How can I combine two If Statements in PHP to block access to a URL?

Question

I need to block access to all URLs that doesn't contain &uuid=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

the x is random and can contain number and text.
The final code needs to have both verifications in it: if ($context->data->ticket->ohanah_event_id) and the URL check.

The Code used at the Moment is:

<?php

/**
 * @package     Ohanah
 * @copyright   Copyright (C) 2012 - 2016 Beyounic SA. All rights reserved.
 * @license     GNU GPLv3 <http://www.gnu.org/licenses/gpl.html>
 * @link        http://www.beyounic.com
 */

class ComOhanahViewTicketHtml extends ComOhanahViewHtml
{
    protected function _fetchData(KViewContext $context)
    {
        parent::_fetchData($context);

        if ($context->data->ticket->ohanah_event_id) {
            $doc = JFactory::getDocument();
            $translator = $this->getObject('translator');

            $doc->setTitle($translator->translate('COM_OHANAH_TICKET') . ' - ' . $context->data->ticket->event->title);
        }
    }
}

Answer 1

This would be something like this.. if you give me more precisions of what the uuid format will be, i can update with a better regex. Some things like if the the example shows the accurate number of x separated by -, the regex would be '/^[A-Za-z0-9]{8}-[A-Za-z0-9]{4}-[A-Za-z0-9]{4}-[A-Za-z0-9]{4}-[A-Za-z0-9]{12}$/'. (Note that theses regexes does not support accented characters)

class ComOhanahViewTicketHtml extends ComOhanahViewHtml
{
    protected function _fetchData(KViewContext $context)
    {
        parent::_fetchData($context);

        if(!isset($_GET['uuid']) || !preg_match('/^[A-Za-z0-9-]*$/', $_GET['uuid'])){
            exit('URL NOT ALLOWED!');
        }else{
            if ($context->data->ticket->ohanah_event_id) {
                $doc = JFactory::getDocument();
                $translator = $this->getObject('translator');

                $doc->setTitle($translator->translate('COM_OHANAH_TICKET') . ' - ' . $context->data->ticket->event->title);
            }
        }
    }
}

Note that if headers are not sent yet, you can add an accurate forbidden error with header('HTTP/1.0 403 Forbidden'); (simple version, you can find better ones that accept HTTPS and all)