register.php

public function register()
{
    $this->event = Event::find($_POST['event_id']);
    if ( ! $this->event ) redirect_to(WS_ROOT.Event::BASE_PATH.'/');
    if ( ! $this->event->can_Register()) {
        set_flash('warning', 'This event is unavailable for registration.');
        redirect_to($this->event->get_URL());
    }

    if ($this->isCaptchaValid()) {
        set_flash('warning', 'The reCAPTCHA wasn\'t entered correctly.');
        redirect_to($this->event->get_URL());
    }

    $this->sendMail();

    set_flash('notice', 'You have successfully registered for this event.');
    $this->render('events/thank-you');
}

private function isCaptchaValid()
{
    if ( ENV !== 'production' ) {
        return true;
    }

    $recaptcha = new ReCaptcha\ReCaptcha(NEW_RECAPTCHA_PRIVATE_KEY);
    $resp = $recaptcha->verify($_POST['g-recaptcha-response'], $_SERVER['REMOTE_ADDR']);

    if ( $resp->isSuccess() ) {
      return true;
    }

    return false;
}

private function sendMail()
{
    $to = (ENV == 'production') ? $this->event->register_email : ERROR_EMAIL_TO;
    $headers = array(
  	  'From' => 'donotreply@'.Site::Current()->domain,
  	  'Subject' => 'Event Registration: '.$this->event->title
    );

    send_mail($to, $this->buildMailBody($this->event, $_POST['registration']), $headers);
}

private function buildMailBody($event, $registration)
{
    $body = 'Date: '. $event->start_datetime . "\n";

    foreach($registration as $key => $value) {
        if (is_array($value)) $value = join("\n", $value);
        $key = ucwords($key);
        $body .= $key.': '.$value."\n";
    }

    return $body;
}