Ticket #9470: 9470.diff

wp-includes/post.php

@@ -3703 +3703 @@
 
         }
 
-        if ( $parent >= 0 )
+        if ( is_array( $parent ) ) {
+                $post_parent__in = implode( ',', array_map( 'absint', (array) $parent ) );
+                if ( ! empty( $post_parent__in ) )
+                        $where .= " AND post_parent IN ($post_parent__in)";
+        } elseif ( $parent >= 0 ) {
                 $where .= $wpdb->prepare(' AND post_parent = %d ', $parent);
+        }
 
         if ( 1 == count( $post_status ) ) {
                 $where_post_type = $wpdb->prepare( "post_type = %s AND post_status = %s", $post_type, array_shift( $post_status ) );