Help with $player undefined

Sorry to post so much but I have 10 family members asking for a few issues to be fixed so here goes.

I am trying to create a plugin that spawns animals and so far here is what I have

PHP:

<?php

namespace robertcc19\spawnanimals;
    use pocketmine\level\format\FullChunk;
    use pocketmine\plugin\PluginBase;
    use pocketmine\command\Command;
    use pocketmine\command\CommandSender;
    use pocketmine\command\CommandExecutor;
    use pocketmine\entity\Entity;
    use pocketmine\level\Level;
    use pocketmine\level\Position;
    use pocketmine\math\Vector3;
    use pocketmine\nbt\NBT;
    use pocketmine\nbt\tag\ByteTag;
    use pocketmine\nbt\tag\CompoundTag;
    use pocketmine\nbt\tag\DoubleTag;
    use pocketmine\nbt\tag\FloatTag;
    use pocketmine\nbt\tag\IntTag;
    use pocketmine\nbt\tag\ListTag;
    use pocketmine\nbt\tag\ShortTag;
    use pocketmine\nbt\tag\StringTag;
    use pocketmine\entity\Villager;
    use pocketmine\event\Listener;
    use pocketmine\Player;
    use pocketmine\Server;
    use pocketmine\event\player\PlayerJoinEvent;





   class AnimalSpawn extends PluginBase implements Listener
    {


        public function onCommand(CommandSender $sender, Command $command, $label, array $args)
        {


            if (strtolower($command->getName()) === "vc") {
                $nbt = new CompoundTag ("", [
                    "Pos" => new ListTag( "Pos", [
                        new DoubleTag("", $player->x),
                        new DoubleTag("", $player->y ),
                        new DoubleTag("", $player->z)
                    ]),
                    "Motion" => new ListTag ( "Motion", [
                        new DoubleTag("", 0),
                        new DoubleTag("", 0),
                        new DoubleTag("", 0)
                    ]),
                    "Rotation" => new ListTag("Rotation", [
                        new FloatTag("", 90),
                        new FloatTag("", 90)
                    ])
                ]);
                $youranimal = Entity::createEntity(Pig::NETWORK_ID, $player->chunk, $nbt);
                $youranimal->spawnToAll();

        }
            return true;


            return false;
        }
    }

?>

This came from a suggestion on a previous question, and the $player variable seems to be undefined even though I have included the player file from the pocketmine api.

 

Thanks for that, it worked
I am not getting a pig to spawn after executing command, am I missing something? do I need to set a spawn command or is $youranimal->spawnToAll(); enough?