diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 000000000..6fab79718
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,36 @@
+## Introduction
+<!-- Explain existing problems or why this pull request is necessary -->
+
+### Relevant issues
+<!-- List relevant issues here -->
+<!--
+
+* Fixes #1
+* Fixes #2
+
+-->
+
+## Changes
+### API changes
+<!-- Any additions to the API that should be documented in release notes? -->
+
+### Behavioural changes
+<!-- Any change in how the server behaves, or its performance? -->
+
+## Backwards compatibility
+<!-- Any possible backwards incompatible changes? How are they solved, or how can they be solved? -->
+
+## Follow-up
+<!-- Suggest any actions to be done before/after merging this pull request -->
+<!--
+
+Requires translations:
+
+| Name | Value in eng.ini |
+| :--: | :---: |
+| `foo.bar` | `Foo bar` |
+
+-->
+
+## Tests
+<!-- Attach scripts or actions to test this pull request, as well as the result -->
diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index 6cf12c859..b4886852e 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -1335,7 +1335,7 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 	public function sendSettings(){
 		$pk = new AdventureSettingsPacket();
 		$pk->flags = 0;
-		$pk->worldImmutable = $this->isAdventure();
+		$pk->worldImmutable = $this->isSpectator();
 		$pk->autoJump = $this->autoJump;
 		$pk->allowFlight = $this->allowFlight;
 		$pk->noClip = $this->isSpectator();
@@ -1582,6 +1582,15 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 						$this->teleport($ev->getTo());
 					}else{
 						$this->level->addEntityMovement($this->x >> 4, $this->z >> 4, $this->getId(), $this->x, $this->y + $this->getEyeHeight(), $this->z, $this->yaw, $this->pitch, $this->yaw);
+
+						$distance = $from->distance($to);
+
+						//TODO: check swimming (adds 0.015 exhaustion in MCPE)
+						if($this->isSprinting()){
+							$this->exhaust(0.1 * $distance, PlayerExhaustEvent::CAUSE_SPRINTING);
+						}else{
+							$this->exhaust(0.01 * $distance, PlayerExhaustEvent::CAUSE_WALKING);
+						}
 					}
 				}
 			}
@@ -2693,9 +2702,13 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 				$this->deadTicks = 0;
 				$this->noDamageTicks = 60;
 
+				$this->removeAllEffects();
 				$this->setHealth($this->getMaxHealth());
 
-				$this->removeAllEffects();
+				foreach($this->attributeMap->getAll() as $attr){
+					$attr->resetToDefault();
+				}
+
 				$this->sendData($this);
 
 				$this->sendSettings();
@@ -2706,6 +2719,7 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 				$this->scheduleUpdate();
 				break;
 			case PlayerActionPacket::ACTION_JUMP:
+				$this->jump();
 				return true;
 			case PlayerActionPacket::ACTION_START_SPRINT:
 				$ev = new PlayerToggleSprintEvent($this, true);
@@ -3561,7 +3575,7 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 	 * @param string $reason  Reason showed in console
 	 * @param bool   $notify
 	 */
-	public final function close($message = "", $reason = "generic reason", $notify = true){
+	final public function close($message = "", $reason = "generic reason", $notify = true){
 		if($this->connected and !$this->closed){
 			if($notify and strlen((string) $reason) > 0){
 				$pk = new DisconnectPacket();
@@ -3704,6 +3718,17 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 			return;
 		}
 
+		parent::kill();
+
+		$pk = new RespawnPacket();
+		$pos = $this->getSpawn();
+		$pk->x = $pos->x;
+		$pk->y = $pos->y;
+		$pk->z = $pos->z;
+		$this->dataPacket($pk);
+	}
+
+	protected function callDeathEvent(){
 		$message = "death.attack.generic";
 
 		$params = [
@@ -3813,10 +3838,9 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 				break;
 
 			default:
+				break;
 		}
 
-		Entity::kill();
-
 		$this->server->getPluginManager()->callEvent($ev = new PlayerDeathEvent($this, $this->getDrops(), new TranslationContainer($message, $params)));
 
 		if(!$ev->getKeepInventory()){
@@ -3834,13 +3858,6 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 		if($ev->getDeathMessage() != ""){
 			$this->server->broadcast($ev->getDeathMessage(), Server::BROADCAST_CHANNEL_USERS);
 		}
-
-		$pk = new RespawnPacket();
-		$pos = $this->getSpawn();
-		$pk->x = $pos->x;
-		$pk->y = $pos->y;
-		$pk->z = $pos->z;
-		$this->dataPacket($pk);
 	}
 
 	public function attack($damage, EntityDamageEvent $source){
diff --git a/src/pocketmine/command/Command.php b/src/pocketmine/command/Command.php
index 07347c557..189a3b03b 100644
--- a/src/pocketmine/command/Command.php
+++ b/src/pocketmine/command/Command.php
@@ -132,7 +132,7 @@ abstract class Command{
 	 *
 	 * @return mixed
 	 */
-	public abstract function execute(CommandSender $sender, $commandLabel, array $args);
+	abstract public function execute(CommandSender $sender, $commandLabel, array $args);
 
 	/**
 	 * @return string
diff --git a/src/pocketmine/command/PluginCommand.php b/src/pocketmine/command/PluginCommand.php
index 05c01fcc0..eb5fe1dc7 100644
--- a/src/pocketmine/command/PluginCommand.php
+++ b/src/pocketmine/command/PluginCommand.php
@@ -70,7 +70,7 @@ class PluginCommand extends Command implements PluginIdentifiableCommand{
 	 * @param CommandExecutor $executor
 	 */
 	public function setExecutor(CommandExecutor $executor){
-		$this->executor = ($executor != null) ? $executor : $this->owningPlugin;
+		$this->executor = $executor;
 	}
 
 	/**
diff --git a/src/pocketmine/entity/Attribute.php b/src/pocketmine/entity/Attribute.php
index be5a6cfae..c48534c63 100644
--- a/src/pocketmine/entity/Attribute.php
+++ b/src/pocketmine/entity/Attribute.php
@@ -165,6 +165,10 @@ class Attribute{
 		return $this;
 	}
 
+	public function resetToDefault(){
+		$this->setValue($this->getDefaultValue());
+	}
+
 	public function getValue(){
 		return $this->currentValue;
 	}
diff --git a/src/pocketmine/entity/AttributeMap.php b/src/pocketmine/entity/AttributeMap.php
index cdf821c52..b74492f08 100644
--- a/src/pocketmine/entity/AttributeMap.php
+++ b/src/pocketmine/entity/AttributeMap.php
@@ -38,6 +38,9 @@ class AttributeMap implements \ArrayAccess{
 		return $this->attributes[$id] ?? null;
 	}
 
+	/**
+	 * @return Attribute[]
+	 */
 	public function getAll(): array{
 		return $this->attributes;
 	}
diff --git a/src/pocketmine/entity/Entity.php b/src/pocketmine/entity/Entity.php
index d7f6e939a..cb6ff661e 100644
--- a/src/pocketmine/entity/Entity.php
+++ b/src/pocketmine/entity/Entity.php
@@ -373,6 +373,7 @@ abstract class Entity extends Location implements Metadatable{
 		$this->invulnerable = $this->namedtag["Invulnerable"] > 0 ? true : false;
 
 		$this->attributeMap = new AttributeMap();
+		$this->addAttributes();
 
 		$this->chunk->addEntity($this);
 		$this->level->addEntity($this);
@@ -710,8 +711,6 @@ abstract class Entity extends Location implements Metadatable{
 
 		$this->scheduleUpdate();
 
-		$this->addAttributes();
-
 		if(isset($this->namedtag->ActiveEffects)){
 			foreach($this->namedtag->ActiveEffects->getValue() as $e){
 				$amplifier = $e["Amplifier"] & 0xff; //0-255 only
@@ -1179,7 +1178,7 @@ abstract class Entity extends Location implements Metadatable{
 		//return !($this instanceof Player);
 	}
 
-	public final function scheduleUpdate(){
+	final public function scheduleUpdate(){
 		$this->level->updateEntities[$this->id] = $this;
 	}
 
diff --git a/src/pocketmine/entity/Human.php b/src/pocketmine/entity/Human.php
index 732dd23f8..5d8db656c 100644
--- a/src/pocketmine/entity/Human.php
+++ b/src/pocketmine/entity/Human.php
@@ -99,6 +99,15 @@ class Human extends Creature implements ProjectileSource, InventoryHolder{
 		$this->skinId = $skinId;
 	}
 
+	public function jump(){
+		parent::jump();
+		if($this->isSprinting()){
+			$this->exhaust(0.8, PlayerExhaustEvent::CAUSE_SPRINT_JUMPING);
+		}else{
+			$this->exhaust(0.2, PlayerExhaustEvent::CAUSE_JUMPING);
+		}
+	}
+
 	public function getFood() : float{
 		return $this->attributeMap->getAttribute(Attribute::HUNGER)->getValue();
 	}
@@ -355,31 +364,35 @@ class Human extends Creature implements ProjectileSource, InventoryHolder{
 		if($this->isAlive()){
 			$food = $this->getFood();
 			$health = $this->getHealth();
-			if($food >= 18){
-				$this->foodTickTimer++;
-				if($this->foodTickTimer >= 80 and $health < $this->getMaxHealth()){
-					$this->heal(1, new EntityRegainHealthEvent($this, 1, EntityRegainHealthEvent::CAUSE_SATURATION));
-					$this->exhaust(3.0, PlayerExhaustEvent::CAUSE_HEALTH_REGEN);
-					$this->foodTickTimer = 0;
+			$difficulty = $this->server->getDifficulty();
 
+			$this->foodTickTimer++;
+			if($this->foodTickTimer >= 80){
+				$this->foodTickTimer = 0;
+			}
+
+			if($difficulty === 0 and $this->foodTickTimer % 10 === 0){ //Peaceful
+				if($food < 20){
+					$this->addFood(1.0);
 				}
-			}elseif($food === 0){
-				$this->foodTickTimer++;
-				if($this->foodTickTimer >= 80){
-					$diff = $this->server->getDifficulty();
-					$can = false;
-					if($diff === 1){
-						$can = $health > 10;
-					}elseif($diff === 2){
-						$can = $health > 1;
-					}elseif($diff === 3){
-						$can = true;
+				if($this->foodTickTimer % 20 === 0 and $health < $this->getMaxHealth()){
+					$this->heal(1, new EntityRegainHealthEvent($this, 1, EntityRegainHealthEvent::CAUSE_SATURATION));
+				}
+			}
+
+			if($this->foodTickTimer === 0){
+				if($food >= 18){
+					if($health < $this->getMaxHealth()){
+						$this->heal(1, new EntityRegainHealthEvent($this, 1, EntityRegainHealthEvent::CAUSE_SATURATION));
+						$this->exhaust(3.0, PlayerExhaustEvent::CAUSE_HEALTH_REGEN);
 					}
-					if($can){
+				}elseif($food <= 0){
+					if(($difficulty === 1 and $health > 10) or ($difficulty === 2 and $health > 1) or $difficulty === 3){
 						$this->attack(1, new EntityDamageEvent($this, EntityDamageEvent::CAUSE_STARVATION, 1));
 					}
 				}
 			}
+
 			if($food <= 6){
 				if($this->isSprinting()){
 					$this->setSprinting(false);
diff --git a/src/pocketmine/entity/Living.php b/src/pocketmine/entity/Living.php
index fbdac34e5..e45131d38 100644
--- a/src/pocketmine/entity/Living.php
+++ b/src/pocketmine/entity/Living.php
@@ -43,6 +43,8 @@ abstract class Living extends Entity implements Damageable{
 
 	protected $invisible = false;
 
+	protected $jumpVelocity = 0.42;
+
 	protected function initEntity(){
 		parent::initEntity();
 
@@ -68,7 +70,7 @@ abstract class Living extends Entity implements Damageable{
 	public function setHealth($amount){
 		$wasAlive = $this->isAlive();
 		parent::setHealth($amount);
-		$this->attributeMap->getAttribute(Attribute::HEALTH)->setValue($this->getHealth());
+		$this->attributeMap->getAttribute(Attribute::HEALTH)->setValue($this->getHealth(), true);
 		if($this->isAlive() and !$wasAlive){
 			$pk = new EntityEventPacket();
 			$pk->eid = $this->getId();
@@ -98,7 +100,7 @@ abstract class Living extends Entity implements Damageable{
 		$this->namedtag->Health = new ShortTag("Health", $this->getHealth());
 	}
 
-	public abstract function getName();
+	abstract public function getName();
 
 	public function hasLineOfSight(Entity $entity){
 		//TODO: head height
@@ -115,6 +117,23 @@ abstract class Living extends Entity implements Damageable{
 		$this->attackTime = 0;
 	}
 
+	/**
+	 * Returns the initial upwards velocity of a jumping entity in blocks/tick, including additional velocity due to effects.
+	 * @return float
+	 */
+	public function getJumpVelocity() : float{
+		return $this->jumpVelocity + ($this->hasEffect(Effect::JUMP) ? (($this->getEffect(Effect::JUMP)->getAmplifier() + 1) / 10) : 0);
+	}
+
+	/**
+	 * Called when the entity jumps from the ground. This method adds upwards velocity to the entity.
+	 */
+	public function jump(){
+		if($this->onGround){
+			$this->motionY = $this->getJumpVelocity(); //Y motion should already be 0 if we're jumping from the ground.
+		}
+	}
+
 	public function attack($damage, EntityDamageEvent $source){
 		if($this->attackTime > 0 or $this->noDamageTicks > 0){
 			$lastCause = $this->getLastDamageCause();
@@ -183,6 +202,10 @@ abstract class Living extends Entity implements Damageable{
 			return;
 		}
 		parent::kill();
+		$this->callDeathEvent();
+	}
+
+	protected function callDeathEvent(){
 		$this->server->getPluginManager()->callEvent($ev = new EntityDeathEvent($this, $this->getDrops()));
 		foreach($ev->getDrops() as $item){
 			$this->getLevel()->dropItem($this, $item);
diff --git a/src/pocketmine/entity/Squid.php b/src/pocketmine/entity/Squid.php
index becc8cfc2..50a398360 100644
--- a/src/pocketmine/entity/Squid.php
+++ b/src/pocketmine/entity/Squid.php
@@ -43,8 +43,8 @@ class Squid extends WaterAnimal implements Ageable{
 	private $switchDirectionTicker = 0;
 
 	public function initEntity(){
+		$this->setMaxHealth(10);
 		parent::initEntity();
-		$this->setMaxHealth(5);
 	}
 
 	public function getName(){
diff --git a/src/pocketmine/event/player/PlayerExhaustEvent.php b/src/pocketmine/event/player/PlayerExhaustEvent.php
index 623b5fdf4..747988fb5 100644
--- a/src/pocketmine/event/player/PlayerExhaustEvent.php
+++ b/src/pocketmine/event/player/PlayerExhaustEvent.php
@@ -34,19 +34,21 @@ class PlayerExhaustEvent extends PlayerEvent implements Cancellable{
 	const CAUSE_HEALTH_REGEN = 4;
 	const CAUSE_POTION = 5;
 	const CAUSE_WALKING = 6;
-	const CAUSE_SNEAKING = 7;
+	const CAUSE_SPRINTING = 7;
 	const CAUSE_SWIMMING = 8;
-	const CAUSE_JUMPING = 10;
+	const CAUSE_JUMPING = 9;
+	const CAUSE_SPRINT_JUMPING = 10;
 	const CAUSE_CUSTOM = 11;
 
-	const CAUSE_FLAG_SPRINT = 0x10000;
-
 	/** @var float */
 	private $amount;
+	/** @var int */
+	private $cause;
 
 	public function __construct(Human $human, float $amount, int $cause){
 		$this->player = $human;
 		$this->amount = $amount;
+		$this->cause = $cause;
 	}
 
 	/**
@@ -63,4 +65,12 @@ class PlayerExhaustEvent extends PlayerEvent implements Cancellable{
 	public function setAmount(float $amount){
 		$this->amount = $amount;
 	}
+
+	/**
+	 * Returns an int cause of the exhaustion - one of the constants at the top of this class.
+	 * @return int
+	 */
+	public function getCause() : int{
+		return $this->cause;
+	}
 }
diff --git a/src/pocketmine/item/Item.php b/src/pocketmine/item/Item.php
index 7cc94878c..2305a836c 100644
--- a/src/pocketmine/item/Item.php
+++ b/src/pocketmine/item/Item.php
@@ -685,7 +685,7 @@ class Item implements ItemIds, \JsonSerializable{
 	}
 
 	public function setLore(array $lines){
-		$tag = $this->getNamedTag();
+		$tag = $this->getNamedTag() ?? new CompoundTag("", []);
 		if(!isset($tag->display)){
 			$tag->display = new CompoundTag("display", []);
 		}
@@ -945,7 +945,7 @@ class Item implements ItemIds, \JsonSerializable{
 	 *
 	 * @return bool
 	 */
-	public final function equals(Item $item, bool $checkDamage = true, bool $checkCompound = true) : bool{
+	final public function equals(Item $item, bool $checkDamage = true, bool $checkCompound = true) : bool{
 		if($this->id === $item->getId() and ($checkDamage === false or $this->getDamage() === $item->getDamage())){
 			if($checkCompound){
 				if($item->getCompoundTag() === $this->getCompoundTag()){
@@ -971,7 +971,7 @@ class Item implements ItemIds, \JsonSerializable{
 	 *
 	 * @return bool
 	 */
-	public final function deepEquals(Item $item, bool $checkDamage = true, bool $checkCompound = true) : bool{
+	final public function deepEquals(Item $item, bool $checkDamage = true, bool $checkCompound = true) : bool{
 		return $this->equals($item, $checkDamage, $checkCompound);
 	}
 
diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index 0abe8ff61..e3e00e723 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -1544,6 +1544,25 @@ class Level implements ChunkManager, Metadatable{
 					$ev->setCancelled();
 				}
 			}
+
+			if($player->isAdventure(true) and !$ev->isCancelled()){
+				$tag = $item->getNamedTagEntry("CanDestroy");
+				$canBreak = false;
+				if($tag instanceof ListTag){
+					foreach($tag as $v){
+						if($v instanceof StringTag){
+							$entry = Item::fromString($v->getValue());
+							if($entry->getId() > 0 and $entry->getBlock() !== null and $entry->getBlock()->getId() === $target->getId()){
+								$canBreak = true;
+								break;
+							}
+						}
+					}
+				}
+
+				$ev->setCancelled(!$canBreak);
+			}
+
 			$this->server->getPluginManager()->callEvent($ev);
 			if($ev->isCancelled()){
 				return false;
@@ -1589,24 +1608,6 @@ class Level implements ChunkManager, Metadatable{
 			}
 		}
 
-		$tag = $item->getNamedTagEntry("CanDestroy");
-		if($tag instanceof ListTag){
-			$canBreak = false;
-			foreach($tag as $v){
-				if($v instanceof StringTag){
-					$entry = Item::fromString($v->getValue());
-					if($entry->getId() > 0 and $entry->getBlock() !== null and $entry->getBlock()->getId() === $target->getId()){
-						$canBreak = true;
-						break;
-					}
-				}
-			}
-
-			if(!$canBreak){
-				return false;
-			}
-		}
-
 		if($createParticles){
 			$this->addParticle(new DestroyBlockParticle($target->add(0.5, 0.5, 0.5), $target));
 		}
@@ -1681,6 +1682,25 @@ class Level implements ChunkManager, Metadatable{
 					$ev->setCancelled();
 				}
 			}
+
+			if($player->isAdventure(true) and !$ev->isCancelled()){
+				$canPlace = false;
+				$tag = $item->getNamedTagEntry("CanPlaceOn");
+				if($tag instanceof ListTag){
+					foreach($tag as $v){
+						if($v instanceof StringTag){
+							$entry = Item::fromString($v->getValue());
+							if($entry->getId() > 0 and $entry->getBlock() !== null and $entry->getBlock()->getId() === $target->getId()){
+								$canPlace = true;
+								break;
+							}
+						}
+					}
+				}
+
+				$ev->setCancelled(!$canPlace);
+			}
+
 			$this->server->getPluginManager()->callEvent($ev);
 			if(!$ev->isCancelled()){
 				$target->onUpdate(self::BLOCK_UPDATE_TOUCH);
@@ -1743,24 +1763,6 @@ class Level implements ChunkManager, Metadatable{
 			}
 		}
 
-		$tag = $item->getNamedTagEntry("CanPlaceOn");
-		if($tag instanceof ListTag){
-			$canPlace = false;
-			foreach($tag as $v){
-				if($v instanceof StringTag){
-					$entry = Item::fromString($v->getValue());
-					if($entry->getId() > 0 and $entry->getBlock() !== null and $entry->getBlock()->getId() === $target->getId()){
-						$canPlace = true;
-						break;
-					}
-				}
-			}
-
-			if(!$canPlace){
-				return false;
-			}
-		}
-
 
 		if($player !== null){
 			$ev = new BlockPlaceEvent($player, $hand, $block, $target, $item);
diff --git a/src/pocketmine/level/format/io/region/Anvil.php b/src/pocketmine/level/format/io/region/Anvil.php
index 9b48a2830..084126b5f 100644
--- a/src/pocketmine/level/format/io/region/Anvil.php
+++ b/src/pocketmine/level/format/io/region/Anvil.php
@@ -101,7 +101,7 @@ class Anvil extends McRegion{
 	public function nbtDeserialize(string $data){
 		$nbt = new NBT(NBT::BIG_ENDIAN);
 		try{
-			$nbt->readCompressed($data, ZLIB_ENCODING_DEFLATE);
+			$nbt->readCompressed($data);
 
 			$chunk = $nbt->getData();
 
diff --git a/src/pocketmine/level/format/io/region/McRegion.php b/src/pocketmine/level/format/io/region/McRegion.php
index 07563c8ab..bf342a705 100644
--- a/src/pocketmine/level/format/io/region/McRegion.php
+++ b/src/pocketmine/level/format/io/region/McRegion.php
@@ -126,7 +126,7 @@ class McRegion extends BaseLevelProvider{
 	public function nbtDeserialize(string $data){
 		$nbt = new NBT(NBT::BIG_ENDIAN);
 		try{
-			$nbt->readCompressed($data, ZLIB_ENCODING_DEFLATE);
+			$nbt->readCompressed($data);
 
 			$chunk = $nbt->getData();
 
diff --git a/src/pocketmine/level/format/io/region/PMAnvil.php b/src/pocketmine/level/format/io/region/PMAnvil.php
index cb28cb17f..9ec30c203 100644
--- a/src/pocketmine/level/format/io/region/PMAnvil.php
+++ b/src/pocketmine/level/format/io/region/PMAnvil.php
@@ -104,7 +104,7 @@ class PMAnvil extends Anvil{
 	public function nbtDeserialize(string $data){
 		$nbt = new NBT(NBT::BIG_ENDIAN);
 		try{
-			$nbt->readCompressed($data, ZLIB_ENCODING_DEFLATE);
+			$nbt->readCompressed($data);
 
 			$chunk = $nbt->getData();
 
diff --git a/src/pocketmine/level/generator/Generator.php b/src/pocketmine/level/generator/Generator.php
index 401890484..c29c5d5cb 100644
--- a/src/pocketmine/level/generator/Generator.php
+++ b/src/pocketmine/level/generator/Generator.php
@@ -233,17 +233,17 @@ abstract class Generator{
 		return $noiseArray;
 	}
 
-	public abstract function __construct(array $settings = []);
+	abstract public function __construct(array $settings = []);
 
-	public abstract function init(ChunkManager $level, Random $random);
+	abstract public function init(ChunkManager $level, Random $random);
 
-	public abstract function generateChunk($chunkX, $chunkZ);
+	abstract public function generateChunk($chunkX, $chunkZ);
 
-	public abstract function populateChunk($chunkX, $chunkZ);
+	abstract public function populateChunk($chunkX, $chunkZ);
 
-	public abstract function getSettings();
+	abstract public function getSettings();
 
-	public abstract function getName();
+	abstract public function getName();
 
-	public abstract function getSpawn();
+	abstract public function getSpawn();
 }
diff --git a/src/pocketmine/level/generator/biome/Biome.php b/src/pocketmine/level/generator/biome/Biome.php
index 17ee242e0..599de0334 100644
--- a/src/pocketmine/level/generator/biome/Biome.php
+++ b/src/pocketmine/level/generator/biome/Biome.php
@@ -137,7 +137,7 @@ abstract class Biome{
 		return $this->id;
 	}
 
-	public abstract function getName();
+	abstract public function getName();
 
 	public function getMinElevation(){
 		return $this->minElevation;
diff --git a/src/pocketmine/level/generator/populator/Populator.php b/src/pocketmine/level/generator/populator/Populator.php
index 7eab9fde8..e089a0098 100644
--- a/src/pocketmine/level/generator/populator/Populator.php
+++ b/src/pocketmine/level/generator/populator/Populator.php
@@ -28,5 +28,5 @@ use pocketmine\level\ChunkManager;
 use pocketmine\utils\Random;
 
 abstract class Populator{
-	public abstract function populate(ChunkManager $level, $chunkX, $chunkZ, Random $random);
+	abstract public function populate(ChunkManager $level, $chunkX, $chunkZ, Random $random);
 }
\ No newline at end of file
diff --git a/src/pocketmine/metadata/MetadataStore.php b/src/pocketmine/metadata/MetadataStore.php
index 586b648af..9cb66dacd 100644
--- a/src/pocketmine/metadata/MetadataStore.php
+++ b/src/pocketmine/metadata/MetadataStore.php
@@ -136,5 +136,5 @@ abstract class MetadataStore{
 	 *
 	 * @throws \InvalidArgumentException
 	 */
-	public abstract function disambiguate(Metadatable $subject, $metadataKey);
+	abstract public function disambiguate(Metadatable $subject, $metadataKey);
 }
\ No newline at end of file
diff --git a/src/pocketmine/metadata/MetadataValue.php b/src/pocketmine/metadata/MetadataValue.php
index 4b927eaaf..4834003fc 100644
--- a/src/pocketmine/metadata/MetadataValue.php
+++ b/src/pocketmine/metadata/MetadataValue.php
@@ -43,11 +43,11 @@ abstract class MetadataValue{
 	 *
 	 * @return mixed
 	 */
-	public abstract function value();
+	abstract public function value();
 
 	/**
 	 * Invalidates this metadata item, forcing it to recompute when next
 	 * accessed.
 	 */
-	public abstract function invalidate();
+	abstract public function invalidate();
 }
\ No newline at end of file
diff --git a/src/pocketmine/nbt/NBT.php b/src/pocketmine/nbt/NBT.php
index 5fa2fdd3f..f929f58e3 100644
--- a/src/pocketmine/nbt/NBT.php
+++ b/src/pocketmine/nbt/NBT.php
@@ -423,11 +423,11 @@ class NBT{
 		$this->buffer = "";
 	}
 
-	public function readCompressed($buffer, $compression = ZLIB_ENCODING_GZIP){
+	public function readCompressed($buffer){
 		$this->read(zlib_decode($buffer));
 	}
 
-	public function readNetworkCompressed($buffer, $compression = ZLIB_ENCODING_GZIP){
+	public function readNetworkCompressed($buffer){
 		$this->read(zlib_decode($buffer), false, true);
 	}
 
diff --git a/src/pocketmine/nbt/tag/Tag.php b/src/pocketmine/nbt/tag/Tag.php
index 9359a5b2f..fa2d395c5 100644
--- a/src/pocketmine/nbt/tag/Tag.php
+++ b/src/pocketmine/nbt/tag/Tag.php
@@ -34,7 +34,7 @@ abstract class Tag extends \stdClass{
 		return $this->value;
 	}
 
-	public abstract function getType();
+	abstract public function getType();
 
 	public function setValue($value){
 		$this->value = $value;
diff --git a/src/pocketmine/plugin/PluginBase.php b/src/pocketmine/plugin/PluginBase.php
index 1a21698a0..d998ea5bb 100644
--- a/src/pocketmine/plugin/PluginBase.php
+++ b/src/pocketmine/plugin/PluginBase.php
@@ -72,14 +72,14 @@ abstract class PluginBase implements Plugin{
 	/**
 	 * @return bool
 	 */
-	public final function isEnabled(){
+	final public function isEnabled(){
 		return $this->isEnabled === true;
 	}
 
 	/**
 	 * @param bool $boolean
 	 */
-	public final function setEnabled($boolean = true){
+	final public function setEnabled($boolean = true){
 		if($this->isEnabled !== $boolean){
 			$this->isEnabled = $boolean;
 			if($this->isEnabled === true){
@@ -93,19 +93,19 @@ abstract class PluginBase implements Plugin{
 	/**
 	 * @return bool
 	 */
-	public final function isDisabled(){
+	final public function isDisabled(){
 		return $this->isEnabled === false;
 	}
 
-	public final function getDataFolder(){
+	final public function getDataFolder(){
 		return $this->dataFolder;
 	}
 
-	public final function getDescription(){
+	final public function getDescription(){
 		return $this->description;
 	}
 
-	public final function init(PluginLoader $loader, Server $server, PluginDescription $description, $dataFolder, $file){
+	final public function init(PluginLoader $loader, Server $server, PluginDescription $description, $dataFolder, $file){
 		if($this->initialized === false){
 			$this->initialized = true;
 			$this->loader = $loader;
@@ -128,7 +128,7 @@ abstract class PluginBase implements Plugin{
 	/**
 	 * @return bool
 	 */
-	public final function isInitialized(){
+	final public function isInitialized(){
 		return $this->initialized;
 	}
 
@@ -267,21 +267,21 @@ abstract class PluginBase implements Plugin{
 	/**
 	 * @return Server
 	 */
-	public final function getServer(){
+	final public function getServer(){
 		return $this->server;
 	}
 
 	/**
 	 * @return string
 	 */
-	public final function getName(){
+	final public function getName(){
 		return $this->description->getName();
 	}
 
 	/**
 	 * @return string
 	 */
-	public final function getFullName(){
+	final public function getFullName(){
 		return $this->description->getFullName();
 	}
 
diff --git a/src/pocketmine/scheduler/AsyncTask.php b/src/pocketmine/scheduler/AsyncTask.php
index 455d2e1f4..68491511c 100644
--- a/src/pocketmine/scheduler/AsyncTask.php
+++ b/src/pocketmine/scheduler/AsyncTask.php
@@ -161,7 +161,7 @@ abstract class AsyncTask extends Collectable{
 	 *
 	 * @return void
 	 */
-	public abstract function onRun();
+	abstract public function onRun();
 
 	/**
 	 * Actions to execute when completed (on main thread)
diff --git a/src/pocketmine/scheduler/PluginTask.php b/src/pocketmine/scheduler/PluginTask.php
index cacb732e3..645720dbf 100644
--- a/src/pocketmine/scheduler/PluginTask.php
+++ b/src/pocketmine/scheduler/PluginTask.php
@@ -41,7 +41,7 @@ abstract class PluginTask extends Task{
 	/**
 	 * @return Plugin
 	 */
-	public final function getOwner(){
+	final public function getOwner(){
 		return $this->owner;
 	}
 
diff --git a/src/pocketmine/scheduler/Task.php b/src/pocketmine/scheduler/Task.php
index cbf82a74a..fc0681914 100644
--- a/src/pocketmine/scheduler/Task.php
+++ b/src/pocketmine/scheduler/Task.php
@@ -32,14 +32,14 @@ abstract class Task{
 	/**
 	 * @return TaskHandler
 	 */
-	public final function getHandler(){
+	final public function getHandler(){
 		return $this->taskHandler;
 	}
 
 	/**
 	 * @return int
 	 */
-	public final function getTaskId(){
+	final public function getTaskId(){
 		if($this->taskHandler !== null){
 			return $this->taskHandler->getTaskId();
 		}
@@ -50,7 +50,7 @@ abstract class Task{
 	/**
 	 * @param TaskHandler $taskHandler
 	 */
-	public final function setHandler($taskHandler){
+	final public function setHandler($taskHandler){
 		if($this->taskHandler === null or $taskHandler === null){
 			$this->taskHandler = $taskHandler;
 		}
@@ -63,7 +63,7 @@ abstract class Task{
 	 *
 	 * @return void
 	 */
-	public abstract function onRun($currentTick);
+	abstract public function onRun($currentTick);
 
 	/**
 	 * Actions to execute if the Task is cancelled
diff --git a/src/pocketmine/tile/Spawnable.php b/src/pocketmine/tile/Spawnable.php
index 33048b00f..0d85b7ea3 100644
--- a/src/pocketmine/tile/Spawnable.php
+++ b/src/pocketmine/tile/Spawnable.php
@@ -75,7 +75,7 @@ abstract class Spawnable extends Tile{
 	/**
 	 * @return CompoundTag
 	 */
-	public abstract function getSpawnCompound();
+	abstract public function getSpawnCompound();
 
 	/**
 	 * Called when a player updates a block entity's NBT data
diff --git a/src/pocketmine/tile/Tile.php b/src/pocketmine/tile/Tile.php
index 6f81bbad3..a66c5f512 100644
--- a/src/pocketmine/tile/Tile.php
+++ b/src/pocketmine/tile/Tile.php
@@ -170,7 +170,7 @@ abstract class Tile extends Position{
 		return false;
 	}
 
-	public final function scheduleUpdate(){
+	final public function scheduleUpdate(){
 		$this->level->updateTiles[$this->id] = $this;
 	}