MailChimp API v3 - Subscribe via cURL/PHP

mc_subscribe.php

<?php

/**
 * @param $email
 * @param $fname
 * @param $apikey
 * @param $listid
 * @param $server - Datacenter associated with account e.g. 'us2'
 */
function mc_subscribe($email, $firstName, $apiKey, $listId, $server)
{
    $auth = base64_encode( 'user:'.$apiKey );
    $data = array(
        'apikey'        => $apiKey,
        'email_address' => $email,
        'status'        => 'subscribed',
        'merge_fields'  => array(
            'FNAME' => $firstName
        )
    );

    $jsonData = json_encode($data);
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, 'https://'.$server.'.api.mailchimp.com/3.0/lists/'.$listId.'/members/');
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json',
        'Authorization: Basic '.$auth));
    curl_setopt($ch, CURLOPT_USERAGENT, 'PHP-MCAPI/2.0');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);

    try {
        $result = curl_exec($ch);

        if($result) {
            $json = json_decode($result);
            // echo $json->{'status'};
        } else {
            // ..
        }
    } catch (Exception $e) {
        // ..
    }
};