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<title>[14355] trunk/wp-includes/canonical.php: Serve a canonical redirection for 
 ?p=, ?page_id=, ?attachment_id= url's for incorrect post_types (ie.</title>
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<div id="msg">
<dl>
<dt>Revision</dt> <dd><a href="http://trac.wordpress.org/changeset/14355">14355</a></dd>
<dt>Author</dt> <dd>dd32</dd>
<dt>Date</dt> <dd>2010-05-03 00:37:11 +0000 (Mon, 03 May 2010)</dd>
</dl>

<h3>Log Message</h3>
<pre>Serve a canonical redirection for ?p=, ?page_id=, ?attachment_id= url's for incorrect post_types (ie. ?p=&lt;page_id&gt; will redirect to that page url). Fixes <a href="http://trac.wordpress.org/ticket/13125">#13125</a></pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpincludescanonicalphp">trunk/wp-includes/canonical.php</a></li>
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<h3>Diff</h3>
<a id="trunkwpincludescanonicalphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/canonical.php (14354 => 14355)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/canonical.php        2010-05-03 00:21:25 UTC (rev 14354)
+++ trunk/wp-includes/canonical.php        2010-05-03 00:37:11 UTC (rev 14355)
</span><span class="lines">@@ -81,7 +81,15 @@
</span><span class="cx"> 
</span><span class="cx">         // These tests give us a WP-generated permalink
</span><span class="cx">         if ( is_404() ) {
</span><del>-                $redirect_url = redirect_guess_404_permalink();
</del><ins>+
+                // Redirect ?page_id, ?p=, ?attachment_id= to their respective url's
+                $id = max( get_query_var('p'), get_query_var('page_id'), get_query_var('attachment_id'));
+                if ( $id &amp;&amp; $redirect_url = get_permalink($id) )
+                        $redirect['query'] = remove_query_arg(array('p', 'page_id', 'attachment_id'), $redirect['query']);
+        
+                if ( ! $redirect_url )
+                        $redirect_url = redirect_guess_404_permalink();
+
</ins><span class="cx">         } elseif ( is_object($wp_rewrite) &amp;&amp; $wp_rewrite-&gt;using_permalinks() ) {
</span><span class="cx">                 // rewriting of old ?p=X, ?m=2004, ?m=200401, ?m=20040101
</span><span class="cx">                 if ( is_attachment() &amp;&amp; !empty($_GET['attachment_id']) &amp;&amp; ! $redirect_url ) {
</span></span></pre>
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