added missing function imports

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;
 

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{
 

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{