您可以使用views_{$this->screen->id} 筛选输入WP_List_Table::views(), 此处屏幕ID为edit-post:

function wpse_177655_views( $views ) {
    $custom = sprintf( \'<a href="%s"\', esc_url( \'edit.php?post_type=post&custom=foobar\' ) );
    if ( ! empty( $_GET[\'custom\'] ) && $_GET[\'custom\'] == \'foobar\' )
        $custom .= \' class="current"\';
    $custom .= \'>Custom</a>\';

    $views[\'custom\'] = $custom;

    return $views;
}

add_filter( \'views_edit-post\', \'wpse_177655_views\' );