Adding custom fields for Register Helper Pro (PMPRO)

add-custom-checkout-fields.php

/*
Plugin Name: Register Helper Customizations
Plugin URI: http://www.paidmembershipspro.com/wp/pmpro-customizations/
Description: Register Helper Customizations
Version: 1.0.0
Author: StrangerStudios
Author URI: http://www.paidmembershipspro.com/
*/

//we have to put everything in a function called on init, so we are sure Register Helper is loaded
function my_pmprorh_init()
{
    //don't break if Register Helper is not loaded
    if(!function_exists("pmprorh_add_registration_field"))
    {
        return false;
    }
    //define the fields
    $fields = array();
    $fields[] = new PMProRH_Field(
        "shipped",                     
        "select",                     
        array(
            "label"=>"Shipped",   
            "profile"=>"only_admin", 
            "options"=>array(
            	"no"=>"NO",
            	"yes"=>"YES"
            	)));

    $fields[] = new PMProRH_Field(
        "shirtsize",                   
        "select",                  
        array(
        	"label"=>"Shirt Size",
        	"profile"=>true,
            "options"=>array(             
                "small"=>"SMALL",     
                "medium"=>"MEDIUM",
                "large"=>"LARGE",
                "xlarge"=>"X-LARGE",
                "xxlarge"=>"XX-LARGE" 
        )));
    //add the fields into a new checkout_boxes are of the checkout page
    foreach($fields as $field)
        pmprorh_add_registration_field(
            "checkout_boxes", // location on checkout page
            $field            
        );
    //that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action("init", "my_pmprorh_init");