metaboxes.php

<?php
/**
 * Include and setup custom metaboxes and fields. (make sure you copy this file to outside the CMB directory)
 *
 * @category YourThemeOrPlugin
 * @package  Metaboxes
 * @license  http://www.opensource.org/licenses/gpl-license.php GPL v2.0 (or later)
 * @link     https://github.com/webdevstudios/Custom-Metaboxes-and-Fields-for-WordPress
 */

/**
 * Get the bootstrap! If using the plugin from wordpress.org, REMOVE THIS!
 */
if ( file_exists(  __DIR__ . '/cmb2/init.php' ) ) {
	require_once  __DIR__ . '/cmb2/init.php';
} elseif ( file_exists(  __DIR__ . '/CMB2/init.php' ) ) {
	require_once  __DIR__ . '/CMB2/init.php';
}

/**
 * Conditionally displays a field when used as a callback in the 'show_on_cb' field parameter
 *
 * @param  CMB2_Field object $field Field object
 *
 * @return bool                     True if metabox should show
 */
function cmb2_hide_if_no_cats( $field ) {
	// Don't show this field if not in the cats category
	if ( ! has_tag( 'cats', $field->object_id ) ) {
		return false;
	}
	return true;
}

add_filter( 'cmb2_meta_boxes', 'cmb2_sample_metaboxes' );
/**
 * Define the metabox and field configurations.
 *
 * @param  array $meta_boxes
 * @return array
 */
function cmb2_sample_metaboxes( array $meta_boxes ) {

	// Start with an underscore to hide fields from custom fields list
	$prefix = '_cmb2_';


	/**
	 * Metabox to be displayed on a single page ID
	 */
	$meta_boxes['home_page_metabox'] = array(
		'id'           => 'about_page_metabox',
		'title'        => __( 'About Page Metabox', 'cmb2' ),
		'object_types' => array( 'page', ), // Post type
		'context'      => 'normal',
		'priority'     => 'high',
		'show_names'   => true, // Show field names on the left
		'show_on'      => array( 'id' => array( 2, ) ), // Specific post IDs to display this metabox
		'fields'       => array(
			array(
				'name' => __( 'Test Text', 'cmb2' ),
				'desc' => __( 'field description (optional)', 'cmb2' ),
				'id'   => $prefix . '_about_test_text',
				'type' => 'text',
			),
		)
	);


	// Add other metaboxes as needed

	return $meta_boxes;
}