Release strong weak references on close, closes #1883

src/pocketmine/Server.php

@@ -74,7 +74,6 @@ use pocketmine\plugin\Plugin;
 use pocketmine\plugin\PluginLoadOrder;
 use pocketmine\plugin\PluginManager;
 use pocketmine\scheduler\CallbackTask;
-use pocketmine\scheduler\PHPGarbageCollectionTask;
 use pocketmine\scheduler\SendUsageTask;
 use pocketmine\scheduler\ServerScheduler;
 use pocketmine\tile\Tile;
@@ -1584,8 +1583,6 @@ class Server{
 			$this->scheduler->scheduleDelayedRepeatingTask(new CallbackTask([$this, "doLevelGC"]), $this->getProperty("chunk-gc.period-in-ticks", 600), $this->getProperty("chunk-gc.period-in-ticks", 600));
 		}
 
-		$this->scheduler->scheduleRepeatingTask(new PHPGarbageCollectionTask(), 100);
-
 		$this->enablePlugins(PluginLoadOrder::POSTWORLD);
 
 	}
@@ -1743,6 +1740,7 @@ class Server{
 	 */
 	public function shutdown(){
 		$this->isRunning = false;
+		gc_collect_cycles();
 	}
 
 	public function forceShutdown(){
@@ -1818,6 +1816,8 @@ class Server{
 
 		$this->tickProcessor();
 		$this->forceShutdown();
+
+		gc_collect_cycles();
 	}
 
 	public function checkTicks(){

src/pocketmine/entity/Entity.php

@@ -1050,6 +1050,7 @@ abstract class Entity extends Position implements Metadatable{
 			}
 			$this->getLevel()->removeEntity($this);
 			$this->despawnFromAll();
+			$this->level->release();
 		}
 	}
 

src/pocketmine/scheduler/PHPGarbageCollectionTask.php

@@ -1,30 +0,0 @@
-<?php
-
-/*
- *
- *  ____            _        _   __  __ _                  __  __ ____
- * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
- * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
- * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
- * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * @author PocketMine Team
-
- *
- *
-*/
-
-namespace pocketmine\scheduler;
-
-class PHPGarbageCollectionTask extends Task{
-
-	public function onRun($currentTicks){
-		gc_collect_cycles();
-	}
-
-}

src/pocketmine/tile/Tile.php

@@ -113,6 +113,7 @@ abstract class Tile extends Position{
 			unset(Tile::$needUpdate[$this->id]);
 			$this->getLevel()->removeTile($this);
 			$this->chunk->removeTile($this);
+			$this->level->release();
 		}
 	}