Mailchimp Subscribe

mc-subscribe.php

<?php
/**
 * Copyright  2014 by LDiT 
 * Created by: Lennart van den Dool
 * Date: 2014-10-21
 * 
 * Free software, licensed under the BSD License
 *
 * IMPORTANT: 
 * this script is not XSS safe. If you need this you will have to implement a CSRF token. 
 * This requires setting a session, which is not possible for me without access to the frontend framework. 
 */
 
require('MailChimp.php'); //include the MailChimp class from https://github.com/drewm/mailchimp-api/ 


// == CONFIG ==
// Configure to work with your mailchimp account/mailinglist. You must change these values.

// == REQUIRED SETTINGS
define('MC_API_KEY', '[place your MailChimp api key here]');
define('MC_LIST_ID', false); //set mail list id. Run once without setting this value to print the list (with id's) of mailing lists in your account.

// == OPTIONAL SETTINGS:
//flag to determine whether we replace the interest 
//groups with the groups provided or we add the provided groups 
//to the member's interest groups (optional, defaults to true)
define('MC_REPLACE_INTERESTS', false);
//flag to control whether a double opt-in confirmation message 
//is sent, defaults to true. Abusing this may cause your account to be suspended.
define('MC_DOUBLE_OPTIN', true); 
//flag to control whether existing subscribers 
//should be updated instead of throwing an error. defaults to false.
define('MC_UPDATE_EXISTING', true); 
//if your double_optin is false and this is true, 
//we will send your lists Welcome Email if this subscribe succeeds - 
//this will *not* fire if we end up updating an existing subscriber. 
//If double_optin is true, this has no effect. defaults to false.
define('MC_SEND_WELCOME', false); 

// == logic ==
// Change below only if you know what you're doing.

if(!MC_LIST_ID) {
	header("HTTP/1.0 500 Internal Server Error");
	echo 'Application Misconfigured: missing mail list (MC_LIST_ID).'.PHP_EOL;
	showLists();
	exit;
}
header("Content-Type: application/json;");


if(!isset($_GET['email']) || empty($_GET['email'])) {
	header("HTTP/1.0 400 Bad Request");
	echo json_encode(array("error" => "Missing e-mail address"));
	exit;
}

$result = subscribe($_GET['email']);
if($result === false) {
	header("HTTP/1.0 500 Internal Server Error");
	echo json_encode(array("error" => "Invalid response from MailChimp Server. Could not JSON decode."));
	exit;
} else {
	if(isset($result['status']) && $result['status'] == 'error') {
		header("HTTP/1.0 500 Error " . $result['name']);
	}
	echo json_encode($result);
}
exit;

function subscribe($email)
{
	$MailChimp = new \Drewm\MailChimp(MC_API_KEY);
	$result = $MailChimp->call('lists/subscribe', array(
					'id'                => MC_LIST_ID,
					'email'             => array('email'=>$email),
					'merge_vars'        => array(),
					'double_optin'      => MC_DOUBLE_OPTIN,
					'update_existing'   => MC_UPDATE_EXISTING,
					'replace_interests' => MC_REPLACE_INTERESTS,
					'send_welcome'      => MC_SEND_WELCOME,
				));
	return $result;
}

function showLists()
{
	$MailChimp = new \Drewm\MailChimp(MC_API_KEY);
	$result = $MailChimp->call('lists/list');
	
	header("Content-Type: text/plain;");
	ini_set('html_errors', 0);
	
	echo "Available lists:".PHP_EOL;
	echo sprintf("   % -10s   % -10s   %s", 'ID', 'web_id', 'name') . PHP_EOL;
	foreach($result['data'] as $list) {
		echo sprintf(" # % -10s   % -10s   %s", $list['id'], $list['web_id'], $list['name']) . PHP_EOL;
	}
}