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<title>[17553] branches/3.1/wp-includes/query.php:
  Parse the meta query again if query vars change.</title>
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<div id="msg">
<dl>
<dt>Revision</dt> <dd><a href="http://trac.wordpress.org/changeset/17553">17553</a></dd>
<dt>Author</dt> <dd>ryan</dd>
<dt>Date</dt> <dd>2011-03-24 16:08:02 +0000 (Thu, 24 Mar 2011)</dd>
</dl>

<h3>Log Message</h3>
<pre>Parse the meta query again if query vars change.  Set a global query_vars_changed flag instead of doing multiple hash creation calls. Props greuben. see <a href="http://trac.wordpress.org/ticket/16742">#16742</a> for 3.1</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches31wpincludesqueryphp">branches/3.1/wp-includes/query.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="branches31wpincludesqueryphp"></a>
<div class="modfile"><h4>Modified: branches/3.1/wp-includes/query.php (17552 => 17553)</h4>
<pre class="diff"><span>
<span class="info">--- branches/3.1/wp-includes/query.php        2011-03-24 16:07:24 UTC (rev 17552)
+++ branches/3.1/wp-includes/query.php        2011-03-24 16:08:02 UTC (rev 17553)
</span><span class="lines">@@ -1240,6 +1240,15 @@
</span><span class="cx">         var $query_vars_hash = false;
</span><span class="cx"> 
</span><span class="cx">         /**
</span><ins>+         * Whether query vars have changed since the initial parse_query() call.  Used to catch modifications to query vars made
+         * via pre_get_posts hooks.
+         *
+         * @since 3.1.1
+         * @access private
+         */
+        var $query_vars_changed = true;
+
+        /**
</ins><span class="cx">          * Resets query flags to false.
</span><span class="cx">          *
</span><span class="cx">          * The query flags are what page info WordPress was able to figure out.
</span><span class="lines">@@ -1395,6 +1404,7 @@
</span><span class="cx"> 
</span><span class="cx">                 $this-&gt;query_vars = $this-&gt;fill_query_vars($this-&gt;query_vars);
</span><span class="cx">                 $qv = &amp;$this-&gt;query_vars;
</span><ins>+                $this-&gt;query_vars_changed = true;
</ins><span class="cx"> 
</span><span class="cx">                 if ( ! empty($qv['robots']) )
</span><span class="cx">                         $this-&gt;is_robots = true;
</span><span class="lines">@@ -1627,6 +1637,9 @@
</span><span class="cx">                 if ( '404' == $qv['error'] )
</span><span class="cx">                         $this-&gt;set_404();
</span><span class="cx"> 
</span><ins>+                $this-&gt;query_vars_hash = md5( serialize( $this-&gt;query_vars ) );
+                $this-&gt;query_vars_changed = false;
+
</ins><span class="cx">                 do_action_ref_array('parse_query', array(&amp;$this));
</span><span class="cx">         }
</span><span class="cx"> 
</span><span class="lines">@@ -1685,7 +1698,7 @@
</span><span class="cx">                 }
</span><span class="cx"> 
</span><span class="cx">                 // Category stuff
</span><del>-                if ( !empty($q['cat']) &amp;&amp; '0' != $q['cat'] &amp;&amp; !$this-&gt;is_singular &amp;&amp; md5(serialize( $this-&gt;query_vars ) ) != $this-&gt;query_vars_hash ) {
</del><ins>+                if ( !empty($q['cat']) &amp;&amp; '0' != $q['cat'] &amp;&amp; !$this-&gt;is_singular &amp;&amp; $this-&gt;query_vars_changed ) {
</ins><span class="cx">                         $q['cat'] = ''.urldecode($q['cat']).'';
</span><span class="cx">                         $q['cat'] = addslashes_gpc($q['cat']);
</span><span class="cx">                         $cat_array = preg_split('/[,\s]+/', $q['cat']);
</span><span class="lines">@@ -1739,7 +1752,7 @@
</span><span class="cx">                 }
</span><span class="cx"> 
</span><span class="cx">                 // Tag stuff
</span><del>-                if ( '' != $q['tag'] &amp;&amp; !$this-&gt;is_singular &amp;&amp; md5(serialize( $this-&gt;query_vars ) ) != $this-&gt;query_vars_hash ) {
</del><ins>+                if ( '' != $q['tag'] &amp;&amp; !$this-&gt;is_singular &amp;&amp; $this-&gt;query_vars_changed ) {
</ins><span class="cx">                         if ( strpos($q['tag'], ',') !== false ) {
</span><span class="cx">                                 $tags = preg_split('/[,\s]+/', $q['tag']);
</span><span class="cx">                                 foreach ( (array) $tags as $tag ) {
</span><span class="lines">@@ -1811,8 +1824,6 @@
</span><span class="cx">                         );
</span><span class="cx">                 }
</span><span class="cx"> 
</span><del>-                $this-&gt;query_vars_hash = md5(serialize( $this-&gt;query_vars ) );
-
</del><span class="cx">                 $this-&gt;tax_query = new WP_Tax_Query( $tax_query );
</span><span class="cx">         }
</span><span class="cx"> 
</span><span class="lines">@@ -1882,8 +1893,17 @@
</span><span class="cx">                 // Shorthand.
</span><span class="cx">                 $q = &amp;$this-&gt;query_vars;
</span><span class="cx"> 
</span><ins>+                // Fill again in case pre_get_posts unset some vars.
</ins><span class="cx">                 $q = $this-&gt;fill_query_vars($q);
</span><span class="cx"> 
</span><ins>+                // Set a flag if a pre_get_posts hook changed the query vars.
+                $hash = md5( serialize( $this-&gt;query_vars ) );
+                if ( $hash != $this-&gt;query_vars_hash ) {
+                        $this-&gt;query_vars_changed = true;
+                        $this-&gt;query_vars_hash = $hash;
+                }
+                unset($hash);
+
</ins><span class="cx">                 // First let's clear some variables
</span><span class="cx">                 $distinct = '';
</span><span class="cx">                 $whichauthor = '';
</span><span class="lines">@@ -2444,6 +2464,16 @@
</span><span class="cx">                         $where .= ')';
</span><span class="cx">                 }
</span><span class="cx"> 
</span><ins>+                // Parse the meta query again if query vars have changed.
+                if ( $this-&gt;query_vars_changed ) {
+                        $meta_query_hash = md5( serialize( $q['meta_query'] ) );
+                        $_meta_query = $q['meta_query'];
+                        unset( $q['meta_query'] );
+                        _parse_meta_query( $q );
+                        if ( md5( serialize( $q['meta_query'] ) ) != $meta_query_hash &amp;&amp; is_array( $_meta_query ) )
+                                $q['meta_query'] = array_merge( $_meta_query, $q['meta_query'] );
+                }
+
</ins><span class="cx">                 if ( !empty( $q['meta_query'] ) ) {
</span><span class="cx">                         $clauses = call_user_func_array( '_get_meta_sql', array( $q['meta_query'], 'post', $wpdb-&gt;posts, 'ID', &amp;$this) );
</span><span class="cx">                         $join .= $clauses['join'];
</span></span></pre>
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