$date_begins = '2018-08-01';
$date_end = '2018-12-31';
$interval_num = 10;
$interval_unit = 'D';

$DateInterval = new \Rundiz\DateInterval\DateInterval();
$DateInterval->date_begins = $date_begins;
$DateInterval->date_end = $date_end;
$DateInterval->setInterval($interval_num, $interval_unit);

$list_dates = $DateInterval->getTheDates();

if ($list_dates == false || !is_array($list_dates)) {
    echo "\t".'<h3>Error!</h3>'."\n";
    // Displaying the error messages from class.
    foreach ($DateInterval->getErrorMessage() as $err_msg) {
        echo "\t\t".$err_msg.'<br>'."\n";
    }
    // Or!! if you want to use your custom error message, translation please use the code below instead.
    /*foreach ($DateInterval->getErrorCodes() as $err_code) {
        // for more, please read the docblock at `getErrorCodes()` method.
        switch ($err_code) {
            case 'RDDINTV_NO_DATE_BEGINS':
                echo 'There is no begins date or invalid format.<br>'."\n";
                break;
            case 'RDDINTV_INCORRECT_DATE_BEGINS':
                echo 'The begins date value is incorrect.<br>'."\n";
                break;
            case 'RDDINTV_NO_INTERVAL_RANGE':
                echo 'Please enter interval or range in <code>setInterval()</code> method.<br>'."\n";
                break;
            default:
                echo 'Unknow error!<br>'."\n";
                break;
        }
    }*/
} else {
    foreach ($list_dates as $each_date) {
        echo "\t".$each_date.'<br>'."\n";
    }
}

$DateInterval->getTheDates('2018-10-05', '2018-11-30');