Campaign Monitor - update multi-options of custom field

cm-custom-field-values.php

/**
 *=====================================================================
 * Campaign Monitor API
 * PHP library: http://campaignmonitor.github.io/createsend-php/
 */
define('API_KEY', '');
define('LIST_ID', '');

include_once dirname(__FILE__) . "/createsend-php/csrest_lists.php";
$wrap = new CS_REST_Lists(LIST_ID, API_KEY);

$values = array(
		"Value 1",
		"Value 2",
		"Value 3",
		"Value 4",
		"Value 5",
	);

$keepExisting = false;
$result = $wrap->update_field_options('[CustomColumnName]', $values, $keepExisting);

if($result->was_successful()) {
	echo 'OK';
	var_dump($result);
} else {
	echo 'ERR CODE: '.$result->http_status_code;
	var_dump($result->response);
}