<?php
-// Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference" by Mark Jaquith
-
-function redirect_canonical($requested_url=NULL, $do_redirect=true) {
- global $wp_rewrite, $posts, $is_IIS;
-
- if ( is_feed() || is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() )
+/**
+ * Canonical API to handle WordPress Redirecting
+ *
+ * Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference"
+ * by Mark Jaquith
+ *
+ * @author Scott Yang
+ * @author Mark Jaquith
+ * @package WordPress
+ * @since 2.3
+ */
+
+/**
+ * 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
+ * @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;
+
+ if ( is_feed() || is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() || is_robots() )
return;
if ( !$requested_url ) {
// www.example.com vs example.com
$user_home = @parse_url(get_option('home'));
- $redirect['host'] = $user_home['host'];
+ if ( isset($user_home['host']) )
+ $redirect['host'] = $user_home['host'];
// Handle ports
if ( isset($user_home['port']) )
} else {
foreach ( array('single', 'category', 'page', 'day', 'month', 'year') as $type ) {
$func = 'is_' . $type;
- if ( call_user_func($func) )
+ 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']);
$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($redirect_url, 301);
- exit();
- } else {
- return false;
- }
+ if ( !$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 {
- return $redirect_url;
+ return false;
}
} else {
- return false;
+ return $redirect_url;
}
}
+/**
+ * Attempts to guess correct post based on query vars
+ *
+ * @since 2.3
+ * @uses $wpdb
+ *
+ * @return bool|string Returns False, if it can't find post, returns correct
+ * location on success.
+ */
function redirect_guess_404_permalink() {
- global $wp_query, $wpdb;
+ global $wpdb;
if ( !get_query_var('name') )
return false;
- $where = "post_name LIKE '" . $wpdb->escape(get_query_var('name')) . "%'";
+ $where = $wpdb->prepare("post_name LIKE %s", get_query_var('name') . '%');
// if any of year, monthnum, or day are set, use them to refine the query
if ( get_query_var('year') )
- $where .= " AND YEAR(post_date) = '" . $wpdb->escape(get_query_var('year')) . "'";
+ $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year'));
if ( get_query_var('monthnum') )
- $where .= " AND MONTH(post_date) = '" . $wpdb->escape(get_query_var('monthnum')) . "'";
+ $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum'));
if ( get_query_var('day') )
- $where .= " AND DAYOFMONTH(post_date) = '" . $wpdb->escape(get_query_var('day')) . "'";
+ $where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day'));
$post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'");
if ( !$post_id )
add_action('template_redirect', 'redirect_canonical');
-?>
\ No newline at end of file
+?>
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