WP_Links_List_Table::extra_tablenav( string $which )

	protected function extra_tablenav( $which ) {
		global $cat_id;

		if ( 'top' != $which )
			return;
?>
		<div class="alignleft actions">
<?php
			$dropdown_options = array(
				'selected' => $cat_id,
				'name' => 'cat_id',
				'taxonomy' => 'link_category',
				'show_option_all' => get_taxonomy( 'link_category' )->labels->all_items,
				'hide_empty' => true,
				'hierarchical' => 1,
				'show_count' => 0,
				'orderby' => 'name',
			);

			echo '<label class="screen-reader-text" for="cat_id">' . __( 'Filter by category' ) . '</label>';
			wp_dropdown_categories( $dropdown_options );
			submit_button( __( 'Filter' ), '', 'filter_action', false, array( 'id' => 'post-query-submit' ) );
?>
		</div>
<?php
	}