Ticket #12212: query.php.diff

wp-includes/query.php

@@ -1192 +1192 @@
                         'tag__in', 'tag__not_in', 'tag__and', 'tag_slug__in', 'tag_slug__and');
 
                 foreach ( $array_keys as $key ) {
-                        if ( !isset($array[$key]))
+                        if ( !isset($array[$key])) {
+                                if ( $key == 'post__in' ) continue;
                                 $array[$key] = array();
+                        }
                 }
                 return $array;
         }
@@ -1720 +1722 @@
                 // If a post number is specified, load that post
                 if ( $q['p'] ) {
                         $where .= " AND {$wpdb->posts}.ID = " . $q['p'];
+                } elseif ( is_array($q['post__in']) && empty($q['post__in']) ) {
+                        $where = " AND {$wpdb->posts}.ID = NULL";
+                        $this->set_404();
                 } elseif ( $q['post__in'] ) {
                         $post__in = implode(',', array_map( 'absint', $q['post__in'] ));
                         $where .= " AND {$wpdb->posts}.ID IN ($post__in)";