<?php 
include 'lib/MailChimp.php';

use \DrewM\MailChimp\MailChimp;

$apiKey = 'apiniz';
$list_id = 'audience idniz';

$MailChimp = new MailChimp('apiniz');

$result = $MailChimp->get('lists');

if($_POST) {
    $email=$_POST['email'];
    $result = $MailChimp->post("lists/$list_id/members", [
        'email_address' => $email,
        'status'        => 'subscribed',
    ]);
    
    if ($MailChimp->success()) {
        header("Location:index.php");	
    } else {
        echo $MailChimp->getLastError();
    }
}