			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'] ) ) {
    210. 

  210. 				// Strip off paging and feed
    211. 

  211. 				$redirect['path'] = preg_replace("#/$wp_rewrite->pagination_base/?[0-9]+?(/+)?$#", '/', $redirect['path']); // strip off any existing paging
    212. 

  212. 				$redirect['path'] = preg_replace('#/(comments/?)?(feed|rss2?|rdf|atom)(/+|$)#', '/', $redirect['path']); // strip off feed endings
    213. 

  213. 				$redirect['path'] = preg_replace('#/comment-page-[0-9]+?(/+)?$#', '/', $redirect['path']); // strip off any existing comment paging
    214. 

  214. 			}
    215. 

  215. 

  216. 			$addl_path = '';
    217. 

  217. 			if ( is_feed() && in_array( get_query_var('feed'), $wp_rewrite->feeds ) ) {
    218. 

  218. 				$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
    219. 

  219. 				if ( get_query_var( 'withcomments' ) )
    220. 

  220. 					$addl_path .= 'comments/';
    221. 

  221. 				if ( ( 'rss' == get_default_feed() && 'feed' == get_query_var('feed') ) || 'rss' == get_query_var('feed') )
    222. 

  222. 					$addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() == 'rss2' ) ? '' : 'rss2' ), 'feed' );
    223. 

  223. 				else
    224. 

  224. 					$addl_path .= user_trailingslashit( 'feed/' . ( ( get_default_feed() ==  get_query_var('feed') || 'feed' == get_query_var('feed') ) ? '' : get_query_var('feed') ), 'feed' );
    225. 

  225. 				$redirect['query'] = remove_query_arg( 'feed', $redirect['query'] );
    226. 

  226. 			} elseif ( is_feed() && 'old' == get_query_var('feed') ) {
    227. 

  227. 				$old_feed_files = array(
    228. 

  228. 					'wp-atom.php'         => 'atom',
    229. 

  229. 					'wp-commentsrss2.php' => 'comments_rss2',
    230. 

  230. 					'wp-feed.php'         => get_default_feed(),
    231. 

  231. 					'wp-rdf.php'          => 'rdf',
    232. 

  232. 					'wp-rss.php'          => 'rss2',
    233. 

  233. 					'wp-rss2.php'         => 'rss2',
    234. 

  234. 				);
    235. 

  235. 				if ( isset( $old_feed_files[ basename( $redirect['path'] ) ] ) ) {
    236. 

  236. 					$redirect_url = get_feed_link( $old_feed_files[ basename( $redirect['path'] ) ] );
    237. 

  237. 					wp_redirect( $redirect_url, 301 );
    238. 

  238. 					die();
    239. 

  239. 				}
    240. 

  240. 			}
    241. 

  241. 

  242. 			if ( get_query_var('paged') > 0 ) {
    243. 

  243. 				$paged = get_query_var('paged');
    244. 

  244. 				$redirect['query'] = remove_query_arg( 'paged', $redirect['query'] );
    245. 

  245. 				if ( !is_feed() ) {
    246. 

  246. 					if ( $paged > 1 && !is_single() ) {
    247. 

  247. 						$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit("$wp_rewrite->pagination_base/$paged", 'paged');
    248. 

  248. 					} elseif ( !is_single() ) {
    249. 

  249. 						$addl_path = !empty( $addl_path ) ? trailingslashit($addl_path) : '';
    250. 

  250. 					}
    251. 

  251. 				} elseif ( $paged > 1 ) {
    252. 

  252. 					$redirect['query'] = add_query_arg( 'paged', $paged, $redirect['query'] );
    253. 

  253. 				}
    254. 

  254. 			}
    255. 

  255. 

  256. 			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 ) ) ) {
    257. 

  257. 				$addl_path = ( !empty( $addl_path ) ? trailingslashit($addl_path) : '' ) . user_trailingslashit( 'comment-page-' . get_query_var('cpage'), 'commentpaged' );
    258. 

  258. 				$redirect['query'] = remove_query_arg( 'cpage', $redirect['query'] );
    259. 

  259. 			}
    260. 

  260. 

  261. 			$redirect['path'] = user_trailingslashit( preg_replace('|/index.php/?$|', '/', $redirect['path']) ); // strip off trailing /index.php/
    262. 

  262. 			if ( !empty( $addl_path ) && $wp_rewrite->using_index_permalinks() && strpos($redirect['path'], '/index.php/') === false )
    263. 

  263. 				$redirect['path'] = trailingslashit($redirect['path']) . 'index.php/';
    264. 

  264. 			if ( !empty( $addl_path ) )
    265. 

  265. 				$redirect['path'] = trailingslashit($redirect['path']) . $addl_path;
    266. 

  266. 			$redirect_url = $redirect['scheme'] . '://' . $redirect['host'] . $redirect['path'];
    267. 

  267. 		}
    268. 

  268. 	}
    269. 

  269. 

  270. 	// tack on any additional query vars
    271. 

  271. 	$redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
    272. 

  272. 	if ( $redirect_url && !empty($redirect['query']) ) {
    273. 

  273. 		parse_str( $redirect['query'], $_parsed_query );
    274. 

  274. 		$redirect = @parse_url($redirect_url);
    275. 

  275. 

  276. 		if ( ! empty( $_parsed_query['name'] ) && ! empty( $redirect['query'] ) ) {
    277. 

  277. 			parse_str( $redirect['query'], $_parsed_redirect_query );
    278. 

  278. 

  279. 			if ( empty( $_parsed_redirect_query['name'] ) )
    280. 

  280. 				unset( $_parsed_query['name'] );
    281. 

  281. 		}
    282. 

  282. 

  283. 		$_parsed_query = array_map( 'rawurlencode', $_parsed_query );
    284. 

  284. 		$redirect_url = add_query_arg( $_parsed_query, $redirect_url );
    285. 

  285. 	}
    286. 

  286. 

  287. 	if ( $redirect_url )
    288. 

  288. 		$redirect = @parse_url($redirect_url);
    289. 

  289. 

  290. 	// www.example.com vs example.com
    291. 

  291. 	$user_home = @parse_url(home_url());
    292. 

  292. 	if ( !empty($user_home['host']) )
    293. 

  293. 		$redirect['host'] = $user_home['host'];
    294. 

  294. 	if ( empty($user_home['path']) )
    295. 

  295. 		$user_home['path'] = '/';
    296. 

  296. 

  297. 	// Handle ports
    298. 

  298. 	if ( !empty($user_home['port']) )
    299. 

  299. 		$redirect['port'] = $user_home['port'];
    300. 

  300. 	else
    301. 

  301. 		unset($redirect['port']);
    302. 

  302. 

  303. 	// trailing /index.php
    304. 

  304. 	$redirect['path'] = preg_replace('|/index.php/*?$|', '/', $redirect['path']);
    305. 

  305. 

  306. 	// Remove trailing spaces from the path
    307. 

  307. 	$redirect['path'] = preg_replace( '#(%20| )+$#', '', $redirect['path'] );
    308. 

  308. 

  309. 	if ( !empty( $redirect['query'] ) ) {
    310. 

  310. 		// Remove trailing spaces from certain terminating query string args
    311. 

  311. 		$redirect['query'] = preg_replace( '#((p|page_id|cat|tag)=[^&]*?)(%20| )+$#', '$1', $redirect['query'] );
    312. 

  312. 

  313. 		// Clean up empty query strings
    314. 

  314. 		$redirect['query'] = trim(preg_replace( '#(^|&)(p|page_id|cat|tag)=?(&|$)#', '&', $redirect['query']), '&');
    315. 

  315. 

  316. 		// Redirect obsolete feeds
    317. 

  317. 		$redirect['query'] = preg_replace( '#(^|&)feed=rss(&|$)#', '$1feed=rss2$3', $redirect['query'] );
    318. 

  318. 

  319. 		// Remove redundant leading ampersands
    320. 

  320. 		$redirect['query'] = preg_replace( '#^\??&*?#', '', $redirect['query'] );
    321. 

  321. 	}
    322. 

  322. 

  323. 	// strip /index.php/ when we're not using PATHINFO permalinks
    324. 

  324. 	if ( !$wp_rewrite->using_index_permalinks() )
    325. 

  325. 		$redirect['path'] = str_replace('/index.php/', '/', $redirect['path']);
    326. 

  326. 

  327. 	// trailing slashes
    328. 

  328. 	if ( is_object($wp_rewrite) && $wp_rewrite->using_permalinks() && !is_404() && (!is_front_page() || ( is_front_page() && (get_query_var('paged') > 1) ) ) ) {
    329. 

  329. 		$user_ts_type = '';
    330. 

  330. 		if ( get_query_var('paged') > 0 ) {
    331. 

  331. 			$user_ts_type = 'paged';
    332. 

  332. 		} else {
    333. 

  333. 			foreach ( array('single', 'category', 'page', 'day', 'month', 'year', 'home') as $type ) {
    334. 

  334. 				$func = 'is_' . $type;
    335. 

  335. 				if ( call_user_func($func) ) {
    336. 

  336. 					$user_ts_type = $type;
    337. 

  337. 					break;
    338. 

  338. 				}
    339. 

  339. 			}
    340. 

  340. 		}
    341. 

  341. 		$redirect['path'] = user_trailingslashit($redirect['path'], $user_ts_type);
    342. 

  342. 	} elseif ( is_front_page() ) {
    343. 

  343. 		$redirect['path'] = trailingslashit($redirect['path']);
    344. 

  344. 	}
    345. 

  345. 

  346. 	// Strip multiple slashes out of the URL
    347. 

  347. 	if ( strpos($redirect['path'], '//') > -1 )
    348. 

  348. 		$redirect['path'] = preg_replace('|/+|', '/', $redirect['path']);
    349. 

  349. 

  350. 	// Always trailing slash the Front Page URL
    351. 

  351. 	if ( trailingslashit( $redirect['path'] ) == trailingslashit( $user_home['path'] ) )
    352. 

  352. 		$redirect['path'] = trailingslashit($redirect['path']);
    353. 

  353. 

  354. 	// Ignore differences in host capitalization, as this can lead to infinite redirects
    355. 

  355. 	// Only redirect no-www <=> yes-www
    356. 

  356. 	if ( strtolower($original['host']) == strtolower($redirect['host']) ||
    357. 

  357. 		( strtolower($original['host']) != 'www.' . strtolower($redirect['host']) && 'www.' . strtolower($original['host']) != strtolower($redirect['host']) ) )
    358. 

  358. 		$redirect['host'] = $original['host'];
    359. 

  359. 

  360. 	$compare_original = array($original['host'], $original['path']);
    361. 

  361. 

  362. 	if ( !empty( $original['port'] ) )
    363. 

  363. 		$compare_original[] = $original['port'];
    364. 

  364. 

  365. 	if ( !empty( $original['query'] ) )
    366. 

  366. 		$compare_original[] = $original['query'];
    367. 

  367. 

  368. 	$compare_redirect = array($redirect['host'], $redirect['path']);
    369. 

  369. 

  370. 	if ( !empty( $redirect['port'] ) )
    371. 

  371. 		$compare_redirect[] = $redirect['port'];
    372. 

  372. 

  373. 	if ( !empty( $redirect['query'] ) )
    374. 

  374. 		$compare_redirect[] = $redirect['query'];
    375. 

  375. 

  376. 	if ( $compare_original !== $compare_redirect ) {
    377. 

  377. 		$redirect_url = $redirect['scheme'] . '://' . $redirect['host'];
    378. 

  378. 		if ( !empty($redirect['port']) )
    379. 

  379. 			$redirect_url .= ':' . $redirect['port'];
    380. 

  380. 		$redirect_url .= $redirect['path'];
    381. 

  381. 		if ( !empty($redirect['query']) )
    382. 

  382. 			$redirect_url .= '?' . $redirect['query'];
    383. 

  383. 	}
    384. 

  384. 

  385. 	if ( !$redirect_url || $redirect_url == $requested_url )
    386. 

  386. 		return false;
    387. 

  387. 

  388. 	// Hex encoded octets are case-insensitive.
    389. 

  389. 	if ( false !== strpos($requested_url, '%') ) {
    390. 

  390. 		if ( !function_exists('lowercase_octets') ) {
    391. 

  391. 			function lowercase_octets($matches) {
    392. 

  392. 				return strtolower( $matches[0] );
    393. 

  393. 			}
    394. 

  394. 		}
    395. 

  395. 		$requested_url = preg_replace_callback('|%[a-fA-F0-9][a-fA-F0-9]|', 'lowercase_octets', $requested_url);
    396. 

  396. 	}
    397. 

  397. 

  398. 	// Note that you can use the "redirect_canonical" filter to cancel a canonical redirect for whatever reason by returning FALSE
    399. 

  399. 	$redirect_url = apply_filters('redirect_canonical', $redirect_url, $requested_url);
    400. 

  400. 

  401. 	if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request
    402. 

  402. 		return false;
    403. 

  403. 

  404. 	if ( $do_redirect ) {
    405. 

  405. 		// protect against chained redirects
    406. 

  406. 		if ( !redirect_canonical($redirect_url, false) ) {
    407. 

  407. 			wp_redirect($redirect_url, 301);
    408. 

  408. 			exit();
    409. 

  409. 		} else {
    410. 

  410. 			// Debug
    411. 

  411. 			// die("1: $redirect_url<br />2: " . redirect_canonical( $redirect_url, false ) );
    412. 

  412. 			return false;
    413. 

  413. 		}
    414. 

  414. 	} else {
    415. 

  415. 		return $redirect_url;
    416. 

  416. 	}
    417. 

  417. }
    418. 

  418. 

  419. /**
    420. 

  420.  * Attempts to guess correct post based on query vars.
    421. 

  421.  *
    422. 

  422.  * @since 2.3.0
    423. 

  423.  * @uses $wpdb
    424. 

  424.  *
    425. 

  425.  * @return bool|string Returns False, if it can't find post, returns correct
    426. 

  426.  *		location on success.
    427. 

  427.  */
    428. 

  428. function redirect_guess_404_permalink() {
    429. 

  429. 	global $wpdb;
    430. 

  430. 

  431. 	if ( !get_query_var('name') )
    432. 

  432. 		return false;
    433. 

  433. 

  434. 	$where = $wpdb->prepare("post_name LIKE %s", like_escape( get_query_var('name') ) . '%');
    435. 

  435. 

  436. 	// if any of post_type, year, monthnum, or day are set, use them to refine the query
    437. 

  437. 	if ( get_query_var('post_type') )
    438. 

  438. 		$where .= $wpdb->prepare(" AND post_type = %s", get_query_var('post_type'));
    439. 

  439. 	if ( get_query_var('year') )
    440. 

  440. 		$where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year'));
    441. 

  441. 	if ( get_query_var('monthnum') )
    442. 

  442. 		$where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum'));
    443. 

  443. 	if ( get_query_var('day') )
    444. 

  444. 		$where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day'));
    445. 

  445. 

  446. 	$post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'");
    447. 

  447. 	if ( !$post_id )
    448. 

  448. 		return false;
    449. 

  449. 	return get_permalink($post_id);
    450. 

  450. }
    451. 

  451. 

  452. add_action('template_redirect', 'redirect_canonical');
    453. 

  453. 

  454. ?>
    455. 

  455.