DrewM\MailChimp\MailChimp::getLastError PHP Method

    public function getLastError()
    {
        return $this->last_error ?: false;
    }

<?php

require "../vendor/autoload.php";
use DrewM\MailChimp\MailChimp;
$MailChimp = new MailChimp('255970dd153fe7b1d83bec1478cbaa74-us11');
$result = $MailChimp->get('lists');
// Mailing List
// $list_id = '5c6bd183d4';
// Simpleblend Blog
$list_id = '53f4059701';
$result = $MailChimp->post("lists/{$list_id}/members", ['email_address' => '*****@*****.**', 'status' => 'subscribed']);
if ($MailChimp->success()) {
    print_r($result);
} else {
    echo $MailChimp->getLastError();
}
// require_once 'inc/MCAPI.class.php';
// $api = new MCAPI('[[YOUR_API_KEY]]');
// $merge_vars = array('FNAME'=>$_POST["fname"], 'LNAME'=>$_POST["lname"]);
//
// // Submit subscriber data to MailChimp
// // For parameters doc, refer to: http://apidocs.mailchimp.com/api/1.3/listsubscribe.func.php
// $retval = $api->listSubscribe( '[[YOUR_LIST_ID]]', $_POST["email"], $merge_vars, 'html', false, true );
//
// if ($api->errorCode){
//   echo "<h4>Please try again.</h4>";
//
// } else {
//   echo "<h4>Thank you, you have been added to our mailing list.</h4>";
//
// }