diff --git a/src/pocketmine/PocketMine.php b/src/pocketmine/PocketMine.php
index 5b1d820a2..cca5cb1ad 100644
--- a/src/pocketmine/PocketMine.php
+++ b/src/pocketmine/PocketMine.php
@@ -263,8 +263,8 @@ namespace pocketmine {
 
 	$errors = 0;
 
-	if(version_compare("5.5.0", PHP_VERSION) > 0){
-		$logger->critical("Use PHP >= 5.5.0");
+	if(version_compare("5.6.0", PHP_VERSION) > 0){
+		$logger->critical("You must use PHP >= 5.6");
 		++$errors;
 	}
 
diff --git a/src/pocketmine/level/format/anvil/ChunkRequestTask.php b/src/pocketmine/level/format/anvil/ChunkRequestTask.php
index cd2661f7f..1d5c8007e 100644
--- a/src/pocketmine/level/format/anvil/ChunkRequestTask.php
+++ b/src/pocketmine/level/format/anvil/ChunkRequestTask.php
@@ -100,9 +100,7 @@ class ChunkRequestTask extends AsyncTask{
 			}
 		}
 
-		$biomeColors = $this->biomeColors;
-		array_unshift($biomeColors, "N*");
-		$biomeColors = call_user_func_array("pack", $biomeColors);
+		$biomeColors = pack("N*", ...$this->biomeColors);
 
 		$ordered = zlib_encode(Binary::writeLInt($this->chunkX) . Binary::writeLInt($this->chunkZ) . $orderedIds . $orderedData . $orderedSkyLight . $orderedLight . $this->biomeIds . $biomeColors . $this->tiles, ZLIB_ENCODING_DEFLATE, $this->compressionLevel);
 
diff --git a/src/pocketmine/level/format/mcregion/McRegion.php b/src/pocketmine/level/format/mcregion/McRegion.php
index 5e6a4e19f..5cca7ba47 100644
--- a/src/pocketmine/level/format/mcregion/McRegion.php
+++ b/src/pocketmine/level/format/mcregion/McRegion.php
@@ -122,9 +122,7 @@ class McRegion extends BaseLevelProvider{
 			}
 		}
 
-		$biomeColors = $chunk->getBiomeColorArray();
-		array_unshift($biomeColors, "N*");
-		$biomeColors = call_user_func_array("pack", $biomeColors);
+		$biomeColors = pack("N*", ...$chunk->getBiomeColorArray());
 
 		$ordered = zlib_encode(
 			Binary::writeLInt($x) . Binary::writeLInt($z) .
diff --git a/src/pocketmine/nbt/tag/IntArray.php b/src/pocketmine/nbt/tag/IntArray.php
index b79b904fe..ad39c148b 100644
--- a/src/pocketmine/nbt/tag/IntArray.php
+++ b/src/pocketmine/nbt/tag/IntArray.php
@@ -37,8 +37,6 @@ class IntArray extends NamedTag{
 
 	public function write(NBT $nbt){
 		$nbt->putInt(count($this->value));
-		$ints = $this->value;
-		array_unshift($ints, $nbt->endianness === NBT::LITTLE_ENDIAN ? "V*" : "N*");
-		$nbt->put(call_user_func_array("pack", $ints));
+		$nbt->put(pack($nbt->endianness === NBT::LITTLE_ENDIAN ? "V*" : "N*", ...$this->value));
 	}
 }
\ No newline at end of file
diff --git a/src/pocketmine/plugin/MethodEventExecutor.php b/src/pocketmine/plugin/MethodEventExecutor.php
index 43137db8e..a47239572 100644
--- a/src/pocketmine/plugin/MethodEventExecutor.php
+++ b/src/pocketmine/plugin/MethodEventExecutor.php
@@ -33,7 +33,7 @@ class MethodEventExecutor implements EventExecutor{
 	}
 
 	public function execute(Listener $listener, Event $event){
-		call_user_func(array($listener, $this->method), $event);
+		$listener->{$this->getMethod()}($event);
 	}
 
 	public function getMethod(){