Automattic\WP\Cron_Control\Events::get_events PHP Method

    public function get_events()
    {
        $events = get_option('cron');
        // That was easy
        if (!is_array($events) || empty($events)) {
            return array('events' => null);
        }
        // Simplify array format for further processing
        $events = collapse_events_array($events);
        // Select only those events to run in the next sixty seconds
        // Will include missed events as well
        $current_events = $internal_events = array();
        $current_window = strtotime(sprintf('+%d seconds', JOB_QUEUE_WINDOW_IN_SECONDS));
        foreach ($events as $event) {
            // Skip events whose time hasn't come
            if ($event['timestamp'] > $current_window) {
                continue;
            }
            // Skip events that don't have any callbacks hooked to their actions, unless their execution is requested
            if (!$this->action_has_callback_or_should_run_anyway($event)) {
                continue;
            }
            // Necessary data to identify an individual event
            // `$event['action']` is hashed to avoid information disclosure
            // Core hashes `$event['instance']` for us
            $event_data_public = array('timestamp' => $event['timestamp'], 'action' => md5($event['action']), 'instance' => $event['instance']);
            // Queue internal events separately to avoid them being blocked
            if (is_internal_event($event['action'])) {
                $internal_events[] = $event_data_public;
            } else {
                $current_events[] = $event_data_public;
            }
        }
        // Limit batch size to avoid resource exhaustion
        if (count($current_events) > JOB_QUEUE_SIZE) {
            $current_events = $this->reduce_queue($current_events);
        }
        // Combine with Internal Events and return necessary data to process the event queue
        return array('events' => array_merge($current_events, $internal_events), 'endpoint' => get_rest_url(null, REST_API::API_NAMESPACE . '/' . REST_API::ENDPOINT_RUN));
    }