Look up the label of an option for a PMPro Register Helper field.

my_get_rh_option_label.php

<?php
/**
 * Look up the label of an option for a Register Helper field.
 * @param $field_name The name of the field (user meta key)
 * @param $option_key The key of the option in the fields options array.
 * @returns The label for the field or "N/A" if none found.
 */
function my_get_rh_option_label( $field_name, $option_key ) {
	global $pmprorh_registration_fields;
	
	if ( empty( $pmprorh_registration_fields ) ) {
		return "N/A";
	}
	
	foreach( $pmprorh_registration_fields as $checkout_box ) {
		foreach( $checkout_box as $field ) {
			if( $field->name == $field_name ) {
				if ( isset( $field->options[$option_key] ) ) {
					return $field->options[$option_key];
				} else {
					return "N/A";
				}
			}
		}
	}
	
	return "N/A";
}

// Here is an example of how to use it.
/*
function my_init_test() {
	if ( !empty( $_REQUEST['test'] ) ) {
		echo my_get_rh_option_label('budget', '5000to10000');
		exit;
	}
}
add_action( 'init', 'my_init_test', 20 );
*/