Add a Subscribe to MailChimp Newsletter Option on Your Contact Form - PHP

subscribe_mailchimp.php

<?php
// SUBSCRIBE TO MAILING LIST OPTION - ADD TO MAILCHIMP USING API
if ( $_POST['emailUpdates'] == 'Yes' )
{
	// Include Mailchimp API class
	require_once('MCAPI.class.php');
               
	// Your API Key: http://admin.mailchimp.com/account/api/
	$api = new MCAPI('YourAPIKeyHere');
               
	// Your List Unique ID: http://admin.mailchimp.com/lists/ (Click "settings")
	$list_id = "YourListIDHere";

	// Variables in your form that match up to variables on your subscriber
	// list. You might have only a single 'name' field, no fields at all, or more
	// fields that you want to sync up.
	$merge_vars = array(
		'FNAME' => $_POST['firstName'],
		'LNAME' => $_POST['lastName']
	);
               
	// SUBSCRIBE TO LIST
	if ( $api->listSubscribe($list_id, $_POST['email'], $merge_vars) === true ){
		$mailchimp_result = 'Success! Check your email to confirm sign up.';
	} else {
		$mailchimp_result = 'Error: ' . $api->errorMessage;
	}
}