This is only part of functions.php - You can view this file in context here: https://github.com/caseysoftware/upgrading-google-voice-with-Twilio

functions.php

<?php

// There is not the entire file, download the full package from Github.
{
    if (in_array($number, $whitelist)) {
        return true;
    }

    $currentHour = date('G');
    if (($starttime <= $currentHour) && ($currentHour < $endtime)) {
        return true;
    }

    return false;
}