pocketmine\MemoryManager::triggerGarbageCollector PHP Method

    public function triggerGarbageCollector()
    {
        Timings::$garbageCollectorTimer->startTiming();
        if ($this->garbageCollectionAsync) {
            $size = $this->server->getScheduler()->getAsyncTaskPoolSize();
            for ($i = 0; $i < $size; ++$i) {
                $this->server->getScheduler()->scheduleAsyncTaskToWorker(new GarbageCollectionTask(), $i);
            }
        }
        $cycles = gc_collect_cycles();
        foreach ($this->server->getLevels() as $level) {
            $level->doChunkGarbageCollection();
        }
        Timings::$garbageCollectorTimer->stopTiming();
        return $cycles;
    }