pocketmine\math\Vector2::distance PHP Method

    public function distance($x, $y = 0)
    {
        if ($x instanceof Vector2) {
            return sqrt($this->distanceSquared($x->x, $x->y));
        } else {
            return sqrt($this->distanceSquared($x, $y));
        }
    }

 public function onPlayerMove(PlayerMoveEvent $event)
 {
     $player = $event->getPlayer();
     if ($player instanceof Player) {
         if ($player->getLevel()->getName() === $this->plugin->vipLevelName) {
             if (isset($this->plugin->statueManager->npcsSpawns[$player->getName()])) {
                 return;
             }
             foreach ($this->plugin->statueManager->npcs as $xnpc) {
                 if ($xnpc instanceof StatueModel) {
                     if ($player->getLevel()->getName() === $xnpc->levelName) {
                         $statuePos = $xnpc->position;
                         $pp = new Vector2(round($player->x), round($player->z));
                         $npc = new Vector2($statuePos->x, $statuePos->z);
                         $dff = abs(round($pp->distance($npc)));
                         if ($dff < 12 || $dff == 0) {
                             $builder = new StatueBuilder($this->plugin);
                             $builder->displayStatues($player, $this->plugin->statueManager->npcs);
                             $this->plugin->statueManager->npcsSpawns[$player->getName()] = $player->getName();
                         }
                     }
                 }
             }
         }
     }
 }