phpdoc for canonical.php from darkdragon. fixes #5526
git-svn-id: http://svn.automattic.com/wordpress/trunk@6494 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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<?php
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// Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference" by Mark Jaquith
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/**
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* Canonical API to handle WordPress Redirecting
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*
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* Based on "Permalink Redirect" from Scott Yang and "Enforce www. Preference" by Mark Jaquith
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*
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* @author Scott Yang
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* @author Mark Jaquith
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* @package WordPress
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* @since 2.3
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*/
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function redirect_canonical($requested_url=NULL, $do_redirect=true) {
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/**
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* redirect_canonical() - Redirects incoming links to the proper URL based on the site url
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*
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* Search engines consider www.somedomain.com and somedomain.com to be two different URLs
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* when they both go to the same location. This SEO enhancement prevents penality for
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* duplicate content by redirecting all incoming links to one or the other.
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*
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* Prevents redirection for feeds, trackbacks, searches, comment popup, and admin URLs.
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* Does not redirect on IIS, page/post previews, and on form data.
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*
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* Will also attempt to find the correct link when a user enters a URL that does not exist
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* based on exact WordPress query. Will instead try to parse the URL or query in an attempt
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* to figure the correct page to go to.
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*
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* @since 2.3
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* @uses $wp_rewrite
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* @uses $is_IIS
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*
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* @param string $requested_url Optional. The URL that was requested, used to figure if redirect is needed.
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* @param bool $do_redirect Optional. Redirect to the new URL.
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* @return null|false|string Null, if redirect not needed. False, if redirect not needed or the string of the URL
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*/
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function redirect_canonical($requested_url=null, $do_redirect=true) {
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global $wp_rewrite, $is_IIS;
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if ( is_feed() || is_trackback() || is_search() || is_comments_popup() || is_admin() || $is_IIS || ( isset($_POST) && count($_POST) ) || is_preview() )
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@ -175,6 +206,14 @@ function redirect_canonical($requested_url=NULL, $do_redirect=true) {
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}
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}
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/**
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* redirect_guess_404_permalink() - Tries to guess correct post based on query vars
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*
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* @since 2.3
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* @uses $wpdb
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*
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* @return bool|string Returns False, if it can't find post, returns correct location on success.
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*/
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function redirect_guess_404_permalink() {
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global $wpdb;
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if ( !get_query_var('name') )
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