pocketmine\entity\Entity::heal PHP Method

    public function heal($amount, EntityRegainHealthEvent $source)
    {
        $this->server->getPluginManager()->callEvent($source);
        if ($source->isCancelled()) {
            return;
        }
        $this->setHealth($this->getHealth() + $source->getAmount());
    }

 public function heal($amount, EntityRegainHealthEvent $source)
 {
     parent::heal($amount, $source);
     if ($source->isCancelled()) {
         return;
     }
     $this->attackTime = 0;
 }