Add second name and email to PMPro Checkout page and/or Profile

pmpro-second-name.php

<?php
/**
 * Plugin Name: PMPro Register Helper Examples
 * Description: Add this to your PMPro Customizations folder and then activate the plugin from your dashboard.
 * Author: pbrocks
 * Version: 1.3
 * Author URI: https://github.com/pbrocks
 * Add this to a Customizations Plugin and customize to suit your needs
 */
function initialize_pmprorh_fields1() {
	// don't break if Register Helper is not loaded
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}

	// define the fields
	$fields = array();

	// TEXT FIELD
	$fields[] = new PMProRH_Field(
		'spouse_name',
		'text',
		array(
			'label'   => 'Spouse\'s Name',
			'profile'   => true,
			'size' => 40,        // size attribute of text field
		)
	);

	// TEXT FIELD
	$fields[] = new PMProRH_Field(
		'spouse_email',
		'text',
		array(
			'label'   => 'Spouse\'s Email',
			'profile'   => true,
			'size' => 60,        // size attribute of text field
		)
	);

	foreach ( $fields as $field ) {
		pmprorh_add_registration_field(
			'checkout_boxes', // location on checkout page
			$field
		);
	}
	// that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action( 'init', 'initialize_pmprorh_fields1' );