- <?php wp_dropdown_categories(array('hide_empty' => 0, 'hide_if_empty' => false, 'name' => 'parent', 'orderby' => 'name', 'taxonomy' => $taxonomy, 'selected' => $tag->parent, 'exclude_tree' => $tag->term_id, 'hierarchical' => true, 'show_option_none' => __('None'))); ?>
+ <?php
+ $dropdown_args = array(
+ 'hide_empty' => 0,
+ 'hide_if_empty' => false,
+ 'taxonomy' => $taxonomy,
+ 'name' => 'parent',
+ 'orderby' => 'name',
+ 'selected' => $tag->parent,
+ 'exclude_tree' => $tag->term_id,
+ 'hierarchical' => true,
+ 'show_option_none' => __( 'None' ),
+ );
+
+ /** This filter is documented in wp-admin/edit-tags.php */
+ $dropdown_args = apply_filters( 'taxonomy_parent_dropdown_args', $dropdown_args, $taxonomy, 'edit' );
+ wp_dropdown_categories( $dropdown_args ); ?>