A PHP library for working w/ the Mailchimp API.
Normal install via Composer.
Call the desired method and pass the params as a single array.
$response = Travis\Mailchimp::list_subscribe(array(
'apikey' => 'YOUR_API_KEY',
'id' => 'YOUR_LIST_ID',
'email_address' => 'foo@bar.com',
));
Just make sure you pass all the required fields.