diff --git a/src/pocketmine/command/defaults/ParticleCommand.php b/src/pocketmine/command/defaults/ParticleCommand.php
index d875e77016..37b31980b6 100644
--- a/src/pocketmine/command/defaults/ParticleCommand.php
+++ b/src/pocketmine/command/defaults/ParticleCommand.php
@@ -211,12 +211,12 @@ class ParticleCommand extends VanillaCommand{
 		}elseif(strpos($name, "blockcrack_") === 0){
 			$d = explode("_", $name);
 			if(count($d) === 2){
-				return new TerrainParticle(BlockFactory::get($d[1] & 0xff, $d[1] >> 12));
+				return new TerrainParticle(BlockFactory::get(((int) $d[1]) & 0xff, ((int) $d[1]) >> 12));
 			}
 		}elseif(strpos($name, "blockdust_") === 0){
 			$d = explode("_", $name);
 			if(count($d) >= 4){
-				return new DustParticle($d[1] & 0xff, $d[2] & 0xff, $d[3] & 0xff, isset($d[4]) ? $d[4] & 0xff : 255);
+				return new DustParticle(((int) $d[1]) & 0xff, ((int) $d[2]) & 0xff, ((int) $d[3]) & 0xff, isset($d[4]) ? ((int) $d[4]) & 0xff : 255);
 			}
 		}
 
diff --git a/src/pocketmine/event/entity/EntityDamageEvent.php b/src/pocketmine/event/entity/EntityDamageEvent.php
index 5ab3c65026..96b80ea651 100644
--- a/src/pocketmine/event/entity/EntityDamageEvent.php
+++ b/src/pocketmine/event/entity/EntityDamageEvent.php
@@ -74,10 +74,10 @@ class EntityDamageEvent extends EntityEvent implements Cancellable{
 
 
 	/**
-	 * @param Entity        $entity
-	 * @param int           $cause
-	 * @param float         $damage
-	 * @param float|float[] $modifiers
+	 * @param Entity  $entity
+	 * @param int     $cause
+	 * @param float   $damage
+	 * @param float[] $modifiers
 	 */
 	public function __construct(Entity $entity, int $cause, float $damage, array $modifiers = []){
 		$this->entity = $entity;
diff --git a/src/pocketmine/inventory/Inventory.php b/src/pocketmine/inventory/Inventory.php
index cf251d03ea..f605961c19 100644
--- a/src/pocketmine/inventory/Inventory.php
+++ b/src/pocketmine/inventory/Inventory.php
@@ -27,6 +27,8 @@ declare(strict_types=1);
 namespace pocketmine\inventory;
 
 use pocketmine\item\Item;
+use pocketmine\level\Level;
+use pocketmine\math\Vector3;
 use pocketmine\Player;
 
 interface Inventory{
@@ -120,6 +122,15 @@ interface Inventory{
 	 */
 	public function setContents(array $items, bool $send = true) : void;
 
+	/**
+	 * Drops the contents of the inventory into the specified Level at the specified position and clears the inventory
+	 * contents.
+	 *
+	 * @param Level   $level
+	 * @param Vector3 $position
+	 */
+	public function dropContents(Level $level, Vector3 $position) : void;
+
 	/**
 	 * @param Player|Player[] $target
 	 */
diff --git a/src/pocketmine/inventory/PlayerInventory.php b/src/pocketmine/inventory/PlayerInventory.php
index 830f3c8770..8210865fda 100644
--- a/src/pocketmine/inventory/PlayerInventory.php
+++ b/src/pocketmine/inventory/PlayerInventory.php
@@ -173,16 +173,21 @@ class PlayerInventory extends BaseInventory{
 	}
 
 	public function sendCreativeContents(){
+		//TODO: this mess shouldn't be in here
+		$holder = $this->getHolder();
+		if(!($holder instanceof Player)){
+			throw new \LogicException("Cannot send creative inventory contents to non-player inventory holder");
+		}
 		$pk = new InventoryContentPacket();
 		$pk->windowId = ContainerIds::CREATIVE;
 
-		if(!$this->getHolder()->isSpectator()){ //fill it for all gamemodes except spectator
+		if(!$holder->isSpectator()){ //fill it for all gamemodes except spectator
 			foreach(Item::getCreativeItems() as $i => $item){
 				$pk->items[$i] = clone $item;
 			}
 		}
 
-		$this->getHolder()->sendDataPacket($pk);
+		$holder->sendDataPacket($pk);
 	}
 
 	/**
diff --git a/src/pocketmine/item/Item.php b/src/pocketmine/item/Item.php
index 82c04b35df..6df7f58cf3 100644
--- a/src/pocketmine/item/Item.php
+++ b/src/pocketmine/item/Item.php
@@ -148,7 +148,7 @@ class Item implements ItemIds, \JsonSerializable{
 	}
 
 	/**
-	 * @param $index
+	 * @param int $index
 	 *
 	 * @return Item|null
 	 */
diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index 9eb5b96c78..a0c86882ef 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -678,7 +678,9 @@ class Level implements ChunkManager, Metadatable{
 	}
 
 	public function unregisterChunkLoader(ChunkLoader $loader, int $chunkX, int $chunkZ){
-		if(isset($this->chunkLoaders[$index = Level::chunkHash($chunkX, $chunkZ)][$hash = $loader->getLoaderId()])){
+		$index = Level::chunkHash($chunkX, $chunkZ);
+		$hash = $loader->getLoaderId();
+		if(isset($this->chunkLoaders[$index][$hash])){
 			unset($this->chunkLoaders[$index][$hash]);
 			unset($this->playerLoaders[$index][$hash]);
 			if(count($this->chunkLoaders[$index]) === 0){
@@ -1306,9 +1308,9 @@ class Level implements ChunkManager, Metadatable{
 	}
 
 	/**
-	 * @param $x
-	 * @param $y
-	 * @param $z
+	 * @param int $x
+	 * @param int $y
+	 * @param int $z
 	 *
 	 * @return int bitmap, (id << 4) | data
 	 */
diff --git a/src/pocketmine/level/generator/biome/BiomeSelector.php b/src/pocketmine/level/generator/biome/BiomeSelector.php
index 0af35246e0..6ff55e9ada 100644
--- a/src/pocketmine/level/generator/biome/BiomeSelector.php
+++ b/src/pocketmine/level/generator/biome/BiomeSelector.php
@@ -75,8 +75,9 @@ abstract class BiomeSelector{
 	}
 
 	/**
-	 * @param $x
-	 * @param $z
+	 * TODO: not sure on types here
+	 * @param int|float $x
+	 * @param int|float $z
 	 *
 	 * @return Biome
 	 */
diff --git a/src/pocketmine/metadata/MetadataStore.php b/src/pocketmine/metadata/MetadataStore.php
index 58e1094945..c6a9736e38 100644
--- a/src/pocketmine/metadata/MetadataStore.php
+++ b/src/pocketmine/metadata/MetadataStore.php
@@ -100,7 +100,7 @@ abstract class MetadataStore{
 	 * @param Plugin $owningPlugin
 	 */
 	public function invalidateAll(Plugin $owningPlugin){
-		/** @var $values MetadataValue[] */
+		/** @var MetadataValue[] $values */
 		foreach($this->metadataMap as $values){
 			if(isset($values[$owningPlugin])){
 				$values[$owningPlugin]->invalidate();
diff --git a/src/pocketmine/utils/Config.php b/src/pocketmine/utils/Config.php
index 353ca1e436..ff5dd2e834 100644
--- a/src/pocketmine/utils/Config.php
+++ b/src/pocketmine/utils/Config.php
@@ -265,7 +265,7 @@ class Config{
 	}
 
 	/**
-	 * @param $k
+	 * @param string $k
 	 *
 	 * @return bool|mixed
 	 */
@@ -274,15 +274,15 @@ class Config{
 	}
 
 	/**
-	 * @param $k
-	 * @param $v
+	 * @param string $k
+	 * @param mixed  $v
 	 */
 	public function __set($k, $v){
 		$this->set($k, $v);
 	}
 
 	/**
-	 * @param $k
+	 * @param string $k
 	 *
 	 * @return bool
 	 */
@@ -291,15 +291,15 @@ class Config{
 	}
 
 	/**
-	 * @param $k
+	 * @param string $k
 	 */
 	public function __unset($k){
 		$this->remove($k);
 	}
 
 	/**
-	 * @param $key
-	 * @param $value
+	 * @param string $key
+	 * @param mixed  $value
 	 */
 	public function setNested($key, $value){
 		$vars = explode(".", $key);
@@ -325,8 +325,8 @@ class Config{
 	}
 
 	/**
-	 * @param       $key
-	 * @param mixed $default
+	 * @param string $key
+	 * @param mixed  $default
 	 *
 	 * @return mixed
 	 */
@@ -377,8 +377,8 @@ class Config{
 	}
 
 	/**
-	 * @param       $k
-	 * @param mixed $default
+	 * @param string $k
+	 * @param mixed  $default
 	 *
 	 * @return bool|mixed
 	 */
@@ -409,8 +409,8 @@ class Config{
 	}
 
 	/**
-	 * @param      $k
-	 * @param bool $lowercase If set, searches Config in single-case / lowercase.
+	 * @param string $k
+	 * @param bool   $lowercase If set, searches Config in single-case / lowercase.
 	 *
 	 * @return bool
 	 */
@@ -425,7 +425,7 @@ class Config{
 	}
 
 	/**
-	 * @param $k
+	 * @param string $k
 	 */
 	public function remove($k){
 		unset($this->config[$k]);