How to call a API using PHP CURL

function CallAPI($method, $url, $data = false)
    {
        $curl = curl_init();
        switch ($method)
        {
            case "POST":
                curl_setopt($curl, CURLOPT_POST, 1);
                if ($data)
                    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
                break;
            case "PUT":
                curl_setopt($curl, CURLOPT_PUT, 1);
                break;
            default:
                if ($data)
                    $url = sprintf("%s?%s", $url, http_build_query($data));
        }
        curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
        curl_setopt($curl, CURLOPT_USERPWD, "username:password");
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $result = curl_exec($curl);
        curl_close($curl);
        return $result;
    }
$method="POST";
    $vpdata="";
    $url="https://services.api.com/api/exportvesselphoto/570d2292f59bc58ff5de02c2c6cd3925b3655dc8/shipid:$ship_id";
    $str=CallAPI($method, $url,$vpdata);