diff --git a/src/pocketmine/network/mcpe/VerifyLoginTask.php b/src/pocketmine/network/mcpe/VerifyLoginTask.php
index b56f8efe8..620cdae08 100644
--- a/src/pocketmine/network/mcpe/VerifyLoginTask.php
+++ b/src/pocketmine/network/mcpe/VerifyLoginTask.php
@@ -37,6 +37,7 @@ use function openssl_verify;
 use function ord;
 use function str_split;
 use function strlen;
+use function strtr;
 use function time;
 use function wordwrap;
 use const OPENSSL_ALGO_SHA384;
diff --git a/src/pocketmine/network/mcpe/protocol/AvailableCommandsPacket.php b/src/pocketmine/network/mcpe/protocol/AvailableCommandsPacket.php
index d4ef733e9..67c2e691a 100644
--- a/src/pocketmine/network/mcpe/protocol/AvailableCommandsPacket.php
+++ b/src/pocketmine/network/mcpe/protocol/AvailableCommandsPacket.php
@@ -31,6 +31,7 @@ use pocketmine\network\mcpe\protocol\types\CommandEnum;
 use pocketmine\network\mcpe\protocol\types\CommandEnumConstraint;
 use pocketmine\network\mcpe\protocol\types\CommandParameter;
 use pocketmine\utils\BinaryDataException;
+use function array_search;
 use function count;
 use function dechex;
 
diff --git a/src/pocketmine/network/mcpe/protocol/types/LegacySkinAdapter.php b/src/pocketmine/network/mcpe/protocol/types/LegacySkinAdapter.php
index 639e1adcf..e36a9493b 100644
--- a/src/pocketmine/network/mcpe/protocol/types/LegacySkinAdapter.php
+++ b/src/pocketmine/network/mcpe/protocol/types/LegacySkinAdapter.php
@@ -27,6 +27,10 @@ use pocketmine\entity\Skin;
 
 use function is_array;
 use function is_string;
+use function json_decode;
+use function json_encode;
+use function random_bytes;
+use function str_repeat;
 
 class LegacySkinAdapter implements SkinAdapter{
 
diff --git a/src/pocketmine/network/mcpe/protocol/types/SkinImage.php b/src/pocketmine/network/mcpe/protocol/types/SkinImage.php
index 0c0dea6df..a588184db 100644
--- a/src/pocketmine/network/mcpe/protocol/types/SkinImage.php
+++ b/src/pocketmine/network/mcpe/protocol/types/SkinImage.php
@@ -22,6 +22,7 @@
 declare(strict_types=1);
 
 namespace pocketmine\network\mcpe\protocol\types;
+use function strlen;
 
 class SkinImage{