Lcobucci\JWT\ValidationData::has PHP Метод

    public function has(string $name) : bool
    {
        return !empty($this->items[$name]);
    }

 /**
  * {@inheritdoc}
  */
 public function validate(ValidationData $data)
 {
     if ($data->has($this->getName())) {
         return $this->getValue() === $data->get($this->getName());
     }
     return true;
 }