diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index 191400cab..62d1a36e3 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -184,7 +184,6 @@ use pocketmine\network\mcpe\protocol\StopSoundPacket;
 use pocketmine\network\mcpe\protocol\TakeItemEntityPacket;
 use pocketmine\network\mcpe\protocol\TextPacket;
 use pocketmine\network\mcpe\protocol\TransferPacket;
-use pocketmine\network\mcpe\protocol\UnknownPacket;
 use pocketmine\network\mcpe\protocol\UpdateAttributesPacket;
 use pocketmine\network\mcpe\protocol\UpdateBlockPacket;
 use pocketmine\network\mcpe\protocol\UpdateTradePacket;
diff --git a/src/pocketmine/command/Command.php b/src/pocketmine/command/Command.php
index 38f562abb..0795665ac 100644
--- a/src/pocketmine/command/Command.php
+++ b/src/pocketmine/command/Command.php
@@ -46,11 +46,6 @@ abstract class Command{
 	/** @var string */
 	private $label;
 
-	/**
-	 * @var string[]
-	 */
-	private $aliases = [];
-
 	/**
 	 * @var string[]
 	 */
diff --git a/src/pocketmine/command/defaults/EffectCommand.php b/src/pocketmine/command/defaults/EffectCommand.php
index 76e761b38..559d5576a 100644
--- a/src/pocketmine/command/defaults/EffectCommand.php
+++ b/src/pocketmine/command/defaults/EffectCommand.php
@@ -75,7 +75,6 @@ class EffectCommand extends VanillaCommand{
 			return true;
 		}
 
-		$duration = 300;
 		$amplification = 0;
 
 		if(count($args) >= 3){
diff --git a/src/pocketmine/command/defaults/TitleCommand.php b/src/pocketmine/command/defaults/TitleCommand.php
index 1b4314722..68423c842 100644
--- a/src/pocketmine/command/defaults/TitleCommand.php
+++ b/src/pocketmine/command/defaults/TitleCommand.php
@@ -23,8 +23,6 @@ namespace pocketmine\command\defaults;
 
 use pocketmine\command\CommandSender;
 use pocketmine\event\TranslationContainer;
-use pocketmine\plugin\Plugin;
-use pocketmine\utils\TextFormat;
 
 class TitleCommand extends VanillaCommand{
 
@@ -98,5 +96,7 @@ class TitleCommand extends VanillaCommand{
 		}
 
 		$sender->sendMessage(new TranslationContainer("commands.title.success"));
+
+		return true;
 	}
 }
diff --git a/src/pocketmine/level/format/io/region/McRegion.php b/src/pocketmine/level/format/io/region/McRegion.php
index b8fe71378..5d9e29758 100644
--- a/src/pocketmine/level/format/io/region/McRegion.php
+++ b/src/pocketmine/level/format/io/region/McRegion.php
@@ -30,7 +30,6 @@ use pocketmine\level\format\io\ChunkUtils;
 use pocketmine\level\format\SubChunk;
 use pocketmine\level\generator\Generator;
 use pocketmine\level\Level;
-use pocketmine\level\LevelException;
 use pocketmine\nbt\NBT;
 use pocketmine\nbt\tag\{
 	ByteArrayTag, ByteTag, CompoundTag, IntArrayTag, IntTag, ListTag, LongTag, StringTag
diff --git a/src/pocketmine/level/format/io/region/RegionLoader.php b/src/pocketmine/level/format/io/region/RegionLoader.php
index c76278364..c98a2a34b 100644
--- a/src/pocketmine/level/format/io/region/RegionLoader.php
+++ b/src/pocketmine/level/format/io/region/RegionLoader.php
@@ -25,7 +25,6 @@ namespace pocketmine\level\format\io\region;
 
 use pocketmine\level\format\Chunk;
 use pocketmine\level\format\io\ChunkException;
-use pocketmine\level\LevelException;
 use pocketmine\utils\Binary;
 use pocketmine\utils\MainLogger;
 
diff --git a/src/pocketmine/network/mcpe/NetworkSession.php b/src/pocketmine/network/mcpe/NetworkSession.php
index 959823e1c..6bde53d41 100644
--- a/src/pocketmine/network/mcpe/NetworkSession.php
+++ b/src/pocketmine/network/mcpe/NetworkSession.php
@@ -103,7 +103,6 @@ use pocketmine\network\mcpe\protocol\StopSoundPacket;
 use pocketmine\network\mcpe\protocol\TakeItemEntityPacket;
 use pocketmine\network\mcpe\protocol\TextPacket;
 use pocketmine\network\mcpe\protocol\TransferPacket;
-use pocketmine\network\mcpe\protocol\UnknownPacket;
 use pocketmine\network\mcpe\protocol\UpdateAttributesPacket;
 use pocketmine\network\mcpe\protocol\UpdateBlockPacket;
 use pocketmine\network\mcpe\protocol\UpdateTradePacket;
diff --git a/src/pocketmine/network/mcpe/protocol/DropItemPacket.php b/src/pocketmine/network/mcpe/protocol/DropItemPacket.php
index 98fff9df9..be25e0c7b 100644
--- a/src/pocketmine/network/mcpe/protocol/DropItemPacket.php
+++ b/src/pocketmine/network/mcpe/protocol/DropItemPacket.php
@@ -24,12 +24,14 @@ namespace pocketmine\network\mcpe\protocol;
 #include <rules/DataPacket.h>
 
 
+use pocketmine\item\Item;
 use pocketmine\network\mcpe\NetworkSession;
 
 class DropItemPacket extends DataPacket{
 	const NETWORK_ID = ProtocolInfo::DROP_ITEM_PACKET;
 
 	public $type;
+	/** @var Item */
 	public $item;
 
 	public function decode(){