<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );

function your_prefix_register_meta_boxes( $meta_boxes ) {
    $post_type = $post_author = $post_date = '';
    $post_id   = isset( $_GET['post'] ) ? (int) $_GET['post'] : null;
    if ( $post_id ) {
        $post        = get_post( $post_id );
        $post_type   = $post->post_type;
        $post_author = $post->post_author;
        $post_date   = date( 'Y-m-d', strtotime( $post->post_date ) );
    }

    $prefix = '';

    $meta_boxes[] = array (
        'title' => esc_html__( 'Campos de filtración', 'text-domain' ),
        'id' => 'campos-de-filtracion',
        'post_types' => array(
            0 => 'noticias',
            1 => 'articulos',
            2 => 'cuentos',
            3 => 'estudios',
            4 => 'regalos',
            5 => 'encuestas',
            6 => 'ejercicios-web',
            7 => 'podcasts',
            8 => 'webcasts',
            9 => 'seminarios-web',
            10 => 'reciclados',
        ),
        'context' => 'normal',
        'priority' => 'high',
        'fields' => array(
            array (
                'id' => $prefix . 'text_sfzlrrqoz5d',
                'type' => 'text',
                'name' => esc_html__( 'Tipo de publicación', 'text-domain' ),
                'required' => 1,
                'std' => $post_type,
            ),
            array (
                'id' => $prefix . 'date_1cpjomreww5',
                'type' => 'date',
                'name' => esc_html__( 'Fecha de publicación', 'text-domain' ),
                'required' => 1,
                'std' => $post_date,
            ),
            array (
                'id' => $prefix . 'user_75nelpiq4a',
                'type' => 'user',
                'name' => esc_html__( 'Autor de la publicación', 'text-domain' ),
                'field_type' => 'select_advanced',
                'multiple' => true,
                'required' => 1,
                'std' => $post_author
            ),
        ),
    );

    return $meta_boxes;
}