Ticket #38228: patch_38228.3.diff

wp-includes/media.php

@@ -1784 +1784 @@
         $output .= "
                 </div>\n";
 
-        return $output;
+        /**
+         * Filters the default gallery shortcode output after retrieving attachments.
+         *
+         * @since 4.7.0
+         *
+         * @param string $output         Gallery output
+         * @param array  $attachments    An array of attachments to display in the gallery
+         * @param string $gallery_style  Default CSS styles and opening HTML div container
+         *                               for the gallery shortcode output.
+         * @param array  $atts           An array of shortcode attributes.
+         * @param int    $instance       Unique numeric ID of this gallery shortcode instance.
+         */
+        return apply_filters( 'gallery_output', $output, $attachments, $gallery_style, $atts, $instance );
 }
 
 /**