Actualziar a marca celima o trebol

functions.php

<?php add_filter( 'bulk_actions-edit-product', 'bulk_actions_actualizar_marca', 20, 1 );
function bulk_actions_actualizar_marca( $actions ) {
  $actions['actualizar_marca_celima'] = 'Actualziar marca a Celima';
  $actions['actualizar_marca_trebol'] = 'Actualziar marca a Trebol';
  return $actions;
}

add_filter( 'handle_bulk_actions-edit-product', 'handle_bulk_action_actualizar_marca', 10, 3 );
function handle_bulk_action_actualizar_marca( $redirect_to, $action, $post_ids ) {
  $processed_ids = array();
  foreach ( $post_ids as $post_id ) {
    if ( $action == 'actualizar_marca_celima' ) {
      update_post_meta($post_id, 'marca', 'celima');
    } else if ( $action == 'actualizar_marca_trebol' ) {
      update_post_meta($post_id, 'marca', 'trebol');
    }
    $processed_ids[] = $post_id;
  }

  return $redirect_to = add_query_arg( array(
    'actualizar_marca' => '1',
    'processed_count' => count( $processed_ids ),
    'processed_ids' => implode( ',', $processed_ids ),
  ), $redirect_to );

}

add_action( 'admin_notices', 'bulk_action_admin_notice' );
function bulk_action_admin_notice() {
  if ( !empty( $_REQUEST['actualizar_marca'] ) ) {
    $count = intval( $_REQUEST['processed_count'] );
    printf( '<div id="message" class="updated fade"><p>' .
        _n( 'Se actualizó %s producto.',
        'Se actualizaron %s productos.',
        $count,
        'actualizar_marca'
    ) . '</p></div>', $count );
  }
}