<?php declare(strict_types=1);
namespace MyTest;
/**
 * @ValueObject
 */
class MyClass {
  /**
   * @var int
   * @Setter @Getter
   */
  private $age;
  /**
   * @var int[]
   */
  private $days = [];

  public function setAge(int $age) : void
  {
    $this->age = $age;
  }

  public function getAge() : int
  {
    return $this->age;
  }

  public function addDay(int $day) : void
  {
    //...
  }

  public function removeDay(int $day) : void
  {
    // ...
  }

  /**
   * @return int[]
   */
  public function getDays() : array
  {
    // ...
  }
}