event.php

<?php
namespace Bitrix\Main\Access\Event;
 
class Event extends \Bitrix\Main\Event
{
    public function isAccess(): ?bool
    {
        $isAccess = null;
        foreach ($this->getResults() as $eventResult)
        {
            /* @var EventResult $eventResult */
            if (!is_a($eventResult, EventResult::class))
            {
                continue;
            }
            if ($eventResult->getType() !== EventResult::SUCCESS)
            {
                continue;
            }
            if ($eventResult->isAccess() !== null)
            {
                $isAccess = ($isAccess === null)
                    ? $eventResult->isAccess()
                    : ($isAccess && $eventResult->isAccess());
            }
        }
        return $isAccess;
    }
}