Improved Level object deallocation

src/pocketmine/Player.php

@@ -2291,6 +2291,7 @@ class Player extends Human implements CommandSender, InventoryHolder, IPlayer{
 			$this->windowIndex = [];
 			$this->usedChunks = [];
 			$this->loadQueue = [];
+			$this->spawnPosition = null;
 			unset($this->buffer);
 		}
 

src/pocketmine/entity/Entity.php

@@ -1189,6 +1189,7 @@ abstract class Entity extends Location implements Metadatable{
 				$level->removeEntity($this);
 			}
 			$this->despawnFromAll();
+			$this->level = null;
 		}
 	}
 

src/pocketmine/level/Level.php

@@ -304,6 +304,7 @@ class Level implements ChunkManager, Metadatable{
 	}
 
 	public function close(){
+
 		if($this->getAutoSave()){
 			$this->save();
 		}
@@ -316,6 +317,7 @@ class Level implements ChunkManager, Metadatable{
 		$this->provider->close();
 		$this->provider = null;
 		$this->blockMetadata = null;
+		$this->blockCache = [];
 	}
 
 	/**

src/pocketmine/level/format/generic/BaseFullChunk.php

@@ -294,6 +294,7 @@ abstract class BaseFullChunk implements FullChunk{
 		foreach($this->getTiles() as $tile){
 			$tile->close();
 		}
+		$this->provider = null;
 		return true;
 	}
 

src/pocketmine/level/format/mcregion/McRegion.php

@@ -191,9 +191,7 @@ class McRegion extends BaseLevelProvider{
 	public function unloadChunk($x, $z, $safe = true){
 		$chunk = $this->getChunk($x, $z, false);
 		if($chunk instanceof FullChunk and $chunk->unload(false, $safe)){
-			$this->chunks[$index = Level::chunkHash($x, $z)] = null;
+			unset($this->chunks[Level::chunkHash($x, $z)]);
-
-			unset($this->chunks[$index]);
 		}
 
 		return true;

src/pocketmine/tile/Tile.php

@@ -121,6 +121,7 @@ abstract class Tile extends Position{
 			if(($level = $this->getLevel()) instanceof Level){
 				$level->removeTile($this);
 			}
+			$this->level = null;
 		}
 	}