$user = 'yourUsername'; //username
$pass = 'yourPassword'; //password
$cip = false; // force new ip here or set to false to auto
$retry_time = 30; // time to retry, on seconds
$retry_attempts = 3; // number of attempts

php dynamicip.php

composer install

require 'vendor/autoload.php';

$mail_log = true;

$to  = '[email protected]';
$subject = 'Dinamic dns status';
$from = '[email protected]';
$mail_log_success = true;
$mail_log_fail = true;

$mail_config['smtp'] = 'smtp.yourdomain.com';
$mail_config['port'] = 25;
$mail_config['username'] = 'smtpUser';
$mail_config['password'] = 'smtpPassword';