WordPress CMB2 Group

cmb2-group.php

<?php
/**
 * Reason for CMB2 box
 */
function create_[cmb2]_group_box() {
	// Create the box.
	$cmb2 = \new_cmb2_box(
		array(
			'id'           => '[CHANGEME-id]',
			'title'        => __( '[CHANGEME-title]', '[CHANGEME-localization]' ),
			'object_types' => array(
				'page',
			),
			'context'      => 'normal',
			'priority'     => 'default',
			'show_names'   => true,
			'show_on'      => array(
				'key'   => 'page-template',
				'value' => array(
					'page-templates/[CHANGEME-page-template]',
				),
			),
		)
	);

	// Add the group field.
	$group_field = $cmb2->add_field(
		array(
			'id'          => '_[CHANGEME-id]]',
			'type'        => 'group',
			'description' => __( '', '[CHANGEME-localization]' ),
			'repeatable'  => true,
			'options'     => array(
				'group_title'    => __( 'Item {#}', '[CHANGEME-localization]' ),
				'add_button'     => __( 'Add Entry', '[CHANGEME-localization]' ),
				'remove_button'  => __( 'Remove Entry', '[CHANGEME-localization]' ),
				'sortable'       => true,
				'closed'         => true,
				'remove_confirm' => esc_html__( 'Are you sure you would like to remove this entry?', '[CHANGEME-localization]' ),
			),
		)
	);

	// Fields for the box.
	$fields = array(
		array(
			'name'        => __( '[CHANGEME-name]', '[CHANGEME-localization]' ),
			'id'          => '_[CHANGEME-id]',
			'type'        => '[CHANGEME-type]',
			'description' => __( '', '[CHANGEME-localization]' ),
		)
	);

	// Loop through the fields to add to the group.
	foreach ( $fields as $field ) {
		$cmb2->add_group_field( $group_field, $field );
	}
}