pocketmine\MemoryManager::init PHP Method

    private function init()
    {
        $this->memoryLimit = (int) $this->server->getProperty("memory.main-limit", 0) * 1024 * 1024;
        $defaultMemory = 1024;
        if (preg_match("/([0-9]+)([KMGkmg])/", $this->server->getConfigString("memory-limit", ""), $matches) > 0) {
            $m = (int) $matches[1];
            if ($m <= 0) {
                $defaultMemory = 0;
            } else {
                switch (strtoupper($matches[2])) {
                    case "K":
                        $defaultMemory = $m / 1024;
                        break;
                    case "M":
                        $defaultMemory = $m;
                        break;
                    case "G":
                        $defaultMemory = $m * 1024;
                        break;
                    default:
                        $defaultMemory = $m;
                        break;
                }
            }
        }
        $hardLimit = (int) $this->server->getProperty("memory.main-hard-limit", $defaultMemory);
        if ($hardLimit <= 0) {
            ini_set("memory_limit", -1);
        } else {
            ini_set("memory_limit", $hardLimit . "M");
        }
        $this->globalMemoryLimit = (int) $this->server->getProperty("memory.global-limit", 0) * 1024 * 1024;
        $this->checkRate = (int) $this->server->getProperty("memory.check-rate", 20);
        $this->continuousTrigger = (bool) $this->server->getProperty("memory.continuous-trigger", true);
        $this->continuousTriggerRate = (int) $this->server->getProperty("memory.continuous-trigger-rate", 30);
        $this->garbageCollectionPeriod = (int) $this->server->getProperty("memory.garbage-collection.period", 36000);
        $this->garbageCollectionTrigger = (bool) $this->server->getProperty("memory.garbage-collection.low-memory-trigger", true);
        $this->garbageCollectionAsync = (bool) $this->server->getProperty("memory.garbage-collection.collect-async-worker", true);
        $this->chunkLimit = (int) $this->server->getProperty("memory.max-chunks.trigger-limit", 96);
        $this->chunkCollect = (bool) $this->server->getProperty("memory.max-chunks.trigger-chunk-collect", true);
        $this->chunkTrigger = (bool) $this->server->getProperty("memory.max-chunks.low-memory-trigger", true);
        $this->chunkCache = (bool) $this->server->getProperty("memory.world-caches.disable-chunk-cache", true);
        $this->cacheTrigger = (bool) $this->server->getProperty("memory.world-caches.low-memory-trigger", true);
        gc_enable();
    }