[php] Mailchimp simple api wrapper v3.0

// how to use

$apikey = 'xxx';
$listId = 'xxx';
$mailChimp = new MailChimp($apikey);

$result = $mailChimp->subscribe($listId, array(
    'email_address' => $email_address,
    'status' => 'subscribed',
    'merge_fields' => array(
        'NAME' => $name,
        'STORE' => $store,
        'RECEIPTNO' => $receipt_no,
    )
));


// class

class MailChimp
{
    private $api_key;
    private $api_endpoint = 'https://<dc>.api.mailchimp.com/3.0';
    public  $verify_ssl   = true;
    /**
     * Create a new instance
     * @param string $api_key Your MailChimp API key
     */
    public function __construct($api_key)
    {
        $this->api_key = $api_key;
        list(, $datacentre) = explode('-', $this->api_key);
        $this->api_endpoint = str_replace('<dc>', $datacentre, $this->api_endpoint);
    }

    public function subscribe($listId, $args = array())
    {
        return $this->post("/lists/$listId/members", $args, $timeout=10);
    }

    public function delete($method, $args=array(), $timeout=10)
    {
        return $this->makeRequest('delete', $method, $args, $timeout);
    }
    public function get($method, $args=array(), $timeout=10)
    {
        return $this->makeRequest('get', $method, $args, $timeout);
    }
    public function patch($method, $args=array(), $timeout=10)
    {
        return $this->makeRequest('patch', $method, $args, $timeout);
    }
    public function post($method, $args=array(), $timeout=10)
    {
        return $this->makeRequest('post', $method, $args, $timeout);
    }
    public function put($method, $args=array(), $timeout=10)
    {
        return $this->makeRequest('put', $method, $args, $timeout);
    }

    /**
     * Performs the underlying HTTP request. Not very exciting
     *
     * @param $http_verb
     * @param $method
     * @param array $args
     * @param int $timeout
     * @return bool|mixed
     * @throws Exception
     */
    private function makeRequest($http_verb, $method, $args=array(), $timeout=10)
    {
        $url = $this->api_endpoint.'/'.$method;
        $json_data = json_encode($args, JSON_FORCE_OBJECT);
        if (function_exists('curl_init') && function_exists('curl_setopt')) {
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_HTTPHEADER, array(
                'Accept: application/vnd.api+json',
                'Content-Type: application/vnd.api+json',
            ));
            curl_setopt($ch, CURLOPT_USERPWD, 'dummy:' . $this->api_key);
            curl_setopt($ch, CURLOPT_USERAGENT, 'MailChimp-API/3.0');
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, $this->verify_ssl);
            curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
            switch($http_verb) {
                case 'post':
                    curl_setopt($ch, CURLOPT_POST, true);
                    curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);
                    break;
                case 'get':
                    $query = http_build_query($args);
                    curl_setopt($ch, CURLOPT_URL, $url.'?'.$query);
                    break;
                case 'delete':
                    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
                    break;
                case 'patch':
                    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PATCH');
                    curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);
                    break;

                case 'put':
                    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
                    curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);
                    break;
            }
            $result = curl_exec($ch);
            curl_close($ch);
        } else {
            throw new \Exception("cURL support is required, but can't be found.");
        }
        return $result ? json_decode($result, true) : false;
    }
}