formats_dropdown example

    protected function extra_tablenav( $which ) {
        ?> <div class="alignleft actions"> <?php         if ( 'top' === $which ) {
            ob_start();

            $this->months_dropdown( $this->screen->post_type );
            $this->categories_dropdown( $this->screen->post_type );
            $this->formats_dropdown( $this->screen->post_type );

            /** * Fires before the Filter button on the Posts and Pages list tables. * * The Filter button allows sorting by date and/or category on the * Posts list table, and sorting by date on the Pages list table. * * @since 2.1.0 * @since 4.4.0 The `$post_type` parameter was added. * @since 4.6.0 The `$which` parameter was added. * * @param string $post_type The post type slug. * @param string $which The location of the extra table nav markup: * 'top' or 'bottom' for WP_Posts_List_Table, * 'bar' for WP_Media_List_Table. */