Paid Memberships Pro Register Helper: Add t-shirt sizes as selection

pmpro-customizations-register-helper-example.php

<?php
/*
Plugin Name: PMPro Customizations
Plugin URI: https://www.paidmembershipspro.com/wp/pmpro-customizations/
Description: Customizations for my Paid Memberships Pro Setup
Version: .1
Author: Paid Memberships Pro
Author URI: https://www.paidmembershipspro.com
*/
 
//Now start placing your customization code below this line

/**
 * This adds fields to your Paid Memberships Pro checkout and profile page.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * www.paidmembershipspro.com
 */

function my_pmprorh_init()
{
	//don't break if Register Helper is not loaded
	if(!function_exists( 'pmprorh_add_registration_field' )) {
		return false;
	}
	$fields = array();

	$fields[] = new PMProRH_Field(
		'tshirtsize',
		'select',
		array(
			'label' => 'T Shirt Size',
			'options' => array(
				''      => '- Select -',      
				'small' => 'Small', 
				'medium'=> 'Medium', 
				'large'=> 'Large',
				'xlarge'=> 'X-Large',
			),
			'required' => true,
			'profile' => true,
			// 'memberslistcsv' => true, /* Uncomment to include in Memberlist CSV */
			// "addmember" => true, /* Uncomment if using the Admin Add Member plugin */
		)
	);

	//add the fields into a new checkout_boxes are of the checkout page
	foreach($fields as $field)
		pmprorh_add_registration_field(
			'checkout_boxes',				// location on checkout page
			$field						// PMProRH_Field object
		);
	//that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action( 'init', 'my_pmprorh_init' );