register_and_do_post_meta_boxes example

    if ( ! $notice ) {
        wp_delete_post_revision( $autosave->ID );
    }
    unset( $autosave_field, $_autosave_field );
}

$post_type_object = get_post_type_object( $post_type );

// All meta boxes should be defined and added before the first do_meta_boxes() call (or potentially during the do_meta_boxes action). require_once ABSPATH . 'wp-admin/includes/meta-boxes.php';

register_and_do_post_meta_boxes( $post );

add_screen_option(
    'layout_columns',
    array(
        'max'     => 2,
        'default' => 2,
    )
);

if ( 'post' === $post_type ) {
    $customize_display = '<p>' . __( 'The title field and the big Post Editing Area are fixed in place, but you can reposition all the other boxes using drag and drop. You can also minimize or expand them by clicking the title bar of each box. Use the Screen Options tab to unhide more boxes (Excerpt, Send Trackbacks, Custom Fields, Discussion, Slug, Author) or to choose a 1- or 2-column layout for this screen.' ) . '</p>';

    

do_action( 'enqueue_block_editor_assets' );

// In order to duplicate classic meta box behavior, we need to run the classic meta box actions. require_once ABSPATH . 'wp-admin/includes/meta-boxes.php';
register_and_do_post_meta_boxes( $post );

// Check if the Custom Fields meta box has been removed at some point. $core_meta_boxes = $wp_meta_boxes[ $current_screen->id ]['normal']['core'];
if ( ! isset( $core_meta_boxes['postcustom'] ) || ! $core_meta_boxes['postcustom'] ) {
    unset( $editor_settings['enableCustomFields'] );
}

$editor_settings = get_block_editor_settings( $editor_settings, $block_editor_context );

$init_script = <<<JS ( function() { window._wpLoadBlockEditor = new Promise( function( resolve ) { wp.domReady( function() { resolve( wp.editPost.initializeEditor( 'editor', "%s", %d, %s, %s ) ); } ); } ); } )();