+ $taxonomy = $args['taxonomy'];
+ /**
+ * Filter the taxonomy used to retrieve terms when calling get_categories().
+ *
+ * @since 2.7.0
+ *
+ * @param string $taxonomy Taxonomy to retrieve terms from.
+ * @param array $args An array of arguments. @see get_terms()
+ */
+ $taxonomy = apply_filters( 'get_categories_taxonomy', $taxonomy, $args );