diff --git a/src/CrashDump.php b/src/CrashDump.php
index 0c3de647a..5d813eb0e 100644
--- a/src/CrashDump.php
+++ b/src/CrashDump.php
@@ -23,8 +23,8 @@ declare(strict_types=1);
 
 namespace pocketmine;
 
-use pocketmine\errorhandler\ErrorTypeToStringMap;
 use Composer\InstalledVersions;
+use pocketmine\errorhandler\ErrorTypeToStringMap;
 use pocketmine\network\mcpe\protocol\ProtocolInfo;
 use pocketmine\plugin\PluginBase;
 use pocketmine\plugin\PluginManager;
diff --git a/src/world/World.php b/src/world/World.php
index a3a05d98e..eb5a6e39e 100644
--- a/src/world/World.php
+++ b/src/world/World.php
@@ -91,7 +91,6 @@ use function floor;
 use function get_class;
 use function gettype;
 use function is_a;
-use function is_array;
 use function is_object;
 use function lcg_value;
 use function max;
diff --git a/tests/phpunit/block/BrewingStandTest.php b/tests/phpunit/block/BrewingStandTest.php
index 62eb497d8..092a34ead 100644
--- a/tests/phpunit/block/BrewingStandTest.php
+++ b/tests/phpunit/block/BrewingStandTest.php
@@ -25,6 +25,7 @@ namespace pocketmine\block;
 
 use PHPUnit\Framework\TestCase;
 use pocketmine\block\utils\BrewingStandSlot;
+use function count;
 
 class BrewingStandTest extends TestCase{
 
diff --git a/tests/phpunit/plugin/ApiVersionTest.php b/tests/phpunit/plugin/ApiVersionTest.php
index c6d8d3743..ecc3a8a2b 100644
--- a/tests/phpunit/plugin/ApiVersionTest.php
+++ b/tests/phpunit/plugin/ApiVersionTest.php
@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\plugin;
 
 use PHPUnit\Framework\TestCase;
+use function sort;
 
 class ApiVersionTest extends TestCase{
 
diff --git a/tests/phpunit/utils/CloningRegistryTraitTest.php b/tests/phpunit/utils/CloningRegistryTraitTest.php
index 8151481a3..69ca0a411 100644
--- a/tests/phpunit/utils/CloningRegistryTraitTest.php
+++ b/tests/phpunit/utils/CloningRegistryTraitTest.php
@@ -24,7 +24,6 @@ declare(strict_types=1);
 namespace pocketmine\utils;
 
 use PHPUnit\Framework\TestCase;
-use pocketmine\block\VanillaBlocks;
 
 final class CloningRegistryTraitTest extends TestCase{